ORGANISATION EUROPÉENNE POUR LA RECHERCHE NUCLÉAIRE
CERN EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH
//
I-NIM'.K r MKNTS AT CERH IN L l> N
1 ''S S ORGANISATION EUROPÉENNE POUR LA RECHERCHE NUCLÉAIRE CERN EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH
0: 8512090081
EXPERIMENTS AT CERN IN 1985
GENEVA November 1985 INTRODUCTION
I/This book is a compilation of the current experimental program at CERN. { The experiments listed are being performed at one of the following machines: the Super Proton Synchrotron (SPS), the Proton Synchrotron (PS) and the Synchro-Cyclotron (SC). The four experiments to be done by means of the Large Electron Positron machine (LEP) are also listed.
•Ttlgnro gramme has been determined—by- the-€€-RN~ -Rea^ageh—Bea-gd-y-whéch the Director^GenetaJL^on^ experiments to be carried out at CERN. The Research Board acts on recommènaarr±o»-^ma4e_by the Experiments Committees which are _the_._S£SC-, the " PSCC and the LEPC. The compb"Sttioa .-0.fL4.he Exper- ~~iTfi5n¥«—Goamit-fcees and- of the Research Board as of 1st -November$
The schematic layouts of beams and experiments at the various machines are given in the beginning of the report.
ri fry a fnrfp wh^cfr includes-A-gar-laA- number and- chacacter*.-dônoting--the- machine used- and its location.—~£n•—addi-rtorr;—a •tnaaonic dgscripJ-laa-of Its. physics. ,pjUXpj3.a&->hA&--be«n--«dded--(tyn:Iy fut active- in the hope of—faeil-itating its idontifica-tion.
The experiment goals and methods are briefly described and a schematic layout of the apparatus is included. Lists of participants and their institutions are also given. The status of the experiments (preparation, data-taking, completed) corresponds to the situation as of 1st November, 1985. "Completed" means only that data-taking is finished, not necessarily the analysis of the results; this status is kept for two years and then the experiment is removed from the catalogue. A complete list of all exper- iments published in this book since 1975 is given at the end of the cata- logue. J Notice that the above information is provided by the experimental teams, \s updated by them once a year and is given under their responsi- bility. ^In particular, it should be stressed that this catalogue is not an official CERN document. The Minutes of the Research Board and of the Experiments Committees are the appropriate official documents.
Full credit for collecting, editing and typing the material goes to Liliane Braize; she may be contacted for further information or for comments and corrections.
j (i c \ Massimiliano Ferro-Luzzi ' n, ' Secretary of the Research Board
iii CONTENTS
INTRODUCTION iii Table 1. Membership of Research Board 1 Table 2. Membership of SPSC 2 Table 3. Membership of PSCC 3 Table 4. Membership of LEPC 4 List of SPS Beams North Area 5 West Area 6 Neutrino Facility 6 Layout of SPS Experimental Areas West Area 7 North Area 8 PP 9 List of PS Beams 10 Layout of PS Experimental Areas South Area 11 East Area 12 Layout of SC Beams 13 Current Experiments Listed in this Book 14 Status of the SPS Programme 25 Status of the PS Programme 143 Status of the SC Programme 193 Status of the LEP Programme 259 List of all experiments approved since 1975 279
iv Table 1
Membership of Research Board
CERN H. Schopper (Chairman) Directorate G. Brianti I. Butterworth R.F. Heyn R. Klapisch £. Picasso
Chairmen of P.G. Hansen (PSCC) (until 30/6/85) Experiments Committees H.J. Specht (PSCC) (since 1/7/85) L. Foà (SPSC) G. Wolf (LEPC)
Division Leaders of B. de Raad (SPS) Research & Accelerator B. Hyams (EP) Divisions H. Wenninger (EF) R. Billinge (PS) M. Jacob (TH) P. Zanella (DD) G. Plass (LEP)
Outside Members S. Kullander (Gustaf Werner Inst. Uppsala University) J. Lefrançois (LAL, Orsay)
Board Secretary Massimiliano Ferro-Luzzi
Staff Association Observer H. Haseroth
The following Physics and Technical Co-ordinators are present during dis- cussion of the relevant agenda points:
Physics Co-ordinators Technical Co-ordinators
U. Gastaldi (PS) D.J. Simon (PS) B. Jonson (SC) (until 30/6/85) B. Allardyce (SC) H.J. Kluge (SC) (since 1/7/85) W. Kienzle (SPS) N. Doble (SPS) J. Wotschack (SPS) (Deputy Co-ordinator) Table 2
Membership of Super Proton Synchrotron Committee (1985) (SPSC)
L. Foa (Chairman) R. Bud de (Secretary)
Members
J.J. Aubert P. Bloch M. Bourquin P.L. Braccini A.J. Buras P. Giromini W. Hoogland R. Klanner V. Luth N. McCubbin G. Myatt F. Richard A. Staude G. Veneziano
Ex officio Members
G. Brianti I. Butterworth B. de Raad N. Doble B. Hyams R. Klapisch H. Schopper H. Wenninger W. Kienzle (SPS Co-ordinator) Table 3
Membership of Proton Synchrotron and Synchro-Cyclotron Committee (1985) (PSCC)
P.G. Hansen (Chairman) (until 30/6/85) H.J. Specht (since 1/7/85) M. Fidecaro (Secretary)
Members
C. Bucci D. Bugg F. Close C. Guyot B. Jonson E. Pauli N.J. Pirner S-M. Polikanov L.M. Simons C. Thibault E. Uggerhi^j
Ex officio Members
B. Allardyce R. Billinge B. Uyams R. Klapisch G. Le Dallic G.L. Munday H. Schopper D.J. Simon SIN Representative (M. Locher) U. Gastaldi (PS Co-ordinator) B. Jonson (SC Co-ordinator) (until 30/6/85) H.J. Kluge (ISOLDE Chairman) + SC Co-ordinator (since 1/7/85) Table 4
Membership of LEP Experiments Committee (1985) (LEPC)
G. Wolf (Chairman) H.F. Hoffmann (Secretary)
Members
A. Astbury (until 30/6/85) J.E. Augustin U. Becker A. Carter M. Delia Negra J. Ellis V.G. Goggi R. Peccei L. Roland! J. Rushbrooke W. Schmidt-Parzefall P. Strolin R. Taylor W. Willis
Ex officio Members
F. Bonaudi I. Butterworth B. Hyams E. Picasso G. Plass H. Schopper H. Wenninger LIST OF SPS BEAMS
1A. BEAMS IN THE NORTH AREA (Situation for 1986)
Beam Maximum 12 Intensity of beam for 10 name momentum Beam type incident protons at 450 GeV/c (GeV/c)
9 107 T& at 200 GeV/c high energy hadron or H2 450 3 107 it" at 200 GeV/c electron beam (also 4 106 e± at 150 GeV/c used as test beam) ; heavy ion beam
5 11 K4 450 ~10 K£ decays for 10 inc. p Alternate K°/K° beam Li D ~102 K§ 107
H6 250 1 108 7i+ at 150 GeV/c Medium energy hadron 4 107 ir~ at 150 GeV/c beam (also used as test beam)
Attenuated primary p ~106 p at 450 GeV/c or high energy hadron H8 450 2 108 n+ at 200 GeV/c (e) beam; heavy ion 7 107 vT at 200 GeV/c beam
M2 280 2.5 107 \x+ at 200 GeV/c high intensity 8 106 \T at 200 GeV/c muon beam
high intensity pri- mary p beam for pro- PO 450 ~1013 p at 450 GeV/c duction of E12 beam; transport of hadrons or heavy ions to H10 beam
H10 450 ~ 1 107 7t+ at 200 GeV/c High energy hadron ~ 3 106 7i- at 200 GeV/c or p beam; heavy ion beam
E12 300 1.5 108 e" total with Broad-band electron/ energy > 100 GeV photon beam LIST OF SPS BEAMS
IB. BEAMS IN THE WEST AREA (Situation for 1986)
Beam Maximum Intensity of beam for 1012 name momentum incident protons at 450 GeV/c Beam type (GeV/c)
HI 450 4 106 je" at 350 GeV/c hadron, electron 2 108 t& at 200 GeV/c or attenuated 1.5 106 e at 200 GeV/c proton beam
H3 450 3.6 106 %~ at 350 GeV/c hadron, electron 1.8 108 it* at 200 GeV/c or attenuated 1.2 106 e at 200 GeV/c proton beam; heavy ion beam
XI 70 102 - 104 tertiaries / test beam, 107 incident H3 particles tertiary electrons + hadrons
X3 50 102 - 104 tertiaries / test beam, 107 incident H3 particles tertiary elections + hadrons
X^ 100 102 - 10** tertiaries / test beam, 107 incident H3 particles tertiary electrons + hadrons
X7 ' 100 102 - 104 tertiaries / test beam, 107 incident H3 particles tertiary electrons + hadrons
2. BEAMS IN THE WEST AREA NEUTRINO FACILITY
10 2 Nl k50 GeV ~30 5.3 * 10 v/m ~0.25 ev/ton Wide band 10 2 protons 2.3 * 10 v/m ~O.O25 ev/ton spectrum up to 450 GeV/c 2 5
ce < LU H2 HALL EHN1 TARGET ZONE :K4 (see detail)
HALL ECN3 NA38 20 15 to S 0 SO 100 150 200 250m HALL EHN2 SPS NORTH EXPERIMENTAL AREA GENERAL LAYOUT NA4 NA37
DETAIL OF HALL EHN1 10 2C 30 40 SO SPS LAYOUT OF pp EXPERIMENTS
CERN PREVESSIN SITE
PROTON INJECTION
ANTl.PROTON EXP. 1 UA 4 UA7 INJECTION UA5/1
CERN MEYRIN SITE INTERNAL GAS JET TARGET ; EXP. UA6
vO LSSS LIST OF PS BEAMS (as on 1.10.85)
I. East Area (primary beam)
Beam Ejection Momentum Particles/magnet cycle Remarks GeV/c
SE 62 8.-24. p: 2xlOn primary beam split in 2 branches (for test beams)
II. East Area (counter beams)
Beam Ejection Momentum Particles and flux/cycle1 Remarks
+ + - - SE 62 l.-10.GeV/c p,n ,e or n ,e production angle: 0 degree (South branch) beam height 1.28 m e+ IX of + beam (5 GeV/c) •\-50Z of + beam (2 GeV/c)
SE 62 <_ 10. GeV/c n~ 10 GeV/c * 105 production angle: 0 degree (North branch) e" = 1-3* *> beam height 2.28 m
pos. beam = AxlO5
SE 62 < 5. GeV/c n" 5 GeV/c = 3xlO5 production angle: 3,53 degrees (North branch) e" « 10% *) beam height 2.5 m pos. beam = 6*105
< 3.5 GeV/c -] 1 SE 62 (North branch) iT 3.5 CeV/c = 2xlO5 production angle: 8,55 degrees e~ < 10Z *> beam height 2.5 m pos. beam = 4xlO5 *) The percentage of e~ in the negative beam is depending on the external target used (converter).
III. South Area (LEAR design values)
Beam Ejection Momentum Particles and flux Remarks
6 LEAR external ultra-slow 0.2-1.5 GeV/c p: < 10 /s long spill of <^ 3 x 109 p beam -1 hour 0.1-2.0 GeV/c still under development
p beam splits into 3 branches (6 experimental areas) CERN PS South Area
(1985)
LEAR AND EXPERIMENTAL AREAS
O SPLITTER MAGNETS
1 ISOLDE PROTON HALL NEUTRON HALL
EXTRACTED /LSI ^ TUNNEL j . __ BEAM / ^ Je:. ISOLDE LJ1 UNDERGROUND 4 3,1 ZONE SC MACHINE 'CJ1 HALL
INTERNAL MUON TARGETS \ t 'CJ2 O 1 t 3 4i
I I /YJ1 SC BEAM LAYOUT i r CURRENT EXPERIMENTS LISTED IN THIS BOOK
EXPT. No. TITLE AND COLLABORATION Page
SPS PROGRAMME
WAI High-Energy Neutrino Interactions 27
CERN-Dortmund-Heidelberg-Saclay-Warsaw
2 WAI/2 Measurement of sin 0w in Semileptonic vFe Interactions with High 29 Precision
CERN-Dortmund-Heidelberg-Saclay-Warsaw
WA18 Study of Semileptonic and Leptonic Neutral-Current Processes and of 31 ^.-polarization Using Counter Techniques
CERN-Hamburg-Amsterdam-Rome-Moscow
WA18/2 High Precision Measurement of the Ratio av(NC)/av(CC) 33
CERN-Hamburg-Amsterdam-Rome-Moscow
WA21 High-Energy v and v Interactions in BEBC Filled with H2 35
Birmingham-Bonn-CERN-London-Munich-Oxford
WA25 Neutrino and Antineutrino Interactions in Deuterium 37
Amsterdam-Bergen-Bologna-Padova-Pisa-Saclay-Torino
WA38 Magnetic Monopole Search at the SPS 39
Bologna-CERN-Moscow-Novosibirsk-Serpukhov
WA44 Search for Quarks in High-Energy Neutrino Interactions 41
Bologna-CERN-Frascati-Rome
WA69 Photoproduction in the Energy Range 70-200 GeV 43
Bonn-CERN-Erevan-Lancaster-Manchester-Rutherford Lab.-Sheffield
WA70 Study of Direct Photon Events in Hadronic Collisions 45
Geneva-Glasgow-Liverpool-Milan-Neuchatel
WA71 An Experiment to Study Beauty Production and Lifetime in the 47 Upgraded Q' Spectrometer
CERN-Genova-Milan-Moscow-Paris-Rome-Santander-Valencia
1 - EXPT. No. TITLE AND COLLABORATION Page
WA75 An Experiment to Observe Directly Beauty Particles Selected by 49 Muonic Decay in Emulsion & to Estimate their Lifetimes
Bari-Brussels-CERN-Dublin-Japan-London(UC)-Rome-Torino
WA76 Study of the Mesons Produced Centrally in the Reaction pp -»• pp + X° 51 and iCp •> n~n + X° at 340 GeV
Athens-Bari-Birmingham-CERN-Paris
WA77 Search for Direct Production of Gluonium States in High pT TC~N 53 Collisions at 350 GeV/c
Athens-Bari-Birmingham-CERN-Paris
WA78 Search for the Hadroproduction of BB Pairs 55
Bari-Brussels-CERN-London-Rome-Torino
WA79 Study of Neutrino-Electron Scattering at the SPS 57
Brussels-CERN-Hamburg-Louvain-Moscow-Munich-Naples-Rome
WA80 Study of Relativistic Nucleus-nucleus Collisions at the CERN SPS 59
Darmstadt-LBL-Lund-Marburg-Munster-Oak Ridge Nat. Lab.-Warsaw
WA81 Measurements of Pair Production under Channelling Conditions by 61 70-180 GeV Photons Incident on Single Crystals
Aarhus-CERN-Strasbourg
NA1 Measurement of the Photoproduction of Vector and Scalar Bosons 63
Frascati-Milan-Pisa-Torino-Trieste-Westfield College
NA2 Electromagnetic Interactions of Muons 65
Aachen-Annecy-CERN-Freiburg-Hamburg-Heidelberg-Lancaster-Liverpool- Marseille-Mons-Oxford-Rutherford Lab.-Sheffield-Torino-Uppsala- Warsaw- Wuppertal-Yale
NA3 Direct Photon Production in Hadron-Hadron Collision at the SPS 69
CERN-Orsay-Palaiseau-Paris-Pisa-Saclay
NA4 Inclusive Deep Inelastic Muon Scattering 71
Bologna-CERN-Dubna-Munich-Saclay
15 EXPT. No. TITLE AND COLLABORATION Page
NA9 Study of Final States in Deep Inelastic Muon Scattering 73
Aachen-Annecy-CERN-Freiburg-Hamburg-KIel-Lancaster-Liverpool- Marseille-Mons-Munich-Orsay-Oxford-Rutherford Lab.-Sheffield-Torino- Uppsala-Wuppertal
NA10 High Resolution Study of the Inclusive Production of Massive Muon 77 Pairs by Intense Pion Beams
CERN-Naples-Palaiseau-Strasbourg-Zurich
NA12 Study of it~p Interactions with Neutral Final States 79
Annecy-Belgium-Los Alamos-Serpukhov
NA14 Photoproduction at High Energy and High Intensity 81
Athens-CERN-London-Orsay-Palaiseau-Paris-Saclay-Southampton- Strasbourg-Warsaw
NA14/2 A Program of Heavy Flavour Photoproduction 83
Athens-CERN-London-Orsay-Paris-Saclay-Southampton- Strasbourg-Warsaw
NA20 Measurements of it*, K1, p1 Yields in 400 GeV Proton Beryllium and 85 Copper Collisions
Experimental Area Group and Neutrino Beam Users
NA24 Investigation of Deep Inelastic Scattering Processes Involving Large 87 PT Direct Photons in the Final State
Bari-Freiburg-Moscow-Munich
± ± NA27 An Experiment to measure Accurately the Lifetime of the D°»D ,F ,AC 89 Charm Particles and to Study their Hadronic Production and Decay Properties
Aachen-Brussels-Bombay-CERN-Duke-Genova-Japan-Liverpool-Madrid-Mons- Oxford-Padova-Paris-Rome-Rutgers-Rutherford-Serpukhov-Stockholm- Strasbourg-Tenneesee-Torino-Trieste-Vienna-Zeuthen
NA28 Study of Shadowing and Hadron Production in High Energy u Scattering 93 Using Nuclear Targets
Aachen-Annecy-CERN-Frelburg-Hamburg-Kiel-Lancaster-Liverpool-Mar seille-Mons-Munich-Orsay-Oxford-Rutherford Lab.-Sheffield-Torino- Uppsala-Wuppertal
NA30 Precision Determination of the Lifetime of the Neutral Pion 97
Ames Lab.-CERN-Chicago-Lund-Paris
16 EXPT. No. TITLE AND COLLABORATION Page
2 2 NA31 Measurement of the |T)OO | /JTH_| 99
CERN-Dortmund-Edinburgh-Orsay-Pisa-Siegen
NA32 Investigation of Chant Production in Hadronic Interactions Using 101 High-Resolution Silicon Detectors
Amsterdam-Bristol-CERN-Cracow-Munich-Rutherford Lab.-Santander- Valencia
NA33 Experimental Study of Single Vertex (e~-e+) Pair Creation in a 103 Crystal
Albany (SUNY)-Annecy (LAPP)-Frascati-Lyon
NA34 Lepton Production 105
BNL-CERN-Heidelberg-London (Birbeck College+UCL)-Los Alamos-Lund- Montreal (McGill+Univ)-Moscow (Lebedev+EPI)-Novosibirsk-Pittsburgh- tfutherford Lab.-Saclay-Stockholm-Tel Aviv
NA34/2 Study of High Energy Densities over Extended Nuclear Volumes via 109 Nucleus-Nucleus Collisions at the SPS
BNL-CERN-Heidelberg-Los Alamos-Lund-Montreal (McGill+Univ)-Moscow (Lebedev+EPI)- Novosibirsk-Pittsburg-Saclay-Stockholm-Tel Aviv
NA35 Study of Relativistic Nucleus-nucleus Collisions 111
Athens-Bari-Cracow-CERN-Darmstadt-Frankfurt-Freiburg-Heidelberg-LBL- Marburg-Texas- Warsaw-Zagreb
NA36 Production of Strange Baryons and Antibaryons in Relativistic Ion 113 Collisions
Athens-Bergen-Birmingham-BNL-Carnegie Mellon-CERN-Punjab Univ-City College of NY-Cracow-LBL-Strasbourg-Vienna
NA37 Detailed Measurements of Structure Functions from Nucléons and Nuclei 115
Bielefeld-Freiburg-Heidelberg-Indiana Univ.-Mainz-Mons-Neuchatel- Oxford-UC Santa Cruz-SIN-Torino-Uppsala-Warsaw-Wuppertal
NA38 Study of High Energy Nucleus-Nucleus Interactions with the Enlarged 117 NA10 Dimuon Spectrometer
Bergen-CERN-Clermont Ferrand-Lisbon-Lyon-Neuchatel-Orsay-Palaiseau- Strasbourg-Valencia
17 EXPT. No. TITLE AND COLLABORATION Page
ANTIPROTON-PROTON COLLIDER PROGRAMME
UA1 A 4it Solid Angle Detector for the SPS Used as a pp Collider at cm. 119 Energy of 630 GeV
Aachen-Amsterdam-Annecy-Birmingham-CERN-Harvard-Helsinki-Kiel-London Padova-Paris-Riverside-Rome-Rutherford Lab.-Saclay-Vienna-Wisconsin
UA2 Study of pp Interactions at 540 GeV cm. Energy 123
Bern-Cambridge-CERN-Copenhagen-Heidelberg-Milan-Orsay-Pavia-Perugia- Pisa-Saclay
UA3 Search for Magnetic Monopoles at the pp Colliding Ring 125
Annecy-CERN
UA4 Measurement of Elastic Scattering in the Coulomb Interference Region 127 at the CERN pp Collider
Amsterdam-CERN-Genova-Naples-Palaiseau-Pisa
UA5/2 An Exploratory Investigation of pp Interaction at 800-900 GeV cm 129 Energy at the SPS Collider
Bonn-Brussels-Cambridge-CERN-Stockholm
UA6 An Internal Hydrogen Jet Target in the SPS to Study Inclusive 131 Electromagnetic Final States at Large Transverse Momentum and A Production in pp and pp Interactions at /s = 24.3 GeV
CERN-Lausanne-Michigan-Rockefeller
UA7 Measurement by Silicon Shower Detectors of the Invariant Cross 133 Section of nQ Emitted Close to Zero Degree
Japan U.G.-Naples
UA8 Study of Jet Structue in High Mass Diffraction at the SPS Collider 135
U.C.L.A.
EMU01 Study of Particle Production and Nuclear Fragmentation in Collisions 137 of 160 Beams with Emulsion Nuclei at 13-200 A GeV
Beijing-Jaipur-Jammu-LBL-Lund-Ottawa (Nat. Res. Council+Univ.)-Shanxi Tashkent-Washington Univ.-Wuhan
EMU02 Search for Fractionally Charged Nuclei in High-Energy Oxygen-Lead 139 Collisions
U.C. Berkeley-CERN EXPT. No. TITLE AND COLLABORATION Page
EMU03 Interactions of 16O Projectile and its Fragmentation in Nuclear 141 Emulsion at about 50 and 225 GeV/nucleon
Cairo University
PS PROGRAMME
PS169 Search for Neutrino Oscillations 145
CERN-Dortmund-Heidelberg-Saclay
PS170 Precision Measurements of the Proton Electromagnetic Form Factors in 147 the Time-like Region and Vector Meson Spectroscopy
Ferrara-Padova-(CEN) Saclay (DPhN+DPhPE)-Torino
PS171 Study of pp Interactions at Rest in a H2 Gas Target at LEAR 149
CERN-Mainz-Munich-Orsay-Vancouver-Victoria-Vienna-Zurich
PS172 pp Total Cross-sections and Spin Effects in pp -> K+K~, ii+"nr,pp above 151 200 MeV/c
Amsterdam-Geneva-London-Surrey-Trieste
PS173 Measurement of pp Cross-sections at Low p Momenta 153
Heidelberg (MPI+Univ.)-Laval-Mainz-Rutgers Univ.
PS174 Precision Survey of X-Rays from pp (pd) Atoms Using the Initial LEAR 155 Beam
Amsterdam-Birmingham-Delft-Rutherford Lab.-William & Mary College
PS175 Measurement of the Antiprotonic Lyman- and Balmer X-Rays of pH & pD 157 Atoms at Very Low Target Pressures
Karlsruhe (Kernforschungszentrum+Univ.)
PS176 Study of X-Ray and yRay Spectra from Antiprotonic Atoms at the 159 Slowly Extracted Antiproton Beam of LEAR
Basel-Karlsruhe-Stockholm-Strasbourg-Thessaloniki
PS177 A Search for Heavy Hypernuclei at LEAR 161
Amsterdam-CERN-Darmstadt-Grenoble-Orsay-Saclay-Uppsala-Warsaw
PS178 Study of Antineutron Production at LEAR 163
Cagliari-Padova-Torino
1') EXPT. No. TITLE AND COLLABORATION Page
PS179 Study of the Interaction of Low-Energy Antiprotons with H2, He3, 165 He1*, Ne-Nuclei Using a Streamer Chamber in Magnetic Field
Bergen-Brescia-Dubna-Frascati-Padova-Pavia-Torino
PS180 Search for Neutrino Oscillations at CERN PS Using BEBC 167
Athens-Padova-Pisa-Wisconsin
PS181 Contribution of the CHARM Collaboration to the CERN Neutrino 169 Oscillation Program
CERN-Hamburg-Amsterdam-Rome-Moscow
PS182 Investigations on Baryonium & Other Rare pp Annihilation Modes Using 171 High-resolution n° Spectrometers
Basel-Stockholm-Thessaloniki
PS183 Search for Bound NN States Using a Precision Gamma and Charged Pion 173 Spectrometer at LEAR
Athens-Irvine-Karlsruhe-New Mexico-Pennsylvania-Strasbourg
PS184 Study of p-nucleus Interactions with a High Resolution Magnetic 175 Spectrometer
Grenoble-Saclay-Strasbourg-Tel Aviv
PS 185 Study of Threshold Production of pp •*• YY at LEAR 177
Carnegie Mellon-Erlangen-Freiburg-Illinois Univ. at Champaign-JUlich- Rice Univ.-Saclay-Uppsala- Vienna
PS186 Nuclear Excitations by Antiprotons and Antiprotonic Atoms 179
Munich (Technical University)
PS187 A Good Statistics Study of Antiproton Interactions with Nuclei 181
Los Alamos-Gienoble
PS188 Measurements of Channelling Radiation and its Polarization, X-Ray 183 Excitation, together with Deviations from Landau Distributions
Aarhus-CERN-St rasbourg
PSJ.89 High Precision Mass Measurements with a Radiofrequency Mass Spectro- 185 meter - Application to the Measurement of the pp Mass Difference
CERN-Orsay
20 EXPT. No. TITLE AND COLLABORATION Page
PS191 Search for Decays of Heavy Neutrinos with the PS Beam 187
Athens-CERN-Paris
PS194 Measurements of the Ratio Between Double and Single Ionization of 189 Helium for Antiprotons
Aarhus-CE RN-St ockholm
PS195 Tests of CP Violation with K° and K° at LEAR
Athens-Basel-CERN-Fribourg-Liverpool-Saclay-SIN-Stockholm-Tessaloniki 191 Z\xr Ich
SC PROGRAMME
SC65 Local Magnetic Fields in Ferromagnetics Studied by Positive Muon 195 Precession
CERN-Grenoble-Uppsala
SC68 Muonic Chemistry in Condensed Matter 197 Parma University
SC76 Impurity Trapping of Positive Muons in Metals 199
CERN-Geneva-Jlilich-Uppsala
SC81 Formation and Interaction of Muonium in Insulators & Semiconductors 201
Parma-Rutherford Lab.
SC82 uSR in Organic & Free Radical Chemistry 203
CERN-Parma-Ruhterford Lab.
SC83 Study of the Particle Production in 12C Induced Heavy Ion Reactions 205 at 86 MeV/N
Bergen-Copenhagen-Grenoble-Lund-Saclay
SC85 Element Distribution and Multiplicity of Heavy Fragments 207
Darmstadt-Heidelberg-Mun8ter
SC86 Study of Nuclear Collisions of 86 MeV/a.m.u. 12C with Heavy Targets 209 by Collection of the Heavy Recoil Nuclei
Bordeaux Gradignan (CEN)
21 EXPT. No. TITLE AND COLLABORATION Page
SC87 Study of Target Fragmentation in the Interaction of 86 MeV/A i2C 211 with Ta, B and U
Berkeley-Oregon-Studvi sk
SC88 Study of Reaction Mechanism in the Interaction 86 MeV/A 12C with 213 Heavy Targets
Grenoble-Lyon
SC92 Subthreshold Production of Neutral Pions in Heavy Ion Collisions 215
Darmstadt-Frankfurt
SC93 nSR-Measurements under High Pressure and at Low Temperatures 217
Grenoble-Munich-Uppsala
SC95 Muons and Muonium in Molecular Physics 219
CERN-Leicester-Rutherford Lab.
SC96 600 MeV Simulation of the Production of Cosmogenic Nuclides in 221 Meteorites by Galactic Protons
Ahmedabad-Bordeaux-Cologne-Jlilich-Mainz-Zurich
ISOLDE Isolde Programme 223
Aarhus-Atlanta-Bergen-UC Berkeley-Berlin (HMI+FU+TU)-Bombay-Bonn-Caen Chalk River Nucl. Lab.-Copenhagen (Niels Bohr Inst.)- Daresbury- Darmstadt-Gent-Giessen-Gb'teborg-Grenoble-Groningen-Jiilich (KFA)- Kassel-Konstanz-Lisbon-Louvain-Lyon-Madrid-Mainz-McMaster Univ-McGill Univ-Munster-New York-Orsay (IPN+CSNSM+Aimé Cotton)-0slo-0xford- Paris (IN2P3)-Princeton-Sacavem-Simon Fraser Univ-Saclay-Strasbourg- Stockholm-Studvisk-Warsaw-Zurich-CERN/ISOLDE
IS10 Determination of the Electron Neutrino Mass from Experiments on 229 Electron-Capture Beta-Decay (EC)
Aarhus-CERN-ISOLDE-Lund-Roskilde (Tandem Accelerator)
IS20 Mossbauer Studies of Implanted Impurities in Solids 231
Aarhus-Groningen-ISOLDE
IS30 PAC Experiments at ISOLDE 233
Berlin (HMI+FU+TU)-ISOLDE
IS40 Atomic-Beam Magnetic Resonance Experiments at ISOLDE 235
Gbteborg-ISOLDE EXPT. No. TITLE AND COLLABORATION Page
IS50 Spectroscopic Studies of Exotic Nuclei at ISOLDE 237
Lyon-Madrid-Paris-Strasbourg-ISOLDE
IS60 Continuation of Mass Determinations through a Double Focusing Mass 239 Spectrometer on Line with ISOLDE
Orsay-ISOLDE
IS70 Continuation of Atomic Spectroscopy on Alkali Isotopes at ISOLDE 241
Orsay (CSNSM+Aimé Cotton)-ISOLDE
1580 Study of Nuclear Moments and Mean Square Charge Radii by Collinear 243 Fast-Beam Laser Spectroscopy
Mainz-Bombay-CERN-GQteborg-New York Univ.-ISOLDE
1581 Laser Spectroscopy at Z = 50 245
CERN-Darmstadt-Mainz-ISOLDE
1582 Multiphoton Ionization Detection in Collinear Laser Spectroscopy of 247 Isolde Beams
CERN-Mainz-Troitzk-ISOLDE
IS90 Study of the Doubly-closed Shell Nucleus 132Sn and its Valence 249 Nuclei
Bergen-CERN-ISOLDE-Darmstadt-Gb"teborg-Julich-Kingston Queens Univ.- Stockholm
IS100 Studies of Stable Octupole Deformations in the Radium Region 251
Bergen-CERN-Chalmers-Mainz-Warsaw-ISOLDE
IS110 Nuclear Orientation Studies and Measurements of Magnetic Moments of 253 Radon Isotopes
CERN-Kingston-Mainz-Princeton Univ.-Zurich-ISOLDE
IS120 Nuclear Implantation into Cold On Line Equipment (NICOLE) 255
Bonn-CERN-Daresbury Lab.-Delft-Gent-Louvain-Lyon-Munich-Orsay-Oxford- Paris-Strasbourg-ISOLDE
IS130 High-Precision Direct Mass Determination of Unstable Isotopes 257
CERN-Mainz-McGill Univ.-ISOLDE
23 EXPT. No. TITLE AND COLLABORATION Page
LEP PROGRAMME
ALEPH The ALEPH Detector 261
Athens-Bari-Beijing-CERN-Clermont Ferrand-Copenhagen-Dortmund- Edinburgh-Florida State Univ.-Frascati-Glasgow-Heidelberg-Innsbruck- Lancaster-London- Marseille-Munich-Orsay-Palaiseau-Pisa-Royal Holloway College-Rutherford Lab.-Saclay-Sheffield-Siegen-Trieste- Wisconsin
OPAL OPAL Collaboration LEP 265
Birmingham-Bologna-Bonn-Cambridge-Carleton-CERN-Chicago-Freiburg- Heidelberg-Israel-London (Birbeck+QMC+UC)-Manchester-Maryland- Ottawa-Rehovot (Weizmann Inst.)-Rutherford Lab.-Saclay-Tel Aviv- Tokyo
L3 L3 Experiment 269
Aachen (I+III)-Amsterdam-Annecy-Beijing-Bombay-Budapest-CALTEC- Carnegie Mellon Univ.-CERN-EIR-Florence-Frascati-Geneva-Harvard- Hawaii-Hofei-John Hopkins Univ.-Lausanne-Lund-Lyon-Madrid-Michigan- M.I.T.-Moscow-Naples-Northeastern-Ohio State Univ.-Oklahoma Univ.- Princeton-Rome-Siegen-Yale-Zeuthen-Zurich
DELPHI DELPHI 275
Ames Lab.-Amsterdam-Athens (Demokritos+Univ.+Nat.Tech.Univ.)-Belgium Bergen- Bologna-CERN-Copenhagen-Cracow-Dubna-Genova-Helsinki-Karls ruhe-Liverpool-Lund-Milan-Orsay-Oslo-Oxford-Padova-Paris (Col. de France+LPNHE)-Rome (Sanità)-Rutherford Lab.-Saclay-Santander- Serpukhov- Stockholm-Strasbourg-Torino-Trieste-Uppsala-Valencia- Vienna- Warsaw- Wuppertal S PS
STATUS OF THE SPS PROGRAMME AS OF NOVEMBER 1985
25 182HoL'i I I I I
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Hi8h.Energy ions WAI
Beam N1/N3 Approved 17/APR/1974 03/DEC/1975 15/FEB/1979 17/MAY/1979 Status Completed 22/DEC/1983
High - Energy Neutrino Interactions
CERN, Dortmund Univ., Heidelberg Univ., Saclay CEN DPhPE, Warsaw InstJWucIJies. CERN Dydak F. Hagelberg R. Krasny M. May J. Para A. Ranjard F. Steinberger J. Taureg H. Von Rueden W. Wachsmuth H. Wahl H. Wotschack J. Dortmund Univ. Rluemer H. Brummel H. Buchholz P. Duda J. Eisele F. Kampschulte B. Kleinknecht K. Knobloch J. Pollmann D. Pszola B. Renk B. Heidelberg Univ. Belusevic R. .7alkenburg B. Fiedler M. Geiges R. Geweniger C. Hepp V. Keilwerlh H. Tittel K. Saclay CEK DPhPE Debu P. Guyot C. Merlo J.P. Para A. Perez P. Perrier F. Rander J. Schuller J.P. Turlay R. Vallage B. Warsaw lnst.Nud.Res. Abramowicz H. Krolikowski J. Lipniacka A. Spokesman: Steinberger, J. Contactman: Steinberger, J.
This experiment studies neutrino interactions in iron at the highest available energies using the narrow — band neutrino beam N3 and the wide — band neutrino beam N1. The basis of the detector is a massive target — calorimeter in which the energy deposited by a neutrino (or antineutrino) is measured by electronic techniques and the momentum of outgoing muons is determined by magnetic deflection.
The detector is constructed in the form of a 20 m long iron — cored toroidal magnet, composed of modules of length 70 cm and 90 cm, and of 3.75 m diameter. Drift chambers placed in between each module measure the trajectory of muons from the neutrino interactions. The modules are of three types. The first ten modules are constructed of 2.5 cm iron plates with 20 scintillator planes inserted between the plates. The next five modules are constructed of 5 cm plates with 15 planes of scintillator and the last six modules are constructed of 15 cm plates with 5 planes of scintillators. The total mass of the detector is =* 1400 tons.
Another aim of the experiment is to compare charged — current neutrino interactions in H2 with those originating in iron, using the wide-band neutrino beam Nl.
The physicsi aims of this experiment are : a) to study inclusive neutrino reactions in iron, b) to study rare processes, in particular multilepton production, c) to compare neutrino interactions in hydrogen and iron.
References SPSC/P73-1. P73-1/ADD.1, M/73-11, 74-6/P l/Add.2, 74-20/M 17, 74-24/M 19, 74-38/M 25, 75-33/P 1/ADD.3, 75-81/M53, 77-104/M97, 78-7/M105, 78-32/P100, 78-60/M 108, 78-108/M134, 7S-157/MI45, 79-34/Ml60Rev., 79-32/M159. 79-134/M213, 80-43/M233, 80-68/P 149, 80-114/M264, SPSC/81-76/M299, SPSC/81-85/M30S, SPSC/82-69/M343. SPSC/83-40/M3S7, SPSC/83 -42/M358 27 .,..-...., U : M± ÎT^iw* crnr WAI/2
Beam N3 Approved 15/SEP/1983 Status Completed 30/AUG/1984
Measurement of sin2© in Semileptonic vFe Interactions witliHigh Precision
CERN, Dortmund Univ., Heidelberg Univ., Saclay CEN DPKPE, Warsaw InstJVuclJtes. CERN Boeckmann P. Blondel A. Burkhardt H. Dydak F. Grant A. Hagelberg R. Hughes E. Krasay M. May J. Para A. Ranjard F. Steinberger J. Taureg H. Von Rueden W. Wachsmuth H.W. Wotschack J. Dortmund Univ. Bluemer H. Brummel H. Buchholz P. Duda J. Kampschulte B. Kleinknecht K. Knobloch J. Pollmann D. Renk B. Heidelberg Univ. Belusevic R. Falkenburg B. Fiedler M. Geiges R. Geweniger C. Hepp V. Keilwerth H. Kurz N. Tittel K. Saclay CEN DPhPE Debu P. Guyot C. Merlo J.P. Perez P. Perrier F. Rander J. Schuller J.P. Turlay R. Vallage B. Warsaw Inst.Nucl.Res. Abramowicz H. Krolikowski J. Lipniacka A. Spokesman: Dydak, F. Contactman: Dydak, F.
This experiment aims at a determination of the electroweak mixing angle sin26 with an experimental precision of + 0.005. The mixing angle is derived from a measurement of the neutral— to charged — curre^ i ratio in neutrino—iron scattering.
The beam is a high—flux version of the N3 narrow—band beam, operated at 160 GeV/c parent momentum. The apparatus is the same as for experiment WAI.
References SPSQS3 -49/P188. SPSC/83 - 84/M369 29
WAI 8
Beam N1/N3 Approved 08/JUL/1976 Status Completed DEC/1983
Study of Semileptonic and Leptonic Neutral — Current Processes and of fi - polarization Using Counter Techniques
CERN, Hamburg Univ., Amsterdam NIKHEF, Rome Univ./INFN, Moscow I.TJZJ». CERN AllabyJ.V. Amaldi U. Baubillier M. Flegel W. Lanceri L. MetcalfM. Nieuwenhuis C. Pain R. Panman J. Santoni C. Winter K. Hamburg Univ. Abt I. Aspiazu G. Busser F.W. Daumann H. Gall P.D. Hebbeker T. Niebergall F. Schutt P. Stahelin P. Amsterdam NIKHEF Bergsma F. Rome, INFN Barbiellini G. Baroncelli A. Barone L. Borgia B. Bosio C. Capone A. Diemoz M. De Notaristefani F. Dore U. Ferroni F. Longo E. Luminari L. Monacelli P. Tortora L. Valente V. Moscow I.T.E.P. Gorbunov P. Grigoriev E.A. Kaftanov V.S. Khovansky V.D. Rosanov A. Spokesman: Winter, K. Contactman: Winter, K.
This experiment will study semileptonic neutral current neutrino interactions with nucléons, using principally the dichromatic neutrino beam N1 and will make measurements of the polarization of muons produced in the WAI experiment by neutrino — nucléon interactions, using the horn —focused broad — band neutrino beam. The main part of the apparatus is a fine — grained target calorimeter in which the energy and direction of the hadronic jet resulting from the neutrino scattering is measured by electronic techniques. It is supplemented by a muon detector and spectrometer. The fine-grained calorimeter is used as a polarimeter for muons produced in WAI. The calorimeter is composed of 13 modules, each 1.2 m long and 4 m x 4 m in cross section. A module consists of six 3 m x 3 m target plates made of 8 cm thick marble with 12 cm gaps for insertion of 20 scintillation counters of 15 cm width and 3 cm thickness, 128 proportional counters of 3 x 3 cm2 cross — section and 4 m length, and 256 streamer tubes of 0.9 x 0.9 cm2 cross — section and 2.5 m length with wires oriented at 90° with respect to the proportional counters. Each target plate is surrounded by a magnetized iron frame of 45 cm width and 8 cm thickness. The calorimeter is backed up by a coarse — grained magnetized iron calorimeter at the rear end of it. The vertex of neutrino scattering is measured with the help of the proportional counters and the streamer tubes. The energy and direction of hadrons is measured by pulse —height analysis of the scintillators. The energy and direction of the scattered neutrino can thus be determined by energy and momentum balance with the incoming dichromatic neutrino beam. Muons produced and analysed in the WAI set —up are stopped in the fine —grained calorimeter and their polarization is measured by observing their decay asymmetry. The main physics aims of this experiment are : a) Study of inclusive semileptonic neutral current neutrino interactions with nucléons. b) Measurement of polarization of n + produced in antineutrino interactions in Fe. c) Measurement of the cross section of muon neutrino and antineutrino scattering on electrons. d) Search for new particles.
References SPSC/74-1/I 58; 75-59/P 49, 76-S1/P 49/Add.l; 76 - 114/M70, 77-45/P 49/Add.2; 78 -72/M 114, 78-111/M 137,79-25/M IS4. 79-43/M 16S + Corr.; 79-64/M 180, 79-89/M192. 79-109/M201, 8O-12/M217, 80-102 VI 261, SPSC81-99/M308, SPSC/81 -85/M305, SPSC/81 -99/M308/Corr., SPSC/82-65/M339, SPSC83 26M352. SPSO83- 33/M355, SPSC/83 -39/M356. SPSC/83 -82/M367 11 FIRST OF 3 END MAGNETS
TARGET CALORIMETER ENO CALORIMETER LAST 12 PLANES OF 78
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PROPORTIONAL TUBES
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STREAMER TUBES COIL
IRON FRAME
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13 modules of the target - calorimeter Muon spectrometer 15600 20870
Experiment WA18/2: High Precision Measurement of the Ratio o (NC)/a (CC) WA18/2
Beam N3 Approved 02/FEB/1984 Status Completed
03/SEP/1984
High Precision measurement of the Ratio a^NQ/a^CC)
CERN, Hamburg Univ., Amsterdam N1KHEF, Rome Univ./INFN, Moscow LT£JP. CERN AJJaby J.V. Amaldi U. Baubillier M. Flegel W. Grancagnolo F. Lanceri L. Metcalf M. Nieuwenhuis C. Panman J. Plunkett R. Santoni C. Winter K. Hamburg Untv. Abt I. Aspiazu J. Busser F.W. Daumam. H. Gall P.D. Hebbeker T. Niebergall F. Schutt P. Stahelin P. Amsterdam NJKHEF Bergsma F. Rome Unlv./INFN Barbielliiii G. Bar once lli A. Barone L. Borgia B. Bosio C. Capone A. Diemoz M. Dionisi C. Dore U. Ferroni F. Longo E. Loverre P. Luminari L. Monacelli P. Morganti S. De Notaristefani F. Tortora L. Valente V. Moscow l.T.E.P. Gorbunov P. Grigoriev E.A. Khovansky V. Rosanov A. Spokesman: Winter, K. Contactman: Winter, K. The experiment aims at a high precision measurement of the ratio of References SPSC/84-1/P194 33 WA2I Beam NI Approved 26/AUG/1976 Status Completed DEC/1983 High Energy v and v Interactions in BEBC Filled with H2 Birmingham Vim., Bonn Univ., CERN, London, Imperial College, London, University College, Munich MPI, Oxford Univ. Birmingham Univ. Jolley D.C. Jones G.T. O'Neale S.W. Votruba F. Bonn Univ. Boeckmann K. Gebel W. Geich - Gimbel C. Kokoti T.P.K. Nellen B. CERN Butterworlh I. Grant A. Mittendorfer J. Morrison D.R.O. Pape L. Parker A. Peyrou C. Schmio P. Simopoulou E. Wachsmuth H.W. London, Imperial College Barnham K.W.J. Clayton E.F. Miller D.B. Mobayyen M. Villa - Lobos - Baillie O. London, University College Bartley J.H. Bullock F.W. Esten M. Miller D.J. Munich MPI Aderholz M. Deck L. Schmitz N. Settles R. Wernhard K.L. Wittek W. Oxford Univ. Corrigan G. Myatt G. Radojicic D. Spokesman: Myatt, G. Contactman: Morrison, D.R.O. This experiment is a high statistics exposure of BEBC filled with hydrogen to both v and v beams. The principal physics aims are : a) The study of the production of charmed mesons and baryons using fully constrained events. b) The study of neutral current interactions on the free proton. c) Measurement of the cross — sections for production of exclusive final state N* and A resonances. d) Studies of hadronic final states in charged and neutral current reactions. e) Measurement of inclusive charged current cross — sections and structure functions. The neutrino flux is determined by monitoring the flux of muons in the neutrino shield. The Internal Picket Fence and External Muon Identifier of BEBC are essential parts of the experiment. High resolution cameras are used to search for visible decays of short - lived particles. References SPSCI73-28. SPSC/I 73-40, SPSC/74-91/P 25, SPSC/75-66/M52, 77-94/M93, 76-U1/M69, 78-143/M143, 79-51/M172, 79-91/M194, 80-69/M239, 80-73/M242, SPSC/81 -8S/M305, SPSC/83 -32/M3S4, SPSC/83-53/M360, SPSC;83 - 71 /M363. SPSC/83 - 72/M364 35 WA25 Beam NI Approved 26/AUG/1976 Status Completed DEC/1983 Neutrino and Antineutrino Interactions in Deuterium Amsterdam NIKHEF, Bergen Univ., Bologna Univ., Padova Univ., Pisa Univ./INFN, Saclay CEN DPhPE, Torino Univ. Amsterdam NIKHEF Barlag S. Jongejans B. Tenner A. Van Apeldoorn C. Van Dam P. Visser C. Wigmans M. Bergen Univ. Frodesen A.G. Haatuft A. Halsteinslid A. Grung B. Myklebost K. Rognebakke A. Skjeggestad O. Time R. Bologna Univ. Capiluppi P. Giacomelli G. Graziani G. Mandrioli G. Rossi A.M. Serra Lugaresi P. Padova Univ. Baldo-Ceolin M. Bobisut F. Calimani E. Ciampolillo S. Derkaoui J. Huzita H. Loreti M. Puglierin G. SconzaA. Pisa Unlv.jINFN Angelini C. Bertanza L. Bigi A. Casali R. Fantechi R. Flaminio E. Nappi A. Pazzi R. Petri C. Pierazzini G.M. Saclay CEN DPhPE BologneseT. Borg A. Faccini - Turluer M.L. Louedec C. Vignaud D. Torino Univ. Allasia D. Bianchi F. Bisi V. Gamba D. Marzari-Chiesa A. Riccati L. Romero A. Spokesman: Tenner, A. This experiment uses BEBC filled with deuterium and exposed to the wide —band neutrino beam Nl. The use of deuterium as the target material allows to study interactions on both neutrons and protons. The charge of the target nucléon can be inferred from the number of positive and negative particles in the final state. Some of the physics aims of this experiment are to measure separately the cross sections a and a on neutrons and protons to determine the structure functions Fn(x,Qz) and FP(x,Q2), the fragmentation functions D(z,Q2) and the ratio of neutral to charged current interactions. Additional problems under investigation are the production of nucléon isobars, and of resonances in general, the production of strange and of charmed particles, and the problems of deuterium structure. References SPSC/I 73-56. 74-09/1 56/AD D.I, 74-72/P 16, 74-105/P 16/ADD.l, 76-05/P I6/ADD.2, 77-93/M92, 78-78/M117. 79-50/M171. 79-93/M19S, 79-103/M197, 80-2<5/M 225, SPSC/81-45/M 292, SPSC/81-62/M 295. SPSC/82 - 18/M319, SPSC/83 - 56/M361 37 275 LD O -}. Experiment NA38: Magnetic Monopole Search at the SPS WA38 Beam N3 Approved 16/JUN/1977 Status Completed DEC/1983 Magnetic Monopole Search at the SPS Bologna Univ., CERN, Moscow Khurckatov Inst., Novosibirsk InstJVuclJPhys., Serpukhov UIJEJ*. Bologna Univ. Giacomelli G. CERN Lazeyras P. Moscow Khurchatov Inst. Gurevich I.I. Khakimov S.Kh. Martemianov V.P. Mishakora A.P. Ogurtzov V.V. Tarasenkov V.G. Novosibirsk lnst.Nucl.Phys. Barkov J.M. Serpukhov l.H.E.P. Bugorski A.P. Spokesman: Martemianov, V.P. Contactman: Lazeyras, P. A target made of fine grains of tungsten — iron powder will be exposed to the 400 GeV proton beam in front of the narrow —band neutrino beam dump. Magnetic monopoles if produced by the proton interactions will be trapped in the target. After exposure, the target will be placed in the centre of a pulse magnetic coil with nuclear emulsions acting as monopole detectors. A monopole mass sensitivity up to 18 GeV is expected in this experiment. References SPSC/77-37/P85, 80-129/SPSC/M 270 39 ELEVATION HODOSCOPES Low *% trigger AVALANCHE CHAMBER fi. RANGE CALIBRATION ST2 STI1 V2 Wl AC 235 TARGET Mognet J vo S2 si VI', V3'V3 Fe .VI RI V21 456.39 23* Leod /xBeam 4000 4000 =65-70 = 9-12 454.25 985 * 1980 • -1720- * 2350- * 2300- PLAN ,6743 - 4055 ^2401 + 1- -I520H -3520- -5740 "5872 -7805" 0 12m Experiment WA44: Search for Quarks in High-Energy Neutrino Interactions WA44 Beam NI Approved 08/DEC/1977 Status Completed DEC/1983 Search for Quarks in High- Energy Neutrino Interactions Bologna Univ., Bologna INFN, CERN, Frascati NatXab. (JNFN), Rome Univ.lINFN Bologna Univ. Basile M. D'Ali G. Palmonari P. Sartorelli G. Bologna INFN Bonvicini G. Cara Romeo G. Del Papa C. Giusti P. Massam T. CERN Cifarelli L. Contin A. Nania R. Rohrbach F. Zichichi A. Frascati Nat.Lab. (INFN) Curatolo M. Esposito B. Spinetti M. Susinno G. Votano L. Rome Unlv./INFN Laakso I. Spokesman: Zichichi, A. Contactman: Massam, T. This experiment is a search for quarks produced in high energy neutrino interactions. Neutrino interactions take place in a 23—ton lead target and are recognized by one or more particles crossing the counter hodoscopes SI and S2, together with the absence of an incident particle signal in the initial veto counter Vo. The lead is viewed by an avalanche chamber to measure the specific ionization of the charged secondaries produced in the v—interaction with high accuracy even in jet —like events, and by a series of two pairs of scintillation counter hodoscopes (ST1, ST2). The latter provide time—of—flight measurements and dE/dx measurements for a fast analysis in low and medium multiplicity events and provide a trigger for the chamber. In order to reduce the background in the set —up, very low momentum particles (mainly due to cascading processes in the target) are separated out by a =; 1 T.m magnet placed behind the target. A system of wire chambers Wl, W2, which register both the position and the time at which they have been hit by a particle, allows track reconstruction to check against edge effects in the scintillation counters. A system of iron absorbers and scintillation counters is used to trigger muons at different y values in the relativistic rise to calibrate the ionization measurement in the avalanche chamber. The experimental set-up is designed to achieve high detection efficiency for quarks and high background rejection. For 5 x 10s SPS bursts of 1013 ppp the sensitivity for fractional charge events is such that one quark event corresponds to a production probability of 10"6 per neutrino interaction. References SPSC/77-10/P81. 77-73/P81/ADD.1. 80 - 130/SPSC/M 271. SPSC/81-108/M314 41 • V Experiment WA69: Photoproduction in the Energy Range 70-200 GeV OMEGA/PHOTON WA69 Beam El Approved 23/APR/1981 17/JUN/1982 06/JUN/1985 Status Data—Taking Photoproduction in the Energy Range 70 - 200 GeV Bonn Univ., CERN, Erevan PhysJnst., Lancaster Univ., Manchester Univ., Rutherford Appleton Lab., Sheffield Univ. Bonn Univ. Diekmann B. Gapp C. Heinloth K. Hoeger C. Holzkamp S. Jakob H-P. Jung M. Koersgen G. Oedingen R. Paul E. Rotscheidt H. Voigtiaender - Tetzner A. Weigend A.S. CERN Davenport M. Eades J. McClatchey R. Erevan Phys.Inst. Bagdassaryan L.S. Galumyan P.I. Kazaryan S.P. Oganessyan A.G. Lancaster Univ. Brodbeck T.J. Charity T. Clegg A.B. Henderson R.C.W. Keemer N.R. Newton D. O'Connor A. Wilson G.W. Manchester Univ. Coyle P. Barberis D. Dickinson B. Donnachie A. Doyle A.T. Ellison R.J. Hughes - Jones R.E. Ibbotson M. Kolya S.D. LafTeny G.D. McCann H. Mercer D. Ottewell P.J. Reid D. Thompson R.J. Waterhouse J. Worsell M.F. Rutherford Appleton Lab. Apsimon R. Flower P.S. Halliwetl G. Hutton J. Morris J.A.G. Morris J.V. Paterson C.N. Sharp P.H. Uden C. Sheffield Univ. Danaher S. Galbrakh W. Thacker N.A. Thompson L. Spokesman: Paul, E. Contactman: Barberis, D. This experiment continues the photoproduction studies of WA4 and WA57 TT> to the higher energies made available by the upgrading of the West Hall. An electron beam of enei^ "'00 GeV is used to produce tagged photons in the range 65 — 180 GeV; The photon beam is incident on a 60 cm liquid hydrogen target in the Omega Spectrometer. A Ring Image Cherenkov detector provides pion/kaon separation up to 150 GeV/c. The Transition Radiation Detector extends the charged pion identification to the momentum range from about 80 GeV/c upwards. The large lead/liquid scintillator calorimeter built by the WA70 collaboration and the new lead/scintillating fibre detector (Plug) are used for the detection of the gamma rays produced by the interactions of the primary photons in the hydrogen target. The aim is to make a survey of photoproduction reactions up to photon energies of 200 GeV. The large aperture of the Omega Spectrometer will particularly enable study of fragmentation of the photon to states of high mass, up to « 9 GeV at these photon energies. For photoproduction of charm the experiment will answer questions about the dependence of the production mechanism on incident energy and on Feynman x. In photoproduction of vector mesons and of multiplion states by diffractive dissociation of the photon there is much interest in extending the studies to higher mass. In addition to these 'classical physics' studies there is the exciting prospect of observing evidence lot the point — like interaction of the photon through production of events with QCD jet structure. References SPSC/80-17/SPSC/P 140, SPSC/80-75/P 140/Add.l, SPSC/80- 137/P 140/Add.2, SPSC/80 - 18/M 218, SPSC/81 -22/M 282, SPSC/82-34/P140/Add.3, SPSC/8S - 13/P140/Add.4 .MWPC Electromagnetic calorimeter Drift chamber Experimental system three segments light output on the outside only teflon tubes lead plates Electromagnetic calorimeter geometry Experiment WA70: Study of Direct Photon Events in Hadronic Collisions OMEGA/PHOTON WA70 Beam HI Approved 22/OCT/1981 Status Data-Taking Study of Direct Photon Events in Hadronic Collisions Geneva Univ., Glasgow Univ., Liverpool Univ., Milan Umv.jlNFN, Neuchatel Uni». Geneva Untv. Donnât M. Dorsaz P.A. Fischer J. Kienzle M.N. Martin M. Mathys L. Rosselet L. Werlen M. Glasgow Univ. Jack S. Lucock R. Lynch J.G. Maxwell A. Negus P.J. Stewart D.T. Thompson A.S. Turnbull R.M. Wells J. Liverpool Univ. Booth P.S.L. CaroU L.J. Cass A.J. Edwards D.N. Jackson J.N. Kelly M. Myers J.J. Range W.H. Snow S. Milan Univ./INFN Bonesini M. Bortoletto D. Cavalli D. Cecchet G. Costa G. Galluzzi E. Gianotti F. Mandelli L. Mazzanti M. Pensotti - Rancoita S. Tamborini M. Neuchatel Univ. Bonvin E. Fluri L. Jornod A. Perrin D. CERN Perini L. Spokesman: Martin, M. Contactman: Martin, M. This experiment is studying direct photon events produced by w± and protons on protons. A fine — grained sampling electromagnetic calorimeter covering a large solid angle has been built and is used to provide a good identification of w°'s and single photons. This calorimeter is based on a technique using liquid scintiUator contained in teflon tubes. A high transverse momentum photon trigger allows a study of the direct photon cross — section. The Omega Spectrometer with its tracking capabilities is used for a detailed study of the structure of the associated hadron jets. Other channels with an electromagnetic signature are recorded as well (e.g. Références SPSC/80-61/P147, SPSC/80-108/P147/Add.l, SPSC/82-23/M322, SPSC/82-37/M327, SPSC/8S-43/M409 45 [Mi':'.I! N '. I '. ' i M h [H (WA69] un IWA7H f Ml AlORIMEHR IWA;OI J vfiilE* ot linon IWA71] [ " " C Q' MWK o _ J 1 - 9 l'jin Experiment WA71: An Experiment to Study Beauty Production and Lifetime in the Upgraded .Q1 Spectrometer OMEGA/BEAUTY WA71 Beam HI Approved 22/OCT/1981 Status Data—Taking An Experiment to Study Beauty Production and Lifetime in the Upgraded 9/ Spectrometer CERN, Genova Unh.jINFN, Milan Univ.llNFN, Moscow Lebedev PhysJnst., Paris VI and VII Univ., Rome Univ.llNFN, Santander Univ., Valencia Univ. CERN Darbo G. Garcia J. Higon E. Rossi L. Vanderhaeghe G. Genova Univ.llNFN Dameri M. Osculali B. Sannino M. Tomasini G. Vitale S. Milan Univ.jINFN Manfredi P.F. Marioli D. Meroni C. Micheletli S. Vegni G. Moscow Lebedev Phys.lnst. Adamovich M.I. AJexandrov Y.A. Chernyavsky M.M. Gerasimov S.G. Larionova V.G. Menjelai - Peresadko N.G. Orlova G.I. Salmanova N.A. Shtarkov L.N. Tretyakova M.I. Vnukova M.V. Paris VI and VII Univ. Cloarec M.M. Levy F. Lory J. Schune D. Tsai Chu Willot B. Rome Univ.llNFN Baroni G. Diambrini - Palazzi G. Ginobbi P. Lamanna E. .Mazzoni M.A. Meddi F. PetreraS. Santander Univ. Niembro R. Ruiz A. Villar E. Valencia Univ. Bolta J.M. Cabrera J. Llosa R. Sanchis M.A. Senent F. Geneva Univ. Tentindo S. Spokesman: Diambrini — Palazzi, G The aim of this experiment is to detect Beauty particles decaying in nuclear emulsion and to measure their lifetime. The principle of the experiment is to discriminate the interactions producing Beauty particles from the general background of hadronic interactions by looking at the dominant decay mode B -• C + X whose branching ratio is expected to be larger than 50%. A special charm decay detector consisting in two multilayer silicon telescopes has been designed and successfully tested in a 85 GeV/c hadron beam. This device allows the detection of a decay taking place in the gap between the two telescopes by measuring the variation in charged particle multiplicity from the first to the second one. This measurement is used at the trigger level or in off— line analysis. A vertex detector, consisting in three doublets of silicon-microstrip detectors with a pitch of 50 fim and two small time — projection chambers, is placed between the charm decay detector and the Q.' spectrometer. Its purpose is to improve the reconstruction of primary vertices and possibly to detect some secondary vertices. The localisation accuracy of the primary interaction vertex is futher improved by the use of a silicon — microstrip beam hodoscope. The experiment will be performed in the upgraded W spectrometer using a 350 GeV/c -n~ beam to produce 2 x 108 interactions in 50 litres of nuclear emulsion. These 50 litres will be subdivised in small stacks of a few 600 micron thick pellicles to be exposed perpendicular to the beam and moved transversally during the bursts in order to optimize the track and interaction density in the emulsion. 7Tie expected number of detectable Beauty events is from 10 to 20; each event should be found amongst some 3000 candidates. In addition, a total of about 800 charmed particle decays would be observable in emulsion and reconstructed by the spectrometer. References SPSC 81 - 18 P IS'J. 5PSC81 -32/P 159/Add. 1, SPSC/81 -47/P 159/Add. 2, SPSC/81 - 39/M289, SPSC/81 -56//M293. SPSCS1 64 M 296, SPSC 82 13.M3P, SPSC/82 - 36A1326, SPSC 83 - 19M350, SPSC 83 18 M349, SPSC 84 21 M374 4 7 Magnet Dump fe fe Fe — 3ecPi nit ml :] •* I H nfl • • -] 1 1 i 1 1 1 11 12 GENERAL LAYOUT Experiment WA75: An Experiment to Observe Directly Beauty Particles Selected by Muonic Decay in Emulsion & to Estimate their Lifetimes WA75 Beam H3 Approved 22/APR/1982 Status Completed 18/JUN/1984 An Experiment to Observe Directly Beauty Particles Selected by Muonic Decay in Emulsion & to Estimate their Lifetimes Ban Univ., Brussels, I1HE, CERN, Dublin Univ. College, Japan U.G., London, University College, Rome Univ., Torino Univ. Bari Univ. Armenise N. Erriquez O. Muciaccia M.T. Natali S. Nuzzo S. Romano F. Ruggieri F. Brussels. 1IHE Baith M. Bertrand- Coremans G. Roosen R. CERN Chesi E. Musset P. Piuz F. Poulard G. Rosa G. Sletten H. Dublin Untv. College Breslin A. Montwill A. Japan U.G. Hazama M. Hoshino K. Isogane Y. Maeda Y. Miyanishi M. Nakamura M. Niu K. Niwa K. Ohashi M. Sato Y. Shibuya H. TsuneokaY. Ushida N. YamakawaO. Yanagisawa Y. London, University College BartleyJ.H. Davis D.H. DuffB.G. Esten M.J. Heymann F.F. Imrie D.C. Lush G.J. Tovee D.N. Rome Univ. Baroni G. Dell'Uomo S. De Vincenzi M. Di Liberto S. Frenkel A. Manfredini A. Marini G. Martellotti G. Nigro A. Penso G. Petrolo E. Pistilli P. Romano G. Sciubba A. Sgarbi G. Torino Untv. Allasia D. Bisi V. Gamba D. Marzari-Chiesa A. Ramello L. Riccati L. Romero A. Marseille C.P.P.M. Albanese J.P. Strasbourg Univ. Arnold R. London, Birkbeck College Coupland M. Trent P. Spokesman: Romano, G. Contactman: Poulard, G. A hybrid experiment to observe directly particles with open beauty and estimate their lifetimes is proposed. The experiment will take place inair" beam at 360 GeV/c. Events of the type >T~N •• BBX will be produced in a thick emulsion, allowing for a lifetime range of 1O~1S — 10"12s. The decay vertices of B and B and of the subsequent charm decays will be identified in emulsion. The precise location of the production vertex will be measured by high precision (50/tm pitch) silicon microstrip detectors. A set of planes of such detectors will be placed in front of the target to measure the incoming beam particle, and another set of planes, together with 16 planes of MWPC's will be placed behind the target to measure the secondaries. The semi—leptonic decays of B's and C's are used to create a selective trigger. The data taking will be triggered by kt with an angle to the beam a > 30 mrad, or by > 2ft. Transverse momentum cuts will be applied off— line. The muons are identified and momenta measured behind a 2m iron dump equipped with a tungsten core. This measurement will be done by deflection measurement in a 3 Tm magnet surrounded by S drift chambers, and by 9 planes of 1 mm MWPC's in the central region. The last part of the data will be taken with the dump replaced by the WA78 calorimeter. The emulsion will be scanned using the recently developped automatized technique. A volume of 60 litres of emulsion will provide a sensitivity of the order of 1.5 BB pairs per nanobam cross—section. References SPSC/81-69/P166, SPSC/82-60/M338 49 H3 SEAM FORWARD PARTICLE -(- CALORIMETER 6m Experiment WA76: Study of the Mesons Produced Centrally in the Reaction pp -> pp + X° and TT~P -> ÏÏ p + X at 340 GeV OMEGA/GLUEBALL WA76 (Ext) Beam H1A Approved 22/APR/1982 15/NOV/1984 Status Preparation Study of the Mesons Produced Centrally in the Reaction PP - PP + X° and irp - T7"p + X° at 340 GeV/c Athens Univ., Ban Univ., Birmingham Univ., CERN, Paris College de France Athens Univ. Apostolakis A. Slassinaki M. Vassiliadis O. Ban Univ. Evangelista E. Ghidini B. Lenti V. Navach F. Palano A. Zito G. Birmingham Univ. Bloodworth I.J. Carney J.N. Kinson J.B. Print I.C. Shaylor H.R. Villalobos Baillie O. Votiuba M.F. CERN Beusch W. French B.R. Goldschmidl - Clermont Y. Knudson K. Lassalle J.C. Quercigh E. Rossi L. Paris College de France Benayoun M. Kahane J. Leruste P. Sene R. Spokesman: Palano, A. Contactman: French, B.R. The basic aim of the experiment, similar to WA76, is to undertake a detailed study of the mesonic system (X°) produced centrally (Xp = 0) in the exclusive reactions (w~/p)p -*• (w~/p) X°p at 340 GeV/c. + + + + 0 0 + + + Many decay modes of X°, e.g. IT IT', ir ir'ir°, 2w 2ir~, 2ir 2w~iT , T1 IT IT', «°w w~, K K~, K + K-97°, K + K^TT- + ex., K+K-w + w-, K^K^, TJV, pp, etc. will be identified. A specific aim of the proposal is to see how the meson production observed at 85 GeV/c changes with energy and in so doing to search for evidence of mesons which are strongly coupled to glue. The experiment uses the OMEGA Spectrometer facility with a trigger designed to enhance the central exclusive meson production reaction over the difiractive reactions. This is done by triggering on a forward and backward fast particle in the c.m.s. with |xp| > 0.7 and vetoing accompanying forward and backward charged particles. The momentum of the fast particle with Xp > 0.7 will be measured with fi strip detectors. The w/K/p identification of the centrally produced particles will be done, using Cerenkovs 1 and 2, in the momentum range 2.8 to 18.8 Gev/c. Triggers on events containing K± and/or Kj0 will be implemented to enrich the kaon sample. The experiment will be run using w" and p, each taking 50% of the time. References SPSC82 3 P175. SPSC/84-62/P204 HY3 HZ2 r / HY2 o o D.C. /OX MY2\ n iff r • BHY|( HI X BEAM v TA RAFT """ C2 IMITOL 1 MWPc's o o!11 i -3 12 15 m Experiment WA77: Search for Direct Production of Gluonium States in High p TT"N Collisions at 350 GeV/c OMEGA/GLUEBALL WA77 Approved 18/NOV/1982 Status Data - Taking Search for Direct Production of Gluonium States in High pT fT-N Collisions at 350 CeV/c Athens Univ., Ban Univ., Birmingham Univ., CERN, Paris College de France, Paris VI Univ. Athens Univ. Angelopoulos A. Apostolakis A. Rozaki H. Stassinaki M. Vassiliadis G. Bart Untv. Evangelist» C. Ghidini B. Lenti V. Navach F. Palano A. Zito G. Birmingham Univ. Bloodworth I.J. Carney J.N. Kinson J.B. Shaylor H.R. Votruba M.F. CERN BeuschW. Burns A. French B.R. Goldtchmidt - Clermont Y. Knudson K. Lassalle J.C. Petronzio R. Quercigh E. Paris College de France Benayoun M. Kahane J. Leruste P. Malamant A. Narjoux J.L. Sene R. Paris VI Univ. Parrie R. Sene M. Strachman Z. Zitoun R. Paris, LPNHE, P.et M.Curie Univ. Baubiilier M. Spokesman: Quercigh, E. Contactman: Zitoun, R. We propose an experiment aimed at detecting the direct production of resonances in hadronic collisions at large transverse momenta, amongst which direct production of gluonia is expected. The experiment will attempt to find resonances different from the conventional qq states; in particular it will look for the gluonium candidates observed in the radiative decay of the Rtftrtncu SPSC/«2-62/P181, SPSC/82-78/P1»]/Add.J. SPSC/85-67/M416 53 Beam Om 1 8 9 10 I '15 16 GENERAL LAYOUT Experiment WA78: Search for the Hadroproduction of BB Pairs BEAUTY WA78 Beam H3 Approved 16/JUN/1983 Status Completed 16/AUG/1985 Search for the Hadroproduction of BB Pairs Bari Univ., Brussels, IIHE, CERN, London, University College, Rome Univ.flNFN, Torino Unh.lINFN Bari Univ. Catanese G. Muciaccia M.T. Natali S. Nuzzo S. Ruggieri F. Brussels, HHE Van Homwegen M. Roosen R. CERN Carboni G. Esten M.J. Fidecaro G. Fidecaro M. Musset P. Pistilli P. Piuz F. Poulard G. Sletten H. London, University College Bartley J.H. Coupland M. Davis D.H. Duff B.G. Heymann F.F. Imrie D.C. Lush G.J. Tovee D.N. Trent P. Rome Univ.jlNFN De Vinoenzi M. Diliberto S. Frenkel A. Lamanna E. Marini G. Martelolti G. Nigro A. Penso G. Petrera S. Petrolo E. Romano G. Rosa G. Sciubba A. Torino Univ.lINFN Bisi V. Gamba D. Torino Univ. Ramello L. Torino Univ./INFN Riccati L. Genova Univ.jlNFN Crosetli G. Hamburg DES Y Gerke C. Spokesman: Pistilli, P. Contactman: Fidecaro, M. We propose an experiment to search for BB pairs produced by dumping a total of =*2 x 1012 w~ at 350 GeV/c in a target calorimeter of variable density. The sensitivity of the experiment will lie between 100 and 500 pb depending upon the BB production mechanism. The BB signal will be found among the events of the type *r~N - n±n± + X and w"N - 3(4) n + X. The requirement of at least one high p^ muon together with a large missing energy due to escaping neutrinos, strongly enhances the signal to background ratio. The background, due to the production of /i + ji~ pairs associated with a "non —prompt" muon from w and K decay, will be measured directly extrapolating the results to an infinite target density. The experiment will use the muon spectrometer developed by the WA75 collaboration for the beauty search in emulsion, equipped with a target calorimeter especially designed to perform energy measurements under high rate conditions. The high sensitivity and the independence of the result from the value of the beauty lifetime, makes the proposed experiment complementary to the beauty search currently in progress in a hybrid technique. The large number of events collected from DD production will also permit the study of D0D0 mixing and the measurement of the A - dependence of the DD cross - section. References SPSC/83-14/P185 55 TARGET CALORIMETER LOO 360 MUON SPECTROMETER L»7000 TOTAL: 552 PLANES • MODULE t 90 91 92 Ml Mi Pt Pi \" P7 DETAIL A DETAIL B Layout of the fine-grain calorimeter, composed of 552 units, and of the muon spectrometer, composed of SCINTILLATOR • LIGHT GUIDE STREAMER TUBES 2 PLANES OF STREAMER 6 toroidal iron magnets. HOR. • VERT. .TUBES WITH ANALOGUE Details A and B show the 'STRIPS I INCLINED I \ modular structure of the ANALOGUE STRIPS TARGET PLATES fine-grain calorimeter VERT.. HOR. V y CLASS and of the muon spectro- n V / S '. \ / meter, respectively. \ s i \ / t f \ / X / s */ oc // s / ^ / Vs\ //' ^ / V / V / ^ / DETAIL A S / DETA1 B 0 / S / 0 / S / V / \ / \ / 0 / AL-SUPPORT \ / ^ / \ J FOR GLASS PLATES \ / ^ / \ f • ELECTRONICS ^ / PLANE* -330- -330- -too- -700- MOOULE N MOOULE N.1 PACKAGE P, MAGNET M| Experiment WA79: Study of Neutrino-Electron Scattering at the SPS CHARM II WA79 Beam NI Approved 16/JUN/1983 Status Setting-Up Study of Neutrino - Electron Scattering at the SPS Brussels, IIHE, CERN, Hamburg Univ., Low/can Cath. Univ., Moscow I.T£JP., Munich Univ., Naples Univ.lINFN, Rome, INFN Brussels, IIHE Bertrand-CoremansG. De Winter C. Geiregat D. Villain P. Wilquet G. CERN Bergsma F. Busi C. Capone A. Delbar T. De Pedis D. Ereditato A. Regel W. Grote H. Nieuwenhuis C. Panman J. Seiden A. Winter K. Zacek V. Hamburg Univ. BaucheT. Blobel V. Busser F.W. Eckel A. Gall P.D. Gerland L. Niebergall F. Stahelin P. Louvain Cath. Univ. Favart D. Grégoire G. Mouthuy T. Moscow l.T.E.P. Gorbunov P. Grigoriev E.A. Khovansky V.D. Kubantsev M. Rosanov A. Munich Univ. Braun D. Gorini E. Lippich W. Meyer - Berkhout U. Staude A. Zupancic C. Naples Unlv./INFN Caria M. Grancagnolo F. Iasevali R. Miele G. Palladino V. Strolin P. Rome. INFN Di Capua E. Dore U. Loverre P. Piredda G. Rambaldi - Frenkel A. Santaoesaria R. Zanello D. Spokesman: Winter, K. Contactman: Flegel, W. The aim of the experiment is a measurement of the cross — section ratio of neutrino — electron and antineutrino — electron scattering in the horn—focussed wide band beam. The electroweak mixing angle can be determined in the leptonic sector by making use of the direct relation between this ratio and sinz0. The detector design is based on the principle of a fine —grain target — calorimeter followed by a muon spectrometer. The calorimeter consists of 420 units of 3.7 x 3.7 m2 surface area, each composed of a low Z target plate of 1/2X0 (marble or glass) and of a plane of streamer tubes of the Mont —Blanc experiment type with 1 cm wire spacing, read out by cathode strips of 2 cm spacing in the projection orthogonal to the wires, and digitally from the wires. The total mass of the calorimeter is 692 tons, the fiducial mass is 440 tons. The streamer tubes are used to measure the shower vertex position, the shower width (to discriminate against hadronic showers), and its direction and energy. A layer of 20 scintillators of 15 cm width and of 3 m length is inserted after every 5th unit to measure dE/dx of showers originating in a depth of one radiation length in front of it; this measurement is required to analyze the background and to monitor the flux of electron —neutrinos. A plane of streamer tubes with inclined vertical wires (±7°) is inserted every 20th module. The muon spectrometer is composed of 6 toroidal iron magnets and 9 packs of track detectors, each consisting of 3 planes of drift chambers. References SPSC/83-24/P186, SPSC/83-37/P186/Add.l, SPSC/83-83/M368, SPSC/84-29/M37S, SPSC/84-64/M385 57 WA 80 LAYOUT .30° .20° PLASTIC BALL 'BULLSEYE-TRIGGER DEI \ III HOLE ±0.3° U 0.6 x 0.6 H // ZERO-DEGREE CAL MULTIPLICITY \ ARRAY 0-9° MID-RAPIDITY CALORIMETER (~6m2) MULTIPLICITY Tl / Y DETECTOR 8-30° SPECTROMETER (1.2m2) CHARGED PARTICLE VETO DETECTOR Experiment WA80: Study of Relativistic Nucleus-Nucleus Collisions at the CERN SPS IONS/PLASTIC BALL WA80 Beam H3 Approved 03/FEB/1983 15/NOV/1984 Status Preparation Study of Relativistic Nucleus - nucleus Collisions at the CERN SPS Darmstadt GSI, Lawrence Berkeley Lab., Lund Univ., Marburg Univ., Munster Univ., Oak Ridge Nat. Lab., Warsaw Univ. Darmstadt GSI AJbrecht R. Bock R. Claesson G. Gutbrod H.H. Kolb B. Schmidt R. Schulze R. Lawrence Berkeley 1Mb. Doss M. Krisliansson P. Poskanzer A.M. Ritter H.G. Lund Univ. Garpmann S. Gustafsson H.A. Oskarsson A. Otterlund I. Persson S. Soderstrom K. Stenlund E. Munster Univ. Beckmann P. Berger F. Dragon L. Glasow R. Kampert K.H. Loehner H. PeiUmann T. Purschke M. Santo R. Wienke R. Oak Ridge Nat. Lab. Awes T. Baktash C. Beene J. Ferguson R. Gross E. Johnson J. Lee I.Y. Obenshain F. Plasii F. Young G. Sorensen S. Warsaw Univ. Siemiarczuk T. Stepaniak Y. Zielinski I. Spokesman: Gutbrod, H.H. In this experiment the physics at high energy densities will be explored. High energy densities are expected in collisions of l6O (provided from the GSI —LBL light ion source) with large target nuclei. One expectation is a phase transition into the quark gluon plasma. The experiment consists of a vertex detector, called the Plastic Ball, electromagnetic Pb —glass calorimeter, a EM — Hadron Calorimeter Wall, a multiplicity detector for charged particles and a zero degree U — calorimeter. The Plastic Ball consists of a 820 module, double dE/dx scintillator sphere covering 0, , > 30°, thus identifying protons, deuterons, tritons, alphas, etc., in the target rapidity domain. 0 < 9° are covered by a streamer tube, pad readout array (25000 pads), and by two Pb —Fe electromagnetic/hadronic fine granularity calorimeters following closely the Fabjan — Willis tower design. A 1000 —segment, GAMS type lead glass calorimeter of sufficiently small granularity to identify it0 and direct photons at E > 1 GeV covers the 40° —90° cm angles. This experiment can be triggered on high Et, high M , or on high Et photon hits in the lead glass. Overall, it determines the energy flux and E. distribution, the high Et ir° and y spectra near mid - rapidity, and the target spectator decay pattern and entropy (from the relative yields of p, d, t..), as well as multiplicity distribution and multiplicity fluctuations. References PSCC/82 - 1/P53, PSCC/82 - 9/P53/Add. 1, SPSC/85 -35/M406 59 REGION 1 68 mrad 10 mrad bend —H-H- Beam line REG 2 REG 3 Tagging system (a) The beam spectrometer Beam" (Bio) B 1 1 Goniometer Electron beam dump. (Containing radiator) HC 2 Goniometer contai- yyç 3 ning the crystal (b) The tagging system Experiment WA81: Measurements of Pair Production Under Channelling Conditions by 70-180 GeV Photons Incident on Single Crystals CHANNELLING WA81 Approved 15/NOV/1984 Status Preparation Measurements of Pair Production Under Channelling Conditions by 70 -180 GeV Photons Incident on Single Crystals Aarhus Univ., CERN, Strasbourg/CJUV. Aarhus Univ. Bale J. Moller S.P. Oades G. Peterien J.B.B. Uggerhoj B. Ostergaard K. CERN Sorensen A. StrasbourglCJl.N. Siffert P. Stiffen M. Spokesman: Uggerhoj, E. Contactman: Sorensen, A. This experiment will use the WA69 set—up to deliver a tagged photon beam in the energy range from 15 GeV to 150 GeV with a total angular spread of about ±0.5 mrad. The incident photon direction is known to about 35 /trad through the direction of the emitting electron. The photon beam is incident on an about 1 mm thick Ge single crystal in order to investigate pair production in single crystals. Above a certain energy threshold photons incident along crystal axis will show strongly increased pair production yields — the so —called Channelling Pair Production (ChPP). The produced pairs are analyzed in the ft — spectrometer. The large spread in incident photon angles offers an excellent opportunity to investigate in one single experiment the pair production in an angular region around a crystal axes and thereby compare ChPP with coherent (CPP) and incoherent (ICPP) processes. The very abrupt onset of ChPP (around threshold) will be measured and give a crucial test of the theoretical calculations. The differential ChPP spectra should — close to threshold energies — peak at half the photon energy whereas ICPP spectra are flat with a central minimum. This fact can be used as a simle method to distinguish the two processes. At higher energies ( > 100 GeV) ChPP aad CPP start to overlap and show the same differential spectra. Through different momentum and temperature dependence the two processes can be distinguished. gefcrtnets SPSC/83-80/P193. SPSC/M-63/P193/Add.l 61 VERTEX DETECTOR TARGET ! MS FS DC 5D1 DC SD2 OC SD3 DC SD4 ELEVATION Experiment NA1: Measurement of the Photoproduction of Vector and VUE EN PLAN Scalar Bosons NA1 Beam E4 Approved 12/MAR/1975 21/OCT/1976 17/JUN/1982 Status Completed 18/JUN/1984 Measurement of the Photoproduction of Vector and Scalar Bosons Frascati NatZab. (INFN), Milan Univ./INFN, Pisa Vntv./INFN, Torino Univ., Trieste Univ., London, Westfield College Frascati Nat.Lab. (1NFN) Celani F. Enorini M. Fabbri F.L. Laureili P. Satta L. SpiJJantini P. Zallo A. Milan Univ./INFN Bellini G. Bonetti S. Manfredi P.F. Menasce D. Meroni E. Moroni L. Perasso L. SalaS. Pisa Univ./INFN Amendolia S.R. Bertolucci E. Bettoni D. Bosisio L. Bradaschia C. Dell'Orso M. Foa L. Focardi E. Giazotto A. Giorgi M. Marrocchesi P.S. Menzione A. Ristori L. Scribano A. Tenchini R. Torino Univ. Beck G.A. Bilokon H. Bologna G. D'Ettorre Piazzoli B. Mannocchi G. Picchi P. Trieste Univ. Batignani G. Budinich M. Liello F. Ragusa F. Rolandi L. Stefanini A. London, Westfield College Bellamy E.H. Fidecaro F. Heath G. March P.V. Landon M. Strong J.R. Spokesman: Foa, L. Contactman: Fabbri.F.L./Bellini.G. The original programme of the experiment consisted of a detailed study of projectile fragmentation on nucléons and nuclei with particular attention to diffractive excitation. This programme of research was then specified as the measurement of coherent photoproduction on nuclei up to ^ 180 GeV with the following aims: a) photoproduction of charmed particle pairs and measurement of charmed particle lifetimes by means of an active target; b) study of the spectroscopy of the new massive particles with particular attention to the hadronic decay channels, containing charged particles and photons, and to radiative decays. The apparatus consists of a forward spectrometer for charged particles and photons and of a large angle detector which provides the topology of individual events. The spectrometer subtends a solid angle of =* 40 msr and consists of four bending magnets interspaced by sets of drift chambers, counter hodoscopes and photon detectors. The momentum resolution for charged particles is ± 0.5% almost independent of the particle momentum. Photon detectors consist of lead - scintillation counter hodoscope sandwiches [AE /E * 0.4/^/E (GeV)] or lead-glass arrays [AE /E ^ 0.14/^/E (GeV)], depending on their dimensions. The spatial resolution of these detectors is S = + 1.5 mm. The large —angle detector, consisting of proportional chambers, drift chambers and scintillation counters, measures the angle of charged particles and photons produced outside the spectrometer. Detectors around the target guarantee that events on nuclear target are of a coherent nature. The first experiment used a silicon target with 300 /im layers. The new target consists of a germanium crystal followed by a telescope of thin silicon detectors. The longitudinal development of the event is examined in steps of 100 nm in germanium and 200 — 400 jim in the telescope. References SPSC/I 73-36, 74-1S/P6, 74-23/P 6/ADD.l, 74-83/P 6/ADD.2, 76-23/P 6/ADD.3, 75-20/M47, 79-112/M203, 80-S5 H5 • S.T.A.C. TARGET ~ 4m T POLARIZED TARGET W6 W7 H4 H3h FORWARD SPECTROMETER (EUROPEAN MUON COLLABORATION) Experiment NA2: Electromagnetic Interactions of Muons EMC NA2 Beam M2 Approved 12/MAR/1975 21/OCT/1976 15/FEB/1979 Status Completed 15/AUG/1985 Electromagnetic Interactions of Muons Aachen TH, Annecy LA^J*., CERN, Freiburg Univ., Hamburg Univ., Heidelberg MPI, Lancaster Univ., Liverpool Univ., Marseille CJ\PJkf., Mons Univ., Oxford Univ., Rutherford Appleton Lab., Sheffield Univ., Torino Univ., Uppsala Univ., Warsaw Univ., Wuppertal Univ., Yale Univ. Aachen TH Berghoff G. Dueren M. Haseri. F.J. Lanske D. Schultze K. Urban Lutz Annecy L.A.P.P. Bertsch Y. Coignet G. Favier J. CERN Beaufays J.W. Grafstrom P. Niinikoski T. Osborne A.M. Rieubland J.M. Watson E. Wimpenny S. Freiburg Univ. Dreyer T. Ernst T. Haas J. Hartenthaler H. Jung H. Kabuss E.M. Kroesen G. Landgraf U. Mohr W. Rith K. Schlagboehmer A. Schroeder T. Suer H.E. Tieck E. Wallucks W. Hamburg Univ. FigielJ. Hoppe C. Janata F. Schiemann H. Studt M. de la Torre A. Heidelberg MPI von Harrach D. Kniess H. Povh B. Shibata T.A. Walcher T. Lancaster Univ. Bird I. Coughlan J. Sloan T. Liverpool Univ. Brown S. Court G.R. Gabathuler E. Garnet R. Hayman P. Holt J.R. Jones T. Marseille C.P.P.M. Aubert J.J. Benchouk C. D'Agostini G. Montanet F. Payre P. Pietrzyk B. Mons Univ. Callebaut D. Hanton J. Windmolders R. Oxford Univ. Geddes N. Gibson V. Loken J. Renton P. Taylor G. Williams W.S.C. Womerseley J. Rutherford Appleton Lab. Alner J. Bee C.P. Botterill D. Chima S. Clifïl R. Edwards M. Gray R. Norton P.R. Oakham G. Thompson J.C. Sheffield Univ. Combley F. Foster J. Salmon D. Wheeler S. Torino Untv. Arneodo M. Ferrero M.I. Guibellino P. Maselli S. Peroni C. Staiano A. Uppsala Untv. Arnidson A. Calen H. Dahlgren S. Hagberg E. Kullander S. Lettenstrom F. Lindquist T. Warsaw Univ. Badelek B. Ciborowski J. Gajewski J. Nassalski J. Rondio E. Sandacz A. Wuppertal Univ. Becks K.H. Drees J. Edwards A. Forsbach H. Hamacher K. Korzen B. Pavel N. Peschel H. Pietrzyk U. Schnieder A. Stockhausen W. Wahlen H. Yale Univ. Baum G. Caputo di Piegaia M.C. Dhawan S. Hughes V. Oppenheim R. Papavauiliou V. Piegaia R. Schueler P. Bonn Untv. Leenen M. Budapest Res. lnst. Eszes G. Jancso G. Nagy E. Ribarics P. Toth J. Urban Laszlo References SPSC/I73-15, I73-15/REV.. 74-78/P 18, 7S-62/MS1, 76-76/M59, 77-113/P 18/ADD.I, 78-112/M138, 79-17/P18/Add.2. 79-I21/M207. 80-21/M221, 80-80/M24S, SPSC/81-83/M303. SPSC/81 - 101/M309, SPSC/81 - 102/M310 65 U.C. Santa Cruz Heusch C. Spokesman: Sloan, T. Contactman: Sloan, T. This experiment was the first in a programme of physics experiments with high—energy muons using a iarge spectrometer facility. The aim of this experiment is to study the inelastic scattering of muons various targets to try to understand better the physics of virtual photon interactions over a wide range of four—momentum transfer (q2). The spectrometer includes a large aperture dipole magnet (2m x lm) of bending power =J 5 T.m and a magnetized iron filter to distinguish the scattered muons from hadrons. Drift chambers and MWPC are used before and after the magnet to detect charged products of the interaction and to allow a momentum determination of the scattered muon to an accuracy of =; 1% at 100 GeV/c, and an angular definition of ± 0.1 mrad. The triggering on scattered muons relies on three planes of scintillation counter hodoscopes before and after the magnetized iron, whose magnetic field serves to eliminate triggers from low momentum muons which are produced copiously by pion decay. The experiment uses targets of hydrogen, deuterium and heavy nuclei as well as a 2 liter volume polarized target. 67 CALORIMETERS BC H TARGET Floor 11 s 111111111111 EXPERIMENTAL LAY-OUT ( Side wiew ) Experiment NA3; Direct Photon Production in Hadron-Hadron Collision at the SPS NA3 Beam H8 Approved 12/MAR/1975 15/FEB/1979 17/MAY/1979 13/DEC/1979 27/NOV/1980 29/MAR/1984 Status Completed 03/SEP/1984 Direct Photon Production in Hadron—Hadron Collision at the SPS CERN, Orsay Linear Ace. Lab. (LAL), Palaiseau EcJ*ofy. LJ>JVHJE., Paris College de France, PisaUniv.llNFN, Saclay CEN DPhPE CERN Hansroul M. Michelini A. Rahal - Callot G. Runolfsson O. Orsay Linear Ace. Lab. (LAL) Bardadin - Otwinowska M. Boucrot J. Callot O. Cohen. M. Decamp D. Moniez M. Palaiseau Ec.Pofy. L.P.N.H.E. Badier J. Bienvenue H. Bourotte J. Karyotakis Y. Pare E. Weisz S. Paris College de France Crozon M. Delpierre P. Espigat P. Maillard J. Tilquin A. Pisa Untv./INFN Bemporad C. Cnops A.M. Costantini F. Giannini G.R. Lariccia P. Saclay CEN DPhPE Charpentier P. Detoeuf J.F. Gandois B. Le Du P. Spokesman: Michelini, A. Contactman: Michelini, A. This experiment measures the production of direct real photons with large transverse momentum in pion—nucléon collisions at the SPS (H8 beam) using the NA3 spectrometer with an upgraded e — y calorimeter. The experiment proceeds in steps of increasing complexity: a) measurement of the direct y cross — section in w±C -» y + X and search for the annihilation process qq -• yg by measuring the charge asymmetry at 200 GeV/c; b) determination of the gluon structure function of the pion and the nucléon; c) use of the w " — IT + difference on carbon, if found experimentally, to extract the gluon fragmentation from the y hadron correlations. For comparison, the quark fragmentation functions can, in principle, be extracted from processes where the Compton scattering qg -*- qy dominates and compared with data from D.I.S. as a test of the method. The existing standard NA3 spectrometer is well suited for this type of physics. However.in order to improve the direct photon selection a fine —grained shower chamber is added to the existing electron—photon calorimeter. References SPSC/74-90/P24, 77-4/M 71; 77-57/M83, 78-142/1115; 79-5/IllS/Add.l, 79-41/M164; 79-60/M177. 79-78/M188, 79-105/M199;79-ll?/M199/Ad SM3 SM4 SM5 SM6 SM7 SM8 SM9 S M 10 shielding 60 m. Experiment NA4: Inclusive Deep-Inelastic Muon Scattering MUON SC. NA4 Beam M2 Approved 07/MAY/1975 12/MAY/1977 15/FEB/1979 Status Completed 16/AUG/1985 Inclusive Deep — Inelastic Muon Scattering Bologna Univ., CERN, Dubna JJJVJl., Munich Univ., Saclay CEN DPhPE Bologna Univ. Bari G. Benvenuti A.C. Bollini D. Bruni G. Laurenti G. Monar: L. Navarria F. CERN Argento A. Sacquin.Y. Voss R. Dubna J.l.N.R. Bardin D.Yu. Cvach J. Fadeev N.G. Golutvin LA. Kazarinov M.Yu. Kiryushin Yu.T. Krivokhizhin V.G. Kukhtin V.V. Lohmann W. Nemecek S. Reimer P. Savin I.A. Smirnov G.I. Smolin D.A. StrachotaJ. Sultanov G. Todorov P. Veress I. Volodko A.G. Munich Univ. Jamnik D. Kopp R. Meyer - Berkhout U. Staude A. Teichert K.M. Tirler R. Voss R. Zupancic C. Saclay CEN DPhPE Cribier M. Feltesse J. Milstajn A. Ouraou A. Rich - Hennion P. Sacquin Y. SmadjaG. Virchaux M. Spokesman: Voss, R. Contactman: Sacquin, Y. This experiment aims at measuring inclusive deep inelastic muon scattering at high Q2 with good luminosity. The present physics program focuses on a high statistics measurement of the proton structure 2 function F2 (x,Q ) with a liquid hydrogen target. Other topics include structure function measurements with heavy nuclei, nuclear effects in deep inelastic scattering, multimuon events, and weak — electromagnetic interference. The spectrometer in its present configuration consists of a 40m long magnetized iron toroid which is subdivided in 8 separate modules. The first 6 of them contain target vessels in the central bore which can be filled with liquid hydrogen, deuterium, or nitrogen. Each module is equipped with 8 planes of MWPC which measure alternately the x and y coordinates of the scattered muons, and with two planes of liquid scintillator and one plane of plastic scintillator trigger counters. Two upstream targets in front of the spectrometer, followed by a set of MWPC with three — coordinate readout, extend the acceptance of the apparatus towards small values of Q2 and the scaling variable x. The track and the timing of the interacting beam muons are measured with a set of beam hodoscopes. An additional set of hodoscopes around the last vertical bending magnet of the beam (not shown in the figure) measures the momentum of the incoming muons. References SPSC/74-79/P 19, 74-103/P 19/ADD.l, 74-108/P 19/ADD.2, 74-120/P 19/ADD.3, 74-82/M56, 77-12/P 19/ADD.4, 77-40/M78, 79-44/M166, 79-132/M211, 80-23/M223, 80-97/M 256, SPSC/81-97/M306, SPSC/81-85/M30S, SPSC/83-27/M353, SPSC/83 -76/M36S, SPSC/84-68/M388, SPSC/85-27/M405 71 SC H2 VM PV2 PO(a) CO C1 WV3 W1 POIbl W2 FSpH '965° [If 0 1m 2m 4 m 6m VERTICAL PROJECTION H2 PV3 F4 PV2 CA Fj WV2 C, WV3 W| W2 HORIZONTAL PROJECTION Experiment NA9: Study of Final States in Deep Inelastic Muon Scattering NA9 Beam M2 Approved 16/FEB/1978 23/MAR/1979 Status Completed 20/DECyi983 Study of Final States in Deep Inelastic Muon Scattering Aachen TH, Annecy LAJ>J>., CERN, Freiburg Univ., Hamburg DESY, Hamburg Univ., Kiel Univ., Lancaster Univ., Liverpool Univ., Marseille CJ*J*M., Mons Univ., Munich MPI, Orsay Linear Ace. Lab. (LAL), Oxford Univ., Rutherford Appleton Lab., Sheffield Univ., Torino Univ., Uppsala Univ., Wuppertal Univ. Aachen TH Berghofî G. Duren M. Hasert FJ. Lanske D. Schultze K. Urban L. Annecy L-A.P.P. Bertsch Y. de Bouard X. Ccignet G. Favier J. Jancso G. Maire M. Minssieux H. Moynot M. Pessard H. Schneegans M. Thenard J.M. Vivargent M. CERN Dobinson R.W. Goessling C. Gustafsson L. Kellner G. Muller Hans R. Osborne A.M. Osborne L. Sloan T. von Holtey G. Watson E. Freiburg Univ. Dreyer T. Ernst T. Haas J. Hartenthaler H. Jung H. Kabuss E.M. Kroesen G. Landgraf U. Mohr W. Rith K. Schlagbohmer A. Schroeder T. Smith R. Stier H.E. Tieck E. Wallucks W. Hamburg DESY Brasse F.W. Flauger W. Gayler J. Korbel V. Nassalski J. Poensgen B. Hamburg Univ. Bucholtz G. De la Torre A. Figiel J. Hoppe B. Janata F. Rondio E. Studt M. Kiel Univ. AllkoferO.C. Bohm E. DauW. Lancaster Univ. Bee C. Bird I. Coughlan J. Liverpool Univ. Brown S. Court G.R. Gabathuler E. Garnet R. Hayman P. Holt J.R. Pettingale J. Wimpenny S. Marseille C.P.P.M. Albanese J.P. Aubert J.J. Benchouk C. D'Agostini G. Mermet-Guyennet M. Montanet F. Payre P. Pietrzyk B. Mons Univ. Beaufays J. Callebaut D. Grard F. H ant on J. Windmolders R. Munich MPI Dengler F. Derado I. Eckardt V. Manz A. Pawlik B. Schmitz N. Schouten M. Shiers J. Wolf G. Orsay Linear Ace. Lab. (LAL) Blum D. Heusse P. Jacholkowska A. Jaffre M. Pascaud C. Oxford Univ. Geddes N. Johnson A.S. Loken J. Long K. Renton P.B. Taylor G. Williams W.S.C. Rutherford Appleton Lab. Botterill D. Chima J. Clifft R. Edwards M. Norton P.R. Oakham G. Sproston M. Thompson J.C. Sheffield Univ. Combley F. Foster J. Wheeler S. Torino Univ. Arneodo M. Costa F. Dosselli U. Ferrero M.I. Giubellino P. Maselli S. Peroni C. Staiano A. Uppsala Univ. Arvidson A. Badelek B. Calen H. Dahlgren S. Grafstrom P. Hagberg E. Kullander S. Wuppertal Univ. Becks K.H. Braun H. Bruck H. Drees J. Edwards A. Forsbach H. Harnacher K. Korzen B. Kruger J. Paul L. Pavel N. Peschel H. Pietrzyk V. Poetsch M. Schneider A. Preissner H. Stockhausen W. Wahlen H. Budapest Res. Inst. Eizes G. Nagy E. Ribarics P. Toth J. References SPSC|77-113/P18/ADD.l, 79- 17/P 18/Add.2, 79-63/M179, 80-21/M221, 80-80/M 245, SPSC/81-83/M303, SPSC/81-84/M304. SPSC/81 - 102/M310, SPSC/81 -8S/M30S, SPSC/81 - 105/M313 73 NA9 Bonn Univ. Leenen M. Spokesman: Sloan, T. Contactman: Sloan, T. The aim of this experiment is to study the different possible final states in deep inelastic muon scattering from hydrogen in connection with the detection of the scattered muon in a forward spectrometer (Experiment NA2). A vertex detector will be used which extends the hadron detection capabilities into the backward hemisphere of the centre - of-mass system. Particle momenta can be measured down to 200 MeV/c in a vertex magnet, which contains a streamer chamber (SC). Particle identification will be done in a series of wide angle Cerenkov counters (CQ.CJ.CA) and at low momenta in time — of — flight counter hodoscopes (Fl — F4). An 8 —plane module of MWPC chambers (PV) will be used in conjunction with the streamer chamber and the drift chambers WV1, WV2 and WV3. The vertex magnet is a C magnet with circular pole tips of 2 m diameter and 1 m gap width. The central magnetic field will be 1.5 T. The streamer chamber (2m x 1.2m x 0.72m) will contain a 1 m liquid H2 target. As a natural extension of the forward spectrometer, the vertex detector will be used to look for the production of charmed particles and of jet —like objects by virtual photons, and to study inclusive hadron distributions and complete hadronic final states with the largest possible acceptance in connection with the detection of the scattered muon. 75 DUMP LAYOUT 200Gev/c SCINTILLATOR HODOSCDPE S1-S2 R1-2-3-4 MAGNET CP1-2-3-4 (CP 5-6-7-8) Experiment NA10; High Resolution Study of the Inclusive Production of Massive Muon Pairs by Intense Pion Beams DRELL-YAN NA10 Beam H10 Approved 16/MAR/1978 24/JAN/1980 Status Completed 15/AUG/1985 High Resolution Study of the Inclusive Production of Massive Muon Pairs by Intense Pion Beams CERN, Naples Umv.jINFN, Palaiseau Ecfoly. LJPJSFJIJS., StrasbourglCJUV., Zurich E.TJI. CERN Freudenreich K. Naples Untv.jlNFN Carotenuto L. Ereditato A. Gorini E. Strolin P. Palaiseau Ec.Pofy. L.P.N.H.E. Bordaio P. Borenstein S. Busson P. Kluberg L. Romans A. Salmeron R. Vallée C. StrasbourglC.R.N. JuiUot P. Winter M. Zurich E.T.H. Grossmann M. Guanziroli M. Hofer H. Lecomte P. Le Coultre P. Suter H. Telegdi V.L. Sofia Univ. Betev B. Annecy L.A.P.P. Blaising J.J. Degré A. Morand R. Spokesman: Kluberg, L. Contactman. Suter, H. This experiment measures with high resolution and large acceptance the inclusive production of massive muon pairs with the intense pion beam (up to 1010 w/pulse) in the experimental hall ECN3. The experiment explores extended Mz/s,x and transverse momentum ranges. The study of the departures of the lepton—pair production cross— section from scaling constitutes a good test of QCD ideas; in the framework of the 'Drell — Yan' process, the experiment allows a detailed study of the pion parton distribution functions. The detector consists of a beam dump, a pulsed toroidal air—core magnet, MWPC's and scintillator hodoscopes. Its =*3% mass resolution at 10 GeV is adequate for the substraction of resonances in the high—mass region. References SPSC/77-110/P91. 79-129/M210. 80-25/M224, 80-64/M237, 80-88/M 250, SPSC/81-3/M 275, SPSC/81 -8S/M305, SPSC/82-10/M316, SPSC/82-22/M321, SPSC/85-54/M412 77 NAI2 SET-UP AH, AH Experiment NA12: Study of TT"D Interactions with Neutral Final States Beam H8 Approved 16/NOV/1978 Status Completed 18/JUN/1984 Study of 7T~p Interactions with Neutral Final States Annecy LJU*J*., Belgium IJ.SJV., Los Alamos NatXab., Serpukhov IJIJÏJ*. Annecy L.A.P.P. Dufournaud J. Gouanere M. Lac D. Peigneux J.P. Sillou D. Spighel M. Belgium I.l.S.N. Binon F.G. Bricman C. Lagnaux J.P. Mouthuy T. Stroot J.P. lx>s Alamos Nat.Lab. Aide D. Knapp E.A. Martin R. Potter J. Serpukhov l.H.E.P. Donskov S.V. Inyakin A.V. Katchanov V.A. Kakauridze D.B. Khaustov G.V. Kulik A.V. Lednev A.A. Mikhailov Yu.V. Obraztsov V.F. Prokoshkin Yu.D. Rodnov Yu.V. SadovskyS.A. Shagin P.M. Singovsky A.V. Sugonyaev V.P. Louvain Cath. Univ. Possoz A. Spokesman: Prokoshkin, Yu.D. Contactman: Binon, F.G. This experiment is a study of the production of neutral particles or states decaying into photons in the reaction IT ~ + p -• M° + n at SPS energies. Special attention is paid to the measurement of the production of heavy particles with hidden quantum numbers and of possible new heavy spinless states decaying into two photons. The large four — momentum transfer behaviour of binary processes involving known neutral mesons and the production of new meson resonances with high mass and spin will also be studied. Complex multiparticle final states will be analysed as a by — product. The central unit of the experimental set —up is a 4000 cell Cerenkov hodo scope spectrometer (GAMS) which allows the measurement of the momentum vector of each gamma in a multigamma event. The longitudinal position of the interaction point in the liquid hydrogen target is measured by the Cerenkov light intensity. A guard system, made of scintillation counters and lead — glass Cerenkov counters, is used to trigger on neutral events (triggers). A cellular hadron calorimeter which covers a surface slightly larger than the aperture of GAMS itself is being installed behind GAMS. Each cell is a sandwich of 36 2.5cm thick iron plates and 36 0.5cm thick scintillators. It allows to improve background rejection in multiphoton events and to use neutral triggers including those in which neutral kaons are involved. References SPSC/78-9S/P 110, 78-96/PUO/Add.l, 80-90/M252, SPSC/81 -82/M 302, SPSC/81-85/M305, SPSC/84-67/M387 79 NA-U 0 1 2m M H H H HV VV •Q* i M J J B Figure caption: H,v tagging hodosoopes F "crown" lead glass calorimeter M nuon veto G Goliath Magnet A active target I,L Cerenkov Covmters 0 Olga-Penelope Calorimeter B AEG vertex magnet K trigger hodoscopes P iron filter CjD^J MWPC's N Imperial College Calorimeter Q,S y hodoscopes Experiment NA14; Photoproduction at High Energy and High Intensity PHOTOPRODUCTION NA14 Beam E12 Approved 14/DEC/1978 13/DEC/1979 Status Completed 03/SEP/1984 Photoproduction at High Energy and High Intensity Athens Nat. Tech. Univ., CERN, London, Imperial College, Orsay Linear Ace. Lab. (LAL), Palaiseau EcJ*ofy. LJ*JVJI£., Paris College de France, Saclay CEN DPhPE, Southampton Univ., Strasbourg Univ., Warsaw Univ. Athens Nat. Tech. Univ. Filippas T. Fokitis E. Karpathopoulos S. Papadopoulou T. Trakkas C. CERN Andersson L. Barate R. Burmeister H. Engelen J. Hancock S. James F. Katsoufîs E.C. Lassalle J.C. Pattison J.B. Maeshima K. Treille D. London. Imperial College Astbury P. Duane A. Gregory P. Kyberd P. Miller D.B. Morris J.W. Namjoshi R. Siotis T. Virdee T.S. Websdale D.M. Orsay Linear Ace. Lab. (LAL) Bouquet B. D'Almagne B. Ferrer A. Petroff P. Richard F. Roudeau P. Six J. Wojcik W. Wormser G. Palaiseau Ec.Pofy. L.P.N.H.E. Benkheiri P. Costa Ramos S. Rouge A. Wuthrick J.P. Paris College de France Brunet J.M. De Bellefon A. Lefievre B. Poutot D. Tristram G. Saclay CEN DPhPE Bareyre P. Bonamy P. David M. Lemoigne Y. Mouchet J. Villet G. Zolnierowski Y. Saclay CEN DPhN MarshaU T. Southampton Univ. McEwen J.G. Shooshtari H. Strasbourg Univ. Bloch D. Engel J.P. Guyonnet J.L. Schaeffer M. Warsaw Univ. Gorski M. Hofmokl T. Jacholkowska A. Sobczynski C. Milan Univ.jlNFN Rancoita P.G. Spokesman: Treille, D. Contactman: Treille, D. The photon beam used for this programme is tagged and provides a large flux up to very high energies (150-200 GeV). It is also hadron - free, since it is obtained by a two —step conversion method. A spectrometer is designed to exploit this beam and to perfonn a programme of photoproduction with a high level of sensitivity (5 — 50 events/picobarn). Priority will be given to the study of processes exhibiting the point - like behaviour of the photon, especially deep inelastic Compton scattering. The spectrometer has two magnets. Charged tracks are measured by MWPC's located only in field-free regions. Three calorimeters provide a large coverage for identifying and measuring electrons and photons. An iron filter downstream identifies muons. Most of the equipment is existing and recuperated from previous experiments. References SPSC/78-76/P109. 78-139/P 109/Add. 1, 79-1U/M202, 79-124/M208, 80-29/M226, 80-89/M251, SPSC/81 -6/M 276, SPSC/8I -24/M323, SPSC/84- 12/M371 81 H H H HV V Q Figure caption: H,V tagging hodoscopes F "crown" lead glass calorimeter M muon veto G Goliath Magnet A Si active target I,L Cerenkov Counters 0 Olga-Penelope Calorimeter B AEG vertex magnet K trigger hodoscopes P iron filter C,D,E,J MWPC's N Imperial College Calorimeter Q,S y hodoscopes 31 niicrostrip detector Experiment NA14/2: A Program of Heavy Flavour Photoproduction PHOTOPRODUCTION NA14/2 Beam E12 Approved 25/APR/1983 Status Data — Taking A Program of Heavy Flavour Photoproduction Athens Nat. Tech. Univ., CERN, London, Imperial College, Orsay Linear Ace. Lab. (LAL), Paris College de France, Saclay CEN DPhPE, Southampton Univ., Strasbourg Univ., Warsaw Univ. Athens Nat. Tech. Univ. Filippas T. Fokitis E. Papadopoulou T. Trakkas C. CERN Andersson L. Bar ate R. Burmeister H. Di Caccio L. James F. Katsoufis E.C. Pattison J.B. Treille D. London, Imperial College Burtchell M. Cattaneo M. Dixon J. Duane A. Forty R. Hall J. Sees C. Siotis 1. Virdee T.S. Websdale D.M. Orsay Linear Ace. Lab. (LAL) D'Almagne B. Ferrer A. Roudeau P. Six J. Wormser G. Paris College de France Brunei J.M. De Bellefon A. Lefievre B. Poutot D. Triscos P. Tristram G. Saclay CEN DPhPE Bonamy P. Borgeaud P. De Lesquens A. David M. Lemoigne Y. Louis F. Magnevffle C. Poinsignon J. Primout M. Thomas J.F. Villet G. Zolnierowski Y. Southampton Univ. Counihan M. McEwen J.G. Shooshtari H. Strasbourg Univ. Bioch D. Engel J.P. Schaefier M. Warsaw Univ. Hofmokl T. Sobczynski C. Milan Univ./INFN Rancoita P.G. Spokesman: Treille, D. Contactman: Treille, D. This experiment measures the photoproduction of heavy flavours. Most emphasis will be given to the F and Ac. A silicon vertex spectrometer made of an active target and a stack of microstrip detectors, is installed. It allows lifetime measurements as well as a filtering and enrichment fast procedure for charmed events. A sensitivity of 1 evt/picobarn should be obtained. References SPSC/82 - 73/P109/Add. 2, SPSC/83 - 22/M3SI 83 NA20 Beam H2 Approved 15/NOV/1979 Status Completed DEC/1983 Measurements of ir±, K±, p± Yields in 400 GeV Proton Beryllium and Copper Collisions CERN, Rutherford Appleton Lab. CERN AthertonH.W. Wachsmuth H.W. Rutherford Appleton Lab. Venus W. Spokesman: Wachsmuth, H. Contactman: Atherton, H.W. The intention of this experiment is to measure the production rates of v, K, p at some 2 x 35 points in the p-pt plane, i.e. at secondary momenta of 60, 90, 120, 160, 200, 250 and 300 GeV at pt values of 0., 0.167, 0.333, 0.50, 0.667 GeV. The measurements will be done with 400 GeV protons impinging on 50 cm of Be. The beam composition will be measured with two CEDAR counters existing in the H2 beam line. Rtftrtncts SPSC/79 - 107/P 134 85 Veto counter retarget MWPC modules Photon detector NA5 calorimeter Downstream calorimeter Experiment NA24: \l Investigation of Deep Inelastic Scattering Processes Involving Large p Direct Photons in the Final State DIRECT PHOTONS NA24 Beam H2 Approved 27/NOV/1980 Status Completed 15/AUG/1985 Investigation of Deep Inelastic Scattering Processes Involving Large pT Direct Photons in the Final State Ban Univ., Freiburg Univ., Moscow I.TJLJP., Munich MPI Bari Univ. De Marzo C. De Palma M. Favuzzi C. Maggi G. Nappi E. Posa F. Ranieri A. Selvaggi G. Spinelli P. Freiburg Univ. Bamberger A. Fuchs M. Heck W. Marx R. Runge K. Skodzeck E Weber H.C. Wulker M. Moscow I.T.E.P. Artemiev V. Galaktionov Yu. Gordeev A. Gorodkov Y. Kamyshkov Y. Kossov M. Lubimov V. Plyaskin V. Pojidaev V. Shevchenko V. Shoumilov E. Tchudakov V. Munich MPI Bunn J. Fent J. Freund P. Gebauer HJ. Glas M. Polakos P. Pretzl K.P. Schouten T.E. Seyboth P. Seyerlein J. Vesztergombi G. Spokesman: Pretzl, K.P. Contactman: Pretzl, K. This experiment will investigate various aspects of photon — parton scattering and will be performed in the H2 beam of the SPS North Area with high intensity hadron beams up to 350 GeV/c. a) The directly produced photon yield in deep inelastic hadron—hadron collisions. Large p^ direct photons from hadronic interactions are presumably a result of a simple annihilation process of quarks and antiquarks or of a QCD-Compton process. The relative contribution of the two processes can be studied by using various incident beam projectiles IT +, IT ", p and in the future p. b) The correlations between directly produced photons and their accompanying hadronic jets. We will examine events with a large p^ direct photon for away —side jets. If jets are recognised their properties will be investigated. Differences between a gluon and a quark jet may become observable by comparing reactions where valence quark annihilations (away — side jet originates from a gluon) dominate over the QDC —Compton processes (away —side jet originates from a quark). The apparatus consists of the two calorimeters used in the NA5 experiment, a high resolution photon detector, a fast proportional chamber telescope, a liquid hydrogen target. References 79-115/SPSC/I 124, 80-83/SPSC/P 151, SPSC/81 - 1O3/M3Ï1, SPSC/83 - 3/M344, SPSC/85- 51/M410 87 HOLEBC Experiment NA27: An Experiment to Measure Accurately the Lifetime of the D°, D±, F±, A Charm Particles and to Study their Hadronic Production and Decay Properties NA27 Beam H2 Approved 09/DEC/1981 Status Completed 01/JUN/1984 An Experiment to Measure Accurately the Lifetime of the D°, D±, F±, A, Charm Particles and to Study their Hadronic Production and Decay Properties Aachen TH, Brussels, IIHE, Bombay Univ., CERN, Duke Univ., Genova Univ.flNFN, Japan U.G., Liverpool Univ., Madrid J£JV., Mons Univ., Oxford Univ., Padova Univ., Paris College de France, Paris VI Univ., Rome Univ., Rutgers Univ., Rutherford Appleton Lab., Serpukhov IHJiJP., Stockholm Univ., Strasbourg Univ., Tennessee Univ., Torino Univ., Trieste Univ., Vienna Akad. Wissensch., Zeuthen lnstH£nfhys. Aachen TH Deutschmann M. Otter G. Schluetter H. Schulte R. Struczinski W. Brussels, IIHE Bertrand G. Lemonne J. Vonck B. Vilain P. Wickens J.H. Bombay Univ. Ganguli S.N. Gurtu A. Malhotra P.K. Raghavan R. Shankar K. Schrankar A. Subramanian A. Sudh.kar K. CERN Bagnaia P. Brun R. Fernandez C. Hernandez J.A. Herve A. Johansson E.K. Leutz H. Montanet L. Poppleton A. Reucroft S. Schooten M. Touboul M.C. Duke Unit. GoshawA.T. Kowald W. Robertson W.J. Walker W.D. Wild C. Genova Univ.lINFN Caso C. Contri R. Fontanelli F. Monge R. Squarcia S. Trevisan U. Japan U.G. Chiba Y. Emura T. Hamatsu R. Hirose S. Kaneko S. Kita I. Kitamura S. Kono H. Matsumoto S. Oshima N. Takahashi K. Tsugurai T. Yamagata K. Yuasa F. Liverpool Univ. Fry J.R. Houlden M.A. Patel G. Roberts K. Whyman B. Mr J'id J.E.N. Aguilar - Benitez M. Castano B. Colino N. Diez F. Ladron de Guevara P. Mons Univ. Bailly J. Baland J.F. Grard F. Herquet P. Pilette P. Oxford Univ. Allison W.W.M. Gibaut D. Lyons L. Wright P. Padova Univ. Bettini A. Checchia P. Cresti M. De Angelis A. Gasparini U. Mazzucato M. Peruzzo L. Pinori C. Rossi P. Sartori G. Ventura L. Zotto P. Zumerle G. Paris College de France Beilliere P. Dolbeau J. Laloum. M. Paris VI Univ. Brian d H. De Billy L. Duboc J. Dumarchez J. Laberrigue J. Nguyen H.K, Yiou T.P. Rome Univ. Bizzarri R. Di Capua E. Falciano S. Forni A. Gentile S. Iori M. Loverre P.F. Marel G. Marzano F. Piredda G. ZaneUo L. Rutgers Univ. Di Marco R. Kalekar M. Piano R.J. S tamer P. Rutherford Appleton Lab. CrenneU D.J. Fischer C. Hughes P. Mac Dermott M. Serpukhov I.H.E.P. Fisjak Y. Kistenev E.P. Knyazev V. Petrovich Y. Stopchenko V. Vlasov E. Stockholm Univ. Haupf L. Hellman S. Holmgren S.O. Moa T. Nilsson S. Sellden B. References SPSC/81 -86/P169, SPSC/83-8S/M370 89 NA27 Sffasbourg Univ. Braun H. Huss D. Jegham E. Michalon A. Michalon M. Voltolini C. Tennessee Univ. Bugg W.M. Torino Univ. Borreani G. Marchetio F. Rinaudo G. Ttieste Univ. CasteUi E. Cauz D. Poropat P. Sessa M. Tronçon C. Vienna Akad. Wissensch. Bartl W. Epp B. Hrubec J. Markytan M. Neuhofer G. Pernika M. Porth P. Régler M. Rohringer H. Schmidmayer J. Zeuthen inst.H.En.Phys. Friebel W. Gensch U. Knauss D. NaumannT. Nowak H. Wischnewski R. Spokesman: Montanet, L. Contactman: Montanet, L. We propose to use the EHS with the hydrogen bubble chamber HOLEBC equipped with classical optics to accumulate statistics of several hundred fully reconstructed DD and D± and several tens of F± and Ac decays produced by 360 GeV/c ir~ and 360 GeV/c proton beams. The main aim of the experiment is to determine accurately the lifetime of these particles. Interesting information will also be obtained on branching ratios, decay modes and hadronic production mechanisms. 91 TARGET PV» H PV» F» Pta Pi PiPi BHA Vl Vz SC PVi J WFI WVi VAtoW* W7 H1.H5 t ! ? » '. î- Experiment NA28: Study of Shadowing and Hadron Production in High Energy y Scattering Using Nuclear Targets NA28 Beam M2 Approved 17/FEB/1982 Status Completed 20/DEC/1983 Study of Shadowing and Hadron Production in High Energy M Scattering Using Nuclear Targets Aachen TH, Annecy LAJJP., CERN, Freiburg Univ., Hamburg DESY, Hamburg Univ., Kiel Univ., Lancaster Univ., Liverpool Univ., Marseille C.PJ'JVf., Mons Univ., Munich MPI, Orsay Linear Ace. Lab. (LAL), Oxford Univ., Rutherford Appleton Lab., Sheffield Univ., Torino Univ., Uppsala Univ., Wuppertal Univ. Aachen TH BerghofT G. Duren M. Hasert F.J. Lanske D. Schultze K. Urban L. Annecy L.A.P.P. Berlsch Y. de Bouard X. Coignet C. Favier J. Jancso G. Maire M. Mtnssieux H. Moynot M. Pessard H. Schneegans Ni. Thenard J.M. Vivargent M. CERN Dobinson R.W. Goessling C. Gustafsson L. Kellner G. Muller Hans R. Osborne A.M. Osborne L. Sloan T. Watson E. Freiburg Univ. DreyerT. Ernst T. Haas J. Hartenthaler H. Jung H. Kabuss E.M. Kroesen G. LandgrafU. Mohr W. Rith K. Schlagbohmer A. Schroeder T. Smith R. Stier H.E. Tieck E. Wallucks W. Hamburg DESY Brasse F.W. Flauger W. Gayler J. Korbel V. Nassalski J. Poensgen B. Hamburg Univ. Bucholtz G. De la Torre A. Figiel J. Hoppe B. Janata F. Rondio E. Studt M. Kiel Univ. AllkoferO.C. Bohm E. Dau W. Lancaster Univ. Bee C. Bird I. Coughlan J. Liverpool Univ. Brown S. Court G.R. Gabathuler E. Garnet R. Hayman P. Holt J.R. Pettingale J. Wimpenny S. Marseille C.P.P.M. Albanese J.P. AubertJ.J. Benchouk C. D'Agostini G. Mermet-Guyeruwt M. Montanet F. Payre P. Pietrzyk B. Mons Univ. Beaufays J. Callebaut D. Grard F. H an ton J. Windmolders R. Munich MPI Dengler F. Derado I. Eckardt V. Manz A. Schmitz N. Shiers J. Wolf G. Orsay Linear Ace. Lab. (LAL) Blum D. Heusse P. Jacholkowska A. Jaffre M. Pascatid C. Oxford Univ. Geddes N. Johnson A.S. Loken I. Long K. Mount R. Renton P.B. Taylor G. Villers M. Williams W.S.C. Rutherford Appleton Lab. Best C. Botterill D. Chima J. Cliffl R. Edwards M. Norton P.R. Oakham G. Sproston M. Thompson J.C. Sheffield Univ. Combley F. Foster J. Wheeler S. Torino Univ. Arneodo M. Costa F. Ferrero M.I. Giubellino P. Maselli !5. Peroni C. Staiano A. Uppsala Univ. Arvidson A. Badelck B. Ctlen H. Dahlgren S. Grafstrom P. Hagberg E. Kullander C. Wuppertal Univ. Becks K.H. Braun H. Bruck H. Ore» J. Edwards A. Fortbach H. Harnacher K. Korzen B. Kruger J. Paul L. Pavel N. Peschel H. Pietrzyk U. Poetsch M. Preisintr H. Schneider A. Stockhausen W. Wahlen H. Budapest Res. lust. Eszet G. Nagy E Ribvics P. Toth J. Spokesman: Sloan, T. Contactman: Sloan, T. References SPSQS2-4/P176. SPSC/83-7S/P17ô/A The experiment is based on the full EMC apparatus (Expts. NA2/NA9) and will in addition use a system of fine hodoscopes to trigger on scattered muons at very small angle. The trajectory of these scattered muons will be measured in proportional wire chambers which are live also in the beam region. The basic aim of the experiment are twofold: a) Study of the components, point-like and hadron —like of the photon through a study of shadowing. This involves the measurement of the total virtual photon cross section as a function of its total mass squared (Q2) and the Bjorken invariant x.j on a series of nuclear targets. Since two essential nuclei are H2 and D2, information will also be obtained on the proton and deuteron structure functions for very low x. j values. b) By examining the change of the distribution of hadrons produced by muon scattering on nuclei, information can be obtained on the evolution of the elementary quark system into the observed hadrons. Under certain kinematic conditions the data will provide measurements of the interaction cross — section of the quarks with nuclear matter. electron beam Pb glass Cerenkov counter Beam H6 1 cm Fig. 1. Minimal detector equipment in the H6 beam. S1 and S2 scintillation counters. Extracted proton beam PO = 1 mm = Fig. 2. 3 target configurations for the determination of the lifetime: 1: foil separation of the order of the mean decay length 2: zero foil separation 3: "infinite" foil separation Experiment NA30: Precision Determination of the Lifetime of the Neutral Pion NA30 Beam H6 Approved 17/JUN/1982 Status Completed 01/JUN/1984 Precision Determination of the Lifetime of the Neutral Pion Ames Lab., CERN, Chicago Univ., Lund Univ., Paris VI Univ. Ames Lab. Anderson E.W. CERN Atherton H.W. Bovet C. Coet P. Desalvo R. Doble N. Malleyran R. Chicago Univ. CroninJ.W. Mffliken B. Lund Univ. Von Dardel G. Kulka K. Paris VI Univ. Coratav M. Spokesman: von Dardel, G. Contactman: Coet, P. The experiment aims at a determination of the lifetime of the neutral pion with an accuracy of 1%, as against at present 5% for the best measurement by the indirect, Primakoff method, and 18% by a direct measurement. 2 gold foils with different separations are traversed by the extracted proton beam to the High Intensity Area. Positive particles of 160 GeV/c momentum from this target are transported by the H6 beam to the North Area. The electron component is separated from heavier particles by synchrotron losses in the bending magnets, and is further identified by a lead glass Cerenkov counter, in coincidence with scintillation counters (Fig. 1). The electron flux from the double foil target depends on the distance between the foils, since for small separations the neutral pions will have to decay before electrons can be materialised by the decay gamma rays. The average momentum of neutral pions from a 400 GeV pN reaction, giving a 160 GeV/c electron, is about 2S0 GeV/c, and the corresponding decay length is 40 microns. We intend to carry out the experiment in two slightly different versions. In the first method we compare the electron flux from a number of composite target assemblies (fig. 2). A double thickness foil realises zero separation, and two foils at large (a few mm) separation are noncritical. The critical assembly for a separation of about SO microns will be realised by gold layers, deposited on the sides of a SO microns glass plate. The electron flux from this target will be compared with that from an identical glass plate with gold only on the downstream side and a single foil upstream. In the second method two gold foils will be mounted on a precision mechanical stage, which will alow the separation to be varied at will to a precision of a fraction of a micron. Htferenta SPSC;;»2 - 3S//P117//RCV., SPSQJ2 - 9? K°- DETECTOR PART Date 201181 MWPC Anti- Anti- MWPC electronic Hadron Calorimeter Muon CH1 Counter 3 Counter I* CH 2 shower 1,5 x 2,6 m Detector .- detector Vacuum He S He "j He He He -* i," Beam D Dump Bsam \ \ \, \ - • ~25m -0,8 ~26m - 5,4m -tm ~28m ~ 6m 96m from coîlimator Experiment NA31: Measurement of !nnnl2/]n !2 1 ' ' " ' " ' + — CP VIOLATION NA31 Beam K4 Approved 16/SEP/1982 Status Data-Taking Measurement of \voo\2/\v+-\ CERN, Dortmund Univ., Edinburgh Univ., Orsay Linear Ace. Lab. (LAL), Pisa Univ.lINFN, Siegen GHS CERN Alherton H. Burkhardt H. Clarke P. Cundy D.C. Doble N. Gatignon L. Hagelberg R. Kesseler G. Mannelli I. Miczaika T. Sander H.G. Schaffer A.C. Schlatter D. StefFen P. Steinberger J. Taureg H. Wahl H. Youngman C. Dortmund Univ. Bluetner H. Dietrich G. Eisele F. Heinen W. Kasemann M. Kleinknecht K. Renk B. Edinburgh Univ. Candlin D.J. Muir J. Peach K.J. Pijlgroms B. Shipsey I.P. Stephenson B. Orsay Linear Ace. Lab. (LAL) Auge E. Corti M. Fournier D. Heusse P. Lutz A.M. Pascaud C. Pisa Univ.jINFN Antonelli G. Bertanza L. Bigi A. Calvetli M. Carosi R. Casali R. Cerri C. Fantechi R. Nappi A. Pierazzini G.M. Siegen GHS Becker C. Heyland D. Holder M. Rost M. Weihs W. Zech G. Spokesman: Wahl, H. Contactman: Wahl, H. The aim of this experiment is an accurate determination of the ratio of neutral to charged two pion decays of K^ and Kg mesons: In the superweak model of CP violation this ratio is equal to one exactly. Sizeable deviations from unity are predicted in popular models of the weak and electromagnetic interaction among six quarks. The two decay modes K° -* 2v° and K° •• ir+ir~ are measured simultaneously, and alternately in Kj^ and Kg beams. The detector consists of 1) an evacuated decay region; 2) proportional wire chambers to measure the charged pion directions; 3) a liquid argon calorimeter with good energy and position resolution to measure the photons from it0 decavs; 4) ah' .on calorimeter to measure the energy of the charged pions; 5) a plane of scintillation counters serving as muon identifier. It is intended to work in the 50—150 GeV K° energy range, and to collect more than 10s useful decays. SF5O8!-11l«WPn4. SPSQS2-32lPn4/Add.l, SPSC/82 - 39/M328, SP5C/82 - S3/.M336, SPSC/83 - 78/M366, SPSC!S4-e6JM386 99 MA P32 P33 MB DC4 G M1 DC BEAM 1 CCDS B1 B2 B7 T \ \ , VI V2 —i M^— 0° - 90° 0° Y JO (mm) 0 I—I i I i i i 0 50 Z(mm) CCDS (DETAIL) SUPPORTS AND COOLING B Beam telescope (7 planes of strip detectors) V Vertex telscope (8 planes of strip detectors CCD Charge coupled device T 2.5 mm Cu target M1.M2 Large aperture spectrometer magnets DC Drift chambers C1.C2.C3 Multicell threshold Cerenkov counters P3 Multiwire proportional chambers MA.MB Scintillator arrays G Forward photon calorimeter Experiment NA32: Investigation of Charm Production in Hadronic Interactions Using High-Resolution Silicon Detectors ACCMOR NA32 Beam H6 Approved 18/NOV/1982 Status Data-Taking Investigation of Charm Production in Hadronic Interactions Using High-resolution Silicon Detectors Amsterdam NIKHEF, Bristol Univ., CERN, Cracow InstJVuclJ*hys., Munich MPI, Rutherford Appleton Lab., Santander Univ., Valencia Univ. Amsterdam NIKHEF Damn C. Tiecke H. Wiggers L. Bristol Univ. Gilmore R. Kwan W. Malos J. CERN Castillo V. Chabaud V. Horisberger R. KelseyGD. Weilhammer P. Cracow Inst.Nucl.Phys. HajdukZ. Palka H. Rybicki K. Turala M. Zeludziewicz T. Munich MPI Bosnian M. Barlag S. Dietl H. Lutjens G. Lutz G. Manner W. Seebrunner H. Stierlin U. Rutherford Appleton Lab. Damerell C. Gillman A. Pepe M. Richardson J.A. Watts S. Wickens F.J. Lausanne Univ. Boehringer T. Santander Univ. Ruiz A. Valencia Univ. Higon B. Hamburg DESY Klanner R. Spokesman: Weilhammer, P. Contactman: Tiecke, H. The experiment is designed to measure the lifetime of the P and Ac> The first level trigger uses scintillator and Cerenkov hodoscope information to select events with at least two particles of opposite charge and compatible with being a kaon or proton. The second level trigger makes use of the FAMP microprocessor system to determine the momenta of the selected particles using the information from S MWPC planes, assuming that the particles come from a point target. Only those events are accepted where the selected particles had momenta in the range of the momentum bands given by the Cerenkov counter thresholds. The full kinematic reconstruction of the charm decays is achieved using the information from the different parts of the spectrometer 1) a vertex telescope of eight planes of 5 pm resolution silicon strip counters and two charged couple devices having a spatial resolution of « 5 pm in x and y. 2) a beam telescope of seven planes of 3 jim resolution silicon strip counters 3) two large aperture spectrometer magnets 4) fifty six planes of drift chambers 5) three multicell threshold Cerenkov counters 6) large area lead scintillator shower counter. Ktf&nmca SPSCU-57??1M. SPSCj«4-1SlM372, SPSQS5-B/M40I 101 Negative Energy Continuum -,. FIG. 1 HORIZONTAL PLANE PHOTON CALORIMETER T-.» CONVERSION TARGET Ti COOIABLE CRYSTAL TARGET * IF BIHBPU : 0 FIG. 2 Experiment NA33: Experimental Study of Single Vertex (e e ) Pair Creation in a Crystal CRYSTAL NA33 Beam H2 Approved 02/FEB/1984 Status Completed JUL/1985 Experimental Study of Single Vertex (e~ -e+) Pair Creation in a Crystal Albany SUNY, Annecy L^IJPJ*., Frascati NatJLab. (INFN), Lyon Univ. Albany SUNY Cue N. Kimball J. Marsh B. Sun C.R. Annecy L.A.P.P. Dufournaud J. Peigneux J.P. Sillou D. Spighel M. Frascati Nat.Lab. (INFN) Bologna G. Lyon Univ. Belkacem A. Chevallier M. Clouvas A. Gaillard M.J. Genre R. Kirsch R. Poizat J.C. Remillieux J. Spokesman: Remillieux, J. Contactman: Sillou, D. This expeiiment will study the newly predicted process of e" — e+ pair production by high energy photons incident along major axial direction of a single crystal. This process is based upon the well known channelling properties of negatively charged particles along atomic rows of L crystal. The e~ -e+ pair creation may proceed in a one — step process, without violating energy and momentum conversation laws, due to the lowering of the total energy of the channelled electron (Fig. 1). The pair creation rate should increase with increasing photon energies (above a threshold of a few GeV) and largely exceed the Bethe — Heitler process rate for photon energies of a few tens of GeV. It is also expected that the created particles share the photon energy nearly equally, in contrast with the rather flat energy distribution associated with the Bethe — Heitler process. The experimental set —up (Fig. 2) is designed for the study of those two features: photon energy dependence of the pair creation rate, and energy distribution in the created pair. Starting from a tightly collimated electron beam (150 GeV), a tagged bremmstrahlung photon beam is directed onto a thin single crystal mounted on a high precision goniometer. Behind the crystal the electron pairs are detected by means of a momentum dispersive magnet followed by two hodoscope —plus-lead —glass detectors located symmetrically with respect to the photon beam direction. 103 EXTERNAL SPECTROMETER SPECTROMETER Fe H2 H3 Mognet PCO PC1 PC 3 PC4 PC5 PC6 PC /Conv. Magnet BEAM H8 DC1 Wire Target 1 Om 10 15 t Experiment NA34: Lepton Production PROMPT LEPTON NA34 Beam H8 Approved 29/MAR/1984 Status Setting-Up Lepton Production Brookhaven Nat. Lab., CERN, Heidelberg Univ., London, Bbrkbeck College, London, University College, Los Alamos NatJLab., Lund Univ., Montreal McGill Univ., Montreal Univ., Moscow Lebedev PhysJnst., Moscow EngJPhysJnst., Novosibirsk InstJVuclJ'hys., Pittsburgh Univ., Rutherford Appleton Lab., Saclay CEN DPhPE, Stockholm Univ., Tel-Aviv Univ. Brookhaven Nat. Lab. Gordon H. Ludlam T. Olsen L. Polychronakos V.A. Rahm D.C. Stumer I. Woody C. CERN Akesson T. Atherton H.W. Chesi E. Dederichs K. Esten M. Fabjan C. Mjornmark U. Piuz F. Rudge A. SchukraftJ. Seman M. VanuxemJ.P. Wigmans R. Willis W.J. Heidelberg Univ. GlaesselP. Goerlach U. Kroh V. Pfeiffer A. Soltani J. Specht H.J. London. Birkbeck College Roberts I. Trent P. London. University College Bartley J.H. Davis D.H. Lush G.J. Los Alamos Nat.Lab. van Hecke H. DiGiacomo N.J. McGaughey P.L. Sondheim W.E. Sunier J.W. Lund Univ. Almehed S. Haglund R. Hedberg V. Jarlskog G. Johansson S. Lorstad B. Montreal McGUl Univ. Corriveau F. Hamel L.A. Leroy C. Sirois Y. Montreal Univ. Beaudoin G. Beaulieu J.M. Depommier P. Jeremie H. Lessard L. Lourds A. Moscow Lebedev Phys.Inst. Gavrilenkov 1. M ay bur ov S. Shmeleva A. Moscow Eng.Phys.Inst. Cherniatin V. Dolgoshein B. Golubkov Yu. Kalinovsky A. Kantserov V. Nevsky P. Sumarakov A. Novosibirsk lnst.Nucl.Phys. Sidorov V. Tikhonov Yu. Pittsburgh Univ. Cleland W.E. Clemen M. Collide B. Murray M. Thompson J. Rutherford Appleton Lab. McCubbin N.A. Saclay CEN DPhPE Gaidot A. Gibrat F. London G.W. Pansart J.P. Stockholm Univ. Erlandison B. Hellman S. Nielnon S. Sellden B. Tel-Aviv Univ. Benary O. Dagan S. Linauer D. Oren Y. Brussels. I1HE Roosen R. KEK Japan En'yo H. Syracuse Univ. Bettoni D. Spokesman: McCubbin, N.A. Contactman: Fabjan, C. Rtftrenctt SPSQS3-51/PU9 105 PROMPT LEPTON NA34 HELIOS Collaboration This experiment aims to settle open questions in the hadronic production of electrons, muons and neutrinos. Prominent among these are e/ji universality, anomalies in the production of single leptons, the contribution of charm decay to leptons pair production, and the "anomalous" low mass pairs. The experimental design aims to optimize the combination of: — electron identification (background < 10~6) — muon identification (background < 10"5) — missing energy measurement for neutrinos (AE/E =«1.3% for E =450 GeV) — vertex identification (for T = T « ). The major components of the apparatus are shown in the figure. In the vertex region a proton beam of transverse size ^50 n impinges on a beryllium target of diameter 50 ft, and high precision tracking in the vertex region is achieved by silicon strip detectors. Charged particle momenta are measured using a dipole magnet and high resolution drift chambers. Electrons are identified by the combination of the transition radiation detector and the finely segmented front section of the Uranium/Liquid Argon calorimeter. Essentially the complete centre of mass solid angle is covered by the Uranium/Scintillator arid Uranium/Liquid Argon calonmeters. Further downstream, muons are identified and measured in a modified version of the N * _nuon spectrometer. As an example of ' kind of precision obtainable, we expect to test en universality in D decay to « 1%. 107 EXTERNAL SPECTROMETER SPECTROMETER Fe H2 H3 Magnet PCO PC1 PC 3 PCA PC5 PC6 PC/Conv. Magnet BEAM H8 0C1 Wire Target 1 Om 10 15 i Experiment NA34/2: Study of High Energy Densities over Extended Nuclear Volumes via Nucleus-Nucleus Collisions at the SPS Approved 15/NOV/1984 Status Preparation Study of High Energy Densities over Extended Nuclear Volumes via Nucleus-Nucleus Collisions at the SPS Brookhaven Nat. Lab., CERN, Heidelberg Univ., Los Alamos NatXab., Lund Univ., Montreal McGill Univ., Montreal Univ., Moscow Lebedev PhysJnst., Moscow EngJ*hysJnst., Novosibirsk InstJVuclJ*hys., Pittsburgh Univ., Saclay CEN DPhPE, Stockholm Univ., Tel-Aviv Univ. Brookhaven Nat. Lab. Gordon H. Ludlam T. Olsen L.H. Polychronakos V. Rahm D.C. Stumer I. Woody C. CERN Akesson T. Atherton H. Chesi E. Dederichs K. Esten M.S. Fabjan C. Mjornmark U. Piuz F. Rudge A. SchukrafW. Seman M. Vanuxem J.P. Wigmans R. Willis W.J. Heidelberg Untv. GlaesselP. Goerlach U. Koch V. Pfeiffer A. Soltani J. Specht H.J. Los Alamos Nat.Lab. van Hecke H. DiGiacomo N.J. McGaughey P.L. Sondheim W.E. Sunier J.W. Lund Univ. Almehed S. Haglund R. Hedberg V. Jarlskog G. Johansson S. Lorstad B. Montreal McGill Univ. Corriveau F. Hamel L.A. Leroy C. Sirois Y. Montreal Univ. Beaudoin G. Beaulieu J.M. Depommier P. Jeremie H. Lessard L. Lounis A. Moscow Lebedev Phys.Inst. Gavrilenkov I. Mayburov S. Shmeleva A. Moscow Eng.Phys.Inst. Cherniatin V. Dolgoshein B. Golubkov Yu. Kalinovsky A. Kantserov V. Nevsky P. Sumarakov A. Novosibirsk Inst.Nucl.Phys. Sidorov V. Tikhonov Yu. Pittsburgh Univ. Cleland W. Clemen M. Collick B. Murray M. Thompson J. Saclay CEN DPhPE Gaidot A. Gibrat F, London G.W. Pansart J.P. Stockholm Univ. Brlandsson B. Hellman S. Nielsson S. Sellden B. Tel-Aviv Univ. Benary O. Dagan S. Lissauer D. Oren Y. Brussels, UHE Roosen R. Syracuse Univ. Bettoni D. Spokesman: Specht, H.J. Contactman: Fabjan, C. HELIOS Collaboration We propose to examine in detail the characteristics of ultra—relativistic nucleus—nucleus interactions using 10O beams of 200 GeV/A from the SPS. The experiment combines An calorimeter coverage with measurements of inclusive particle spectra, two—particle correlations, low— and high—mass lepton pairs and photons. A multiwire active target allows maximum interaction rates with a minimum of secondary interactions. Rtfttcnta SPSCJ14-43//P203 109 PPD RING KTERKEOIATE SS ,Vî VETO S6 CALORIMETER CALORIMETER CAL. S3 p_ _ — — — -4 1 Experiment NA35: Study of Relativistic Nucleus-Nucleus Collisions IONS/STREAMER CH. NA35 Beam H2 Approved 03/FEB/1983 15/NOV/1984 Status Preparation Study of Relativistic Nucleus-nucleus Collisions Athens Univ., Ban Univ., CERN, Cracow InstJVuclJPhys., Darmstadt GSI, Frankfurt/Main Univ., Freiburg Univ., Heidelberg Univ., Lawrence Berkeley Lab., Marburg Univ., Munich MPI, Texas A&M Univ., Warsaw Univ., Zagreb Rudjer Boskovic last. Athens Univ. Aris A. Kakoulidou M. Margetis S. Panagiotou A. Ban Univ. De Marzo C. De Palma M. Favuzzi C. Lapova P. Maggi G. Nappi E. Posa F. Ranieri A. Selvaggi G. Spinelli P. CERN Bangert D. Cracow InsrNucl.Phys. Bartke i. Kowalski M. Darmstadt GSI Bock R. Brockmann R. Guerra C. HumanicT. Sandoval A. Stroebele H. Wensveen M. Frankfurt/Main Univ. Stock R. Freiburg Univ. Bamberger A. Heck W. Runge K. Heidelberg Univ. Renfordt R. Schall D. Lawrence Berkeley Lab. Harris i. Odyniec G. Pugh H.G. Schroeder L. Ticknell M. Marburg Univ. Puelhofer F. Rauch W. Roehricht D. Wenig S. Munich MPI Derado I. Eckardt V. Fendt J. Freund P. Gebauer H.J. Pretzl K.P. Schmitz N. Seyboth P. Seyerlein J. Texas A&M Univ. Wolf K. Warsaw Univ. Bialkowska H. Gazdzichi M. Szwed R. Skrzypczak E. Zagreb Rudjer Boskovic Inst. Kadija K. Paie G. Vranic D. Spokesman: Stock, R. Contactman: Sandoval, A. The aim of this experiment is to survey the reaction mechanisms involved in the collision of 60 GeV/nucleon and 200 GeV/nucleon light ions (16O and 32S provided by a new GSI-LBL injector) with different nuclei, to determine the stopping power of nuclear matter and to search for evidence of formation of quark matter or qark gluon plasma by comparison to hadron — nucleus reations at the same incident energies. The experimental set —up consists of a 2 m Streamer Chamber in the Vertex Magnet used to detect all the charged particles emerging from the interaction as well as the neutral strange particles that decay inside the chamber. The high energy forward going particles are detected by four sets of calorimeters. A highly segmented Photon Position Detector (PPD) backed up by a 240 segment Ring Calorimeter will cover one unit of rapidity around mid—rapidity. An Intermediate Calorimeter will cover the rest of the forward phase space except for the region around beam rapidity, where a Veto Calorimeter will detect beam spectators. For each event the charged particle multiplicity, the IT0 multiplicity around mid — rapidity, the proton and pion rapidity distributions, the mean transverse momentum for charged pions, the energy Sow and the strange particle production will be determined. References PSCC 82 - 1 ;PS3, PSCC/82-9,/PS3/Add.l, SPSQ8S -26AM04. SPSQ8S -36/M407 D2 D3 W2D4 W2D5 W2 D6 U1 BEAM "I BT M1IGD INC M2 H2.FGD FNC ff ff 6 7 8 9 10 15 18 19 20 meters BT = beam tag U1. U3 \ ... AT = active target WO W2J prop wire chambers M1 M2 = magnets D2-D6 = drift chambers H1 H2 = hodoscopes IGD, FGD = gamma detectors INC, FNC = hadron calorimeters Exepriment NA36; Production of Strange Baryons and Antibaryons in Relativistic Ion Collisions Beam H2 Approved 15/NOV/1984 Status Preparation Production of Strange Baryons and Antibaryons in Relativistic Ion Collisions Athens Nat. Tech. Univ., Bergen Univ., Birmingham Univ., Brookhaven Nat. Lab., Carnegie-Mellon Univ., CERN, Chandigarh, Punjab Univ., City College of New York, Cracow InstJVuclJ*hys., Lawrence Berkeley Lab., Strasbourg Univ., Vienna Akad. Wissensch. Athens Nat. Tech. Untv. Elefteriades G. Gazis E.N. Papadopoulos C. Vlastoy R. Bergen Univ. Lovhoiden G. Thorsteinsen T.F. Birmingham Univ. Nelson J.M. Morrison G.C. Brookhaven Nat. Lab. Etkin A. Foley K. H->ckenburg R. Morris T. Longacre R. Lone W. Platner E. Saulys A. Carnegie-Mellon Univ. Barnes P.D. Franklin G. Hertzog D. Quinn B. CERN Montanet L. Powell B. Chandigarh, Punjab Univ. BhatiaV.S. Kohli J.M. Mittra I. Singh J. City College of New York Chang C. Kramer M. Lindenbaum S. Cracow Inst.Nucl.Phys. Natkaniec Z. Rozanska M. Rybicki K. Sakrejda I. Turnau J. Lawrence Berkeley Lab. Geist W.M. Greiner D. Gruhn C.R. Heiden M. Pugh H.G. Strasbourg Untv. Blaes R. Braun H. Huss M. Michelon A. Michelon M.E. Riester J.L. Voltolini C. Vienna Akad. Wissensch. Hrubec J. McNaughton J. Neuhofer G. Porth P. Rohringer H. Spokesman: Geist, W.M. Contactman: Gruhn, C.R. A new state of matter — the quark—gluon plasma — may be produced in 16O collisions with heavy nuclei A (A = Al, Cu, Au) at beam momenta up to 225 GeV/c per nucléon. A possible signature of this state is a strongly enhanced yield of strange quark pairs. The aim of the experiment is therefore a measurement of differential cross sections for production of neutral kaons, A, S, fl and their antiparticles with high statistics. Furthermore charged particle trajectories will be reconstructed and the total energy flow and its fluctuations will be determined in the forward c.m.s. hemisphere. The experiment is performed with a modified EHS configuration; its characteristic features are: — An active target. — A TPC for 3 —dimensional unambiguous space point tracking. — A magnet to sweep most of the produced particles from the tracking devices. — Hadronic and electromagnetic calorimeters covering hennetically the forward cm.s. hemisphere. — A fast data acquisition system based upon Fastbus. References SF5C/M-13/P196, SPSC/84 - 48/M382, SPSC/84 - 79/M390, SPSC/8S-70/M419 113 P4C P4A P5A P5B (BHE/F) MWPC\ 17/18 j H3H H3.9 \ W1 W2 V1.5 V3 V2.1 V2 \/ 2 12 TARGET FSM C2 H2 \ \ P0B PV1 P1 P2 P3 (P0A) \ P0E H3V H3H \ BHA BHA' BHB1 BHB P0'C PV2 P0D H1H HIV W4A | W5A W5B W6 W7 I H5 Fe I I I I I I 0 12 3 4 5m Experiment NA37: Detailed Measurements of Structure Functions from Nucléons and Nuclei MUNUCLEUS NA37 Beam M2 Approved 06/JUN/1985 Status Preparation Detailed Measurements of Structure Functions from Nucléons and Nuclei Bielefeld Univ., Freiburg Univ., Heidelberg MPI, Indiana Univ., Mainz Univ., Mons Univ., Neuchatel Univ., Oxford Univ., U.C. Santa Cruz, SJJV., Torino Unh.jINFN, Uppsala Univ., Warsaw Univ., Wuppertal Univ. Bielefeld Univ. Baum G. Freiburg Univ. Kabuss E. Landgraf U. Rith K. Schlagboehmer A. WaUucks W. Heidelberg MPI aird I.G. Brueckner W. Doeobeling H. von Harrach D. Mizuno Y. Povh B. Staiano A. Treichel M. Indiana Univ. Crittenden R. Dzierba A. Heinz R. Zieminska D. Zieminski A. Mainz Univ. Walcher T. Mons Univ. Beaufays J. Windmolders R. Neuchatel Univ. Fluri L.D. Gretillat P. Schwarz E. Vuilleumier J.L. Oxford Univ. Taylor G. U.C. Santa Cruz Heusch C. S.I.N. Botje M. Burger W. Domingo J. Ingram Q. Schumacher R. Sennhauser U. Torino Univ./INFN Allasia D. Arneodo M. Ferrero M.I. Peroni C. Uppsala Univ. Ardvidsson A. Grafstrom P. Hagberg E. KuUander S. Lettenstrom F. Lindholm B.A. Lindqvist T. Warsaw Univ. Badelek B. Ciborowski J. Nassalski J. Rondio E. Sandacz A. Wuppertal Univ. Korzen B. Pavel N. Pietrzyk U. Spokesman: Rith, K. Contactman: von Harrach, D. The experiment will study deep inelastic muon nucléon scattering in a wide range of Q2 (1 — 200 (GeV/c)') and x (0.005 — 0.75). The main aims of the experiment are: a) Detailed measurements of the nuclear dependence of the structure function F2A, of R = a, /aT and of the cross - section for J/^ production. They will provide a basis for the understanding of the EMC effect: the modification of quark and gluon distributions due to the nuclear environment. b) A simultaneous high luminosity measurement of the structure function F2 on hydrogen and deuterium. This will provide substantially improved accuracy in the knowledge of the neutron structure function n n n 2 F2 , of F2P-F2 and F2 /F2P and their Q dependence. Furthermore, the data will allow a 2 determination of the strong coupling constant <*S(Q ) with reduced experimental and theoretical uncertainties as well as of the ratio of the down to up quark distributions in the valence region. Due to the large x range covered by the experiment the validity of the Gottfried sum rule and of the assumption of a flavour symmetric sea can be tested. The apparatus is the upgraded forward spectrometer which was used in the past by the European Muon Collaboration in experiments NA2, NA9 and NA28. References SPSC8S- 18 P210 115 lARCCT REGION BEAM Q * 0 SO 100 ISO 200 en Active URGE! CARBON A8S0RBCR CAS60M ABSORBER s - -S 10- -to E-M CAL 15- •li c* I* Fig. 1 The proposed layout: the NA10 sœctrcineter (top), front view of its main components (middle), target region (bottom — note scale! Q = ouartz, Pb/Sc are Pb and scintillating fibre struc- tures) . Experiment NA38: Study of High~Energy Nucleus-Nucleus Interactions with the Enlarged NA10 Dimuon Spectrometer IONS/DIMUON NA38 Approved 12/SEP/1985 Status Preparation Study of High - Energy Nucleus - Nucleus Interactions with the Enlarged NA10 Dimuon Spectrometer Bergen Univ., CERN, Clermont-Ferrand Univ., Lisbon NatJnstSciJies., Lyon Univ., Neuckatel Univ., Orsay IJ>JV., Palaiseau EeJPofy. LJPJVJIJE., Strasbourg/CJtJV., Valencia Univ. Bergen Univ. Iversen P.S. CERN Sonderegger P. Clermont-Ferrand Univ. Baldit A. Castor J. Fargeix J. Force P. Landaud G. Peyrard G. Lisbon Nat.lnst.Scl.Res. Barreira G.P. Bordalo P. Casaca A. Gago J.M. Maio A. Pimenta M. Ramos S. Valera J. Lyon Univ. Bedjidian M. Descroix E. Guichard A. Haroutunian R. Pizzi J.R. Neuchatel Univ. Perrin D. Orsay l.P.N. Gerschel C. Palaiseau Ec.Poly. L.P.N.H.E. Borensteir S. Busson P. Chaurand B. Kluberg L. Romana A. Salmeron R. StrasbourgjC.R.N. Britz J. Gorodetzky P. Kraus L. linck I. Valencia Univ. Velasco J. Spokesman: Kluberg, L. Contactman: Sonderegger, P. We propose to study dimuon production in 16O-238U collisions at the maximum expected luminosity (2 x 107 interactions per pulse), using the NA10 spectrometer to which we add beam counters, an active segmented target and an electromagnetic calorimeter. Thermal dimuons are expected to be emitted from a quark —gluon plasma at a reasonable rate in the 1 — 3 GeV/c2 transverse mass range, and to differ from ordinary dimuons by their pj and rapidity distribution. The correlations of the dimuon variables with charged multiplicity and neutral energy flow distributions will be studied event by event. The energy density is estimated directly from the transverse neutral energy. Prior to the oxygen runs, p—338U collisions will be studied in the same apparatus with the twofold purpose of optimizing the layout and of establishing a data base suitable for extrapolation to 16O- 238U collisions, deviations from which will then signal collective effects. A fraction of the data will be taken with lighter targets, in order to extend the Drell—Yan systematics to nucleus—nucleus reactions. The apparatus is able to make full use of any (heavier) ion beam of comparable product z x particle flux. Rrftrmca SPSC,{J5-20//P2n, SC/aS«/P21»/A Beam LSS5 Approved 29/JUN/1978 16/JUN/1983 15/SEP/1983 02/FEB/1984 15/NOV/1984 Status Data - Taking A 4 IT Solid Angle Detector for the SPS Used as a pp Collider at a Centre - of-mass Energy of 630 GeV Aachen TH, Amsterdam NIKHEF, Annecy LAJ*!*., Birmingham Univ., CERN, Harvard Univ., Helsinki Univ., Kiel Univ., London, Imperial College, London, Queen Mary College, Padova Univ., Paris College de France, U.C. Riverside, Rome Univ., Rutherford Appleton Lab., Saclay CEN DPhPE, Vienna, InstJi£nI>hys.(HEPHY), Wisconsin Univ. Aachen TH Eggert K, Erhard P. Faissner H. Grassmann H. Leuchs R. Moser H. Radermacher E. Redelberger T. Reithler H. Tscheslog E. Amsterdam NIKHEF Dorenbosch J. Holthuizen D. Van Eijk B. Annecy L.A.P.P. Aubert B. Catz P. Colas J. Ghez P, Gonidec A. Lees J.P. Linglin D. Minard M.N. Mours B. Perrault C. Vialle J.P. Wingerter I. Yvert M. Birmingham Univ. Corden MJ. Cox G. Dowell J.D. Edgecock R. Ellis N. Garvey J. Homer R.J. Kenyon I.R. Me Mahon T. Streets J. Watkins P. Wilson J. CERN Bezaguet A. Bock R.K. Cennini P. Cittolin S. Delia Negra M. Demoulin M. Duchovni E. Hoffmann H.F. Jank W. Jorat G. Kienzle W. Levi M. Locci E. Maurin G. Meyer O. Meyer T. Moricca M. Muller T. Naumann L. Norton A. Pauss F. Placci A. Porte J.P. Raja R. Revol J.P. Rossi P. RubbiaC. Sass J. Schinzel D. Sumorok K.C.T.O. Vuillemin V. Von der Schmitt H. Wilcke R. Winpenny S. Wyatt T. Harvard Univ. Geer S. Goodman M. Kroll J. RohlfJ. Schwartz A. Helsinki Univ. Karimaki V. Kinnunen R. Pietarinen E. Pimia M. Tuominiemi J. Kiel Univ. AHkofer O.C. Dau D. Levergrun S. London, Imperial College Siotis I. Virdee T.S. London, Queen Mary College Batley R. Buckley E. Eisenhandler E. Gibson W.R. Honma A. Kalmus P. Kyberd P. Thompson G. Von SchlipDe W. Padova Univ. Bettini A. Busetto G. Centro S. De Giorgi M. Meneguzzo A. Pascoli D. Zotto P.L. Paris College de France Dobrzynski L. Fontaine G. Ghesquiere C. Giraud - Heraud Y. Kryn D. Mendiburu J.P. Sajot G. Tao C. VranaJ. U.C. Riverside Frey R. Kernan A. Morgan K. Pitman D. Ransdell J. Sheer 1. Smith D. Rome Univ. Bacci C. Ciapetti G. Ceradini F. Di Ciaccio A. Lacava F. Paoluzi L. Piano - Mortari G. Salvini G. Zanello L. Rutherford Appleton Lab. Albrow M. Arnison G. Denby B. Flynn P. Grayer G. Haynes W.J. Nandi A.K. Scott W.G. Shah T.P. References SPSC/78-6/P92, 78-141/M142, 78-158/M146. 80-101/M260, SPSC/81 -58/P 92/Add.l, SPSC/82-19yM320. SPSCj82-51i1>92/Add.2, SPSC/83-43/M3S9, SPSC/83 -48/P92/Add.3, SPSC/83 - 79/P92/Add. 4, SPSC/84-46/M378, SPSC/84-84/M393. SPSC/84 - 85/M394, SPSC/84 - 88/M397, SPSC/85-12/M402, SPSC/84 - 72/P92/Add,5, SPSC/85-57/M41S 119 UA1 Saclay CEN DPhPE Cochet C. Colas P. De Beer M. Denegri D. Givenuud A. Laugier J.P. Leveque A. Savoy - Navarro A. Stubenrauch C. Verecchia P. Zaganidis N. Vienna. Inst.H.En.Phys.(HEPHY) Fruhwirth R. Markytan M. Strauss J. Szoncso F. Wahl H. Wulz C. Wisconsin Univ. Bauer G. Cline D. Markiewicz T. Mohammadi M. Stenzler M. Summers D. Victoria Univ. Astbury A. Keeler R. Keeler M. Sobie R. Spokesman: Rubbia, C./Leveque, A. Contactman: Maurin, G. pp collisions in the S PS open up an energy domain in which new and fundamental phenomena should emerge. The experiment has already shown evidence for intermediate bosons and yielded a few events consistent with the existence of the top quark. Higgs boson(s) could also be produced in detectable quantities at high luminosities. Significant investigations can be carried out on quark—quark interaction through high pj jets and Drell—Yan mechanism. Gluon interactions may be observed. In this new energy domain even "conventional" hadron physics takes on a renewed interest, especially in view of the possible change of regime suggested by cosmic—ray experiments. The apparatus to study these phenomena covers essentially all of the solid angle (down to —2°). The core of the apparatus is a conventional dipole magnet (7 kG) whose inner volume is occupied by a multiparticle detector, 6 m long and 1.3 m in radius, surrounded by a high — precision electromagnetic calorimeter. Hadron calorimetry is built inside the iron of the magnet, which also serves as a muon filter. Extra iron walls, magnetized and instrumented with planes of Iarocci tubes, provides an additional filtering of muons between the magnet and the muon chambers. A high precision vertex detector also surrounds the vacuum chamber of the collider. In this way all the hadrons and charged leptons can be measured and electrons and muons distinguished from hadrons. The electron and hadron calorimeters provide triggers for selection of intermediate bosons, heavy flavour and jet studies. 121 Coupe BB C J Experiment UA2: Study of Antiproton-Proton Interactions at 540 GeV cm. Energy UA2 Beam LSS4 Approved 14/DEC/1978 13/SEP/1984 07/FEB/1985 Status Data—Taking Study of Antiproton - Proton Interactions at 540 GeV cm. Energy Bern Univ., Cambridge Univ., CERN, Copenhagen Niels Bohr lnst., Heidelberg Univ., Milan Univ./INFN, Orsay Linear Ace. Lab. (LÂL), Pavia Univ., Perugia Univ., Pisa Univ./INFN, Saclay CEN DPhPE Bern Untv. Borer K. Hahn B. Hara K. Hugentobler E. Mani P. Moning R. Schacher J. Stocker F. Cambridge Univ. Ansorge R. Katvars S. Munday D.J. Rushbrooke J. Tsang W. White T. CERN Bagnaia P. Borghini M. Booth C. Cenci P. Clark A.G. Darriulat P. Di LelJa L. Einsweiler K. Fabre J.P. Gildemeister O. Goessling C. Haenni H. Hansen J,R. Harnew N. Jenni P. Mapelli L. Meier K.H. Onions C. Parker A. Petridou C. Rasmussen L. Swartz M. Tovey S. Weidberg A. Copenhagen Niels Bohr Inst. Dines-Hansen J. Hansen P. Kofoed- Hansen O. Madsen B. Mollerud R. Heidelberg Univ. Bcrnlohi K. Jacobs K. Kluge E.E. Plothow H. Putzer A. Schloetelburg M. Tittel K. Wunsch M. Milan Univ.jlNFN Bonesini M. Cavalli D. Costa G. Mandelli L. Mazzanti M. Perini L. Orsay Unear Ace. Lab. (LAL) Chollet J.C. De Lotto B. Fayard L. Froidevaux D. Gaillard J.M. Iconomidou L. Merkel B. Moniez M. Parroux G. Repellin J.P. Sauvage G. Pavia Univ. Conta C. Ferrari R. Fraternali M. Goggi V. Livan M. Pastore F. Rimoldi A. Vercesi V. Perugia Univ. Eattiston R. Cenci P. Codino A. Mantovani G.C. Pepe M. Pisa Univ./INFN Carboni G. Cavasinni V. Costanlini F. Del Prête T. lacopini E. Lariccia P. Morganti M. Valdata—Nappi M. Saclay CEN DPhPE Banner M. Bareyre P. Bonamy P. Bourdinand M. Lançon E. Loucatos S. Mansoulie B. Meyer J.P. Polverel M. Roussarie A. Teiger J. Zaccone H. Spokesman: Darriulat, P. Contactman: Darriulat, P. The purpose of this experiment is to detect the production and decay of W± and Z° bosons at the SPS pp facility. The design of the apparatus combines large solid angle coverage, with compactness and simplicity of operation. It includes electn magnetic and hadronic calorimetry in the central region and magnetic spectrometers in the forward Jid backward cones equipped for electron detection. These spectrometers will be replaced by calorimetors when ACOL will start operation. References SPSC/78-8/P93, 78 - S4/P 93/Add. 1, 78-126/M139, 78-133/M141. 78-162/M147, 79-27/M1S5, 80-96/M255, 80-104/M 255/Add.l. SPSC/81-78/M 301, SPSC/82-50/M335, SPSC/82 - 50/M335, SPSC/82 -54/M337, SPSQ/82 - SS/T24. SPSC./84-37/M377, SPSC/84-30/P93/Add.2, SPSC/84-86/M395, SPSC/85-3/M399, SPSC84-9S'P93/Add.3. SPSC/85-SS/M413. SPSC/85-S6/M414 123 forward chamber central chamber forward chamber i Detectors placed inside & outside the beam ^ f ^ pipe Detectors placed outside the chambers PLASTIC LAYER DETECTOR — — »._ Scale 1/50 Experiment UA3: Search for Magnetic Monopoles at the pp Colliding Ring UA3 Beam LSS5 Approved 14/DEC/1978 Status Completed DEC/1983 Search for Magnetic Monopoles at the pp Colliding Ring Annecy LAJJP., CERN Annecy L.A.P.P. AubertB. ViaUeJ.P. CERN Musset P. Price M.J. Contactman: Price, M J. The aim of this experiment is to investigate the existence of particles carrying isolated magnetic charges at the pp colliding ring. Such particles can be detected by solid state track detectors placed in a magnetic field and developed by subsequent chemical etching. In order to avoid possible interactions with matter, the detection is simultaneous with the production and presence of substance is suppressed to the greatest possible extent between the production region and the detectors. A good sensitivity over a large range of magnetic charge values, the natural unit of which is the Dirac change g = hC/4we is an important feature of the design. The high energy available at the pp colliding ring allows to reach high mass values. Detailed study of the quality of the vacuum permitted to install detectors directly inside the vacuum pipe. Other detectors are being installed inside the UA1 apparatus. Rtftrtnces SPSC/78 -15/P 96, 78 - 74/M 116 SOE VIEW Of A POT Silicmm stnp layer Proportlonal Trigger counter plane Experiment UA4: Measurement of Elastic Scattering in the Coulomb Interference Region at the CERN pp Collider COULOMB UA4 Beam LSS4 Approved 18/JAN/1979 29/MAR/1984 Status Completed 18/JUN/1985 Measurement of Elastic Scattering in the Coulomb Interference Region at the CERN pp Collider Amsterdam NIKHEF, CERN, Genova Unh.lINFN, Naples Univ.lINFN, Palaiseau EcJ'ofy. LJPJVJI£., Pisa Unh.flNFN Amsterdam NIKHEF Koene B. Timmermans J. Van Swol R. CERN Bernard D. Genova Univ./INFN Bozzo M. Sette G. Naples Univ./INFN Carbonara F. Chiefari G. Drago E. LarujjioS. Matthiae G. Merola L. Napolitano M. Palladino V. Sciacca G. Visco F. Palaiseau Ec.Pofy. L.P.N.H.E. Badier J. Haguenauer M. Innocente V. Pisa Univ.lINFN Braccini P.L. Castaldi R. Cervelli F. Sanguinetti G. Scapellato S. Vannini C. Verdini P.G. Valencia Univ. Velasco J. Spokesman: Matthiae, G. Contactman: Haguenauer, M. The aim of the experiment is to measure elastic scattering and the total cross - section at the pp collider. Up to 1983 the experimental apparatus was composed of two parts : 1) Telescopies of high accuracy drift and proportional chambers and counters inserted into vertically moveable sections of the vacuum chamber ('Roman pots'), detect elastic scattering in the angular region from .5 mrad up to about 3 mrad. 2) The total inelastic rate is measured with a forward/backward system of drift chambers and counter hodoscopes and the UA2 central detector covering together =* 4*7 solid angle. With these two set - ups, the measured value of the total cross - section confirms extrapolation with (hi s)2 behaviour. Elastic scattering and diffraction dissociation were measured in the range .03 < -t < 1.6 GeV2. From 1984 on, six horizontally moveable "Roman Pots" have been installed farther away from the intersection region (up to 100 m). Using an especially designed beam optics and the same detection set — up, the elastic scattering is measured down to . 1 mrad. This will allow to determine the parameter p (ratio of the real to the imaginary part of the forward elastic amplitude) and pennit to predict the energy trend of the total cross — section in the multi — TeV region. References SPSC/78-U/I 100, 78-105/P114, 79- 10/P 114/Add.l, 80- 14/P114/Add.2, 80-59/M236, SPSC/82-66/M340, SPSC/84 - 7/P114/Add.3, SPSC/84 - 74/M389 127 SCHEMATIC LAYOUT OF THE STREAMER CHAMBER SYSTEM FORWARD HODOSCOPE 2 SIDE HODOSCOPE 5m FORWARD HODOSCOPE 1 Experiment UA5/2: An Exploratory Investigation of pp Interaction at 800-900 GeV cm. Energy at the SPS Collider STREAMER UA5/2 Beam LSS4 Approved 03/FEB/1983 Status Completed 04/APR/1985 An Exploratory Investigation of pp Interaction at 800-900 GeV cm Energy at the SPS Collider Bonn Univ., Brussels, IIHE, Cambridge Univ., CERN, Stockholm Univ. Bonn Univ. Boeckmann K. Burow L. Drees A. Eckart B. Eyring A. Froebel L. Geich - Gimbel C. Hall B. Hospes R. Kokott T.P.K. Langer M. Meinke R.B. Pelzer W. Schmickler H. Brussels, IIHE De Clercq C. Gaudaen J. Van Hainme L. Wilquet G. Cambridge Vniv. Ansorge R.E. De Wolf R.S. Munday D.J. Ovens J. Rushbrooke J.G. Ward C.P. Ward D.R. Webber C.J.S. White T.O. CERN Alner GJ. Chevalley J.L. Evangelou I. Fabre J.P. Gareyte J. Mackenzie R. Triantis F. von Holtey G. Vos L. Weber G. Stockholm Univ. AJpgard K. Asman B. Carlson P. Bkspong G. Fuglesang C. Jon And K. Lotse F. Walck C. Yamdagni N. Spokesman: Rushbrooke, J.G. Contactman: Munday, DJ./Eyring, A. The UA5 detector consists of two large (6 x 1.25 x 0.5 m3) streamer chambers covering nearly 4w in solid angle and viewed via image intensifies by six stereo cameras, together with scintillation counter hodoscopes for triggering and a calorimeter at 90° covering approximately ATJ =* 1.5 units. The detector has already been used for an investigation of hadron physics at 540 GeV at the SPS pp Collider. Topics studied included the charged particle multiplicity distribution and its moments; KNO scaling; rapidity distributions of charged particles and protons; production of strange particles; short —and long—range correlations. A search for Centauro events proved negative. These investigations have been continued at 900 GeV at the SPS Collider operated successfully for the first time in a new pulse mode in early 1985, when large quantities of data were obtained. The purpose was to perform an exploratory survey of hadron physics at the highest available energy. The energy dependence of, for example, the scaling violation seen at 540 GeV is being studied at energies between 200 GeV and 900 GeV in the same experiment. A main aim is to continue the search for unusual events seen in cosmic ray experiments, for example the so —called Centauro events: for this purpose a lead converter plate was inserted between the beam—pipe and upper streamer chamber for part of the data-taking to improve photon detection efficiency. References SPSC/82-75/P184 129 V^ Fig. A3 Perspective view of the set-up in ;i medium lonp str.iij;lit section of the SI'S. ;.-.r Experiment UA6: An Internal Hydrogen Jet Target in the SPS to Study Inclusive Electromagnetic Final State and A Production in pp and pp Interactions at /s = 24.3 GeV Beam INTER Approved 23/APR/1981 Status Data—Taking An Internal Hydrogen Jet Target in the SPS to Study Inclusive Electromagnetic Final States at Large Transverse Momentum and A Production in pp and pp Interactions at ^/s = 24.3 GeV CERN, Lausanne Univ., Michigan Univ., Rockefeller Univ. CERN CamilJeri L. Dick L. Dukes E.C. Kubischta W. Vacchi A. Lausanne Univ. Baumann S. Bernasconi A. Berney J.C. Gabioud B. GaiUe F. Joseph C. Loude J.F. Morel C. Perroud J.P. Sozzi G. Steiner D. Tran M.T. Michigan Univ. Overseth O.E. Valenti G. Rockefeller Univ. Breedon R.E. Cool R.L. Cox P.T. Rusack R.W. Snow G.A. Lund Univ. Von Dardel G. Spokesman: Joseph, C./Dick, L. Contactman: Camilleri, L. 30 2 1 The H2 cluster jet target will allow a pp and pp luminosity of L = 5 x 10 cm~ s~ to be reached, running in parallel with the pp collider experiments. The apparatus consists of a forward double — arm spectrometer with high resolution wire chambers and electromagnetic calorimeters. The purpose of the experiment is to measure, in both pp and pp interactions: a) Hard scattering processes such as — single and double y production — large mass electron pair production — high pj inclusive IT0 production b) A and A polarization at large angle c) low — t elastic and inelastic cross — sections using a set of solid state counters placed at 90° (LAB). This measurement will also provide an accurate luminosity monitor. References SPSQ80 - 63 SPSC. P 148, SPSC/8)-9/M 278, SPSC/84-81/M391, SPSC/84 -87/M396, SPSC/8S-69/M418 131 1/1 PI O "0 fO M (0 9 rt g S A n (0 oCO CO to C CO A A n n I3 t** rt o 3 cr m O t-n CO r =S H o OH- 70 o n o 9 3 H» rt CA rt 3" (D O O. A n •i ^(XXXXXXXXXXXXXXXXXX O O CO A (D rt A rt O O rt O N to 0 o O Ml a rt 0m0 3* A (D A M 3 Q> H' 01 3 PIZEROS UA7 Beam LSS4 Approved 18/APR/1985 Status Data - Taking Measurement by Silicon Shower Detectors of the Invariant Cross Section of v° Emitted Close to Zero Degree Japan U.G., Naples Untv.lINFN Japan U.G. Doke T. Kasahara K. Kashiwagi T. Kikuchi J. Masuda K. Murakami H. Muraki Y. Nakada T. Nakamoto A. YudaT. Naples Untv.jlffFff Innocente V. Lanzano S. Palaiseau Ec.Pofy. L.P.N.H.E. Haguenauer M. Spokesman: Muraki, Y. Contactman: Haguenauer, M. The invariant cross section and the transverse momentum of w° produced at large Feynman Xp will be measured in pp interactions at y/s = 630 GeV. For this purpose finely segmented silicon shower calorimeters are placed inside the Roman pots located 25 m from the interaction vertex and between the D3 drift chambers of UA4. Sufficiently large statistics will be accumulated in a run parasitically to the low-/? UA1/2 running. This experiment will clarify a long riddle of cosmic ray physics; whether the Feynman scaling does violate at the fragmentation region or the iron component is increasing in the 10ls eV region. Rtftrtncts SPSC/S4-4/P195 Rev., SPSC/S5- 14/P195/Add.l 133 UA2 C QY QY C C QX QX C 1 I I I v 1 I | | 12m- 22m- 25m- 34m- C = Chambers OY = Vertical Focusing Quads QX = Horizontal Focusing Quads Experiment UA8 : Study of Jet Structure in High Mass Diffraction at the SPS Collider DIFFRACTION UA8 Beam LSS4 Approved 18/APR/1985 Status Installation Study of Jet Structure in High Mass Diffraction at the SPS Collider U.CJ.A. U.C.L.A. Bonino R. Castellina A. Cheze J.B. Erhan S. Medinnis M. Schlein P. Zsembery J. Zweiaig J. Spokesman: Schlein, P. Contactman: Medinnis, M. The aim of the experiment is to study the class of events which have a quasi — elastic recoil proton or antiproton (with Xp > 0.9) and also large transverse energy (hadronic and/or electromagnetic). The trigger is a minimum transverse energy in the UA2 calorimeter system and a diffractive recoil proton signature in a system of "Mini — Drift" wire chambers installed symmetrically in Roman—pots on both sides of LSS4. In single diffractive events of the type: pp -*• p + X + c.c. the system X is believed to result from a Pomeron—proton collision Pp -*• X. We will study the energy flow in the UA2 detector and search for jet structure in high mass difiraction at yjs = 630 GeV in order to elucidate the nature of the Pomeron and its possible parton structure. Observation of electrons with high transverse momentum in coincidence with leading protons will signal the production of heavy flavor in high mass diffraction. In order to efficiently select high — mass diffractive events at the highest luminosities to be available, the momentum of the proton will be calculated in real time for use in a second —level trigger. References SPSC/84-82/P208, SPSC/8S-2/P208/Add.l 135 II D = 2.0cm iÎBi iïifi t GLASS Emulsion SSSS 1mm ~~: THICK mu mu iîfn ••>• !•••• *••• \immi ssss: M Il i l •!**•] •• .* * % t sm \\; IIK; mil 1 t Track A "^Track B 600um Side view of part of emulsion chamber with simulated central 16O + Ag interaction. D= 2.0cm Projection in a plate 2 cm downstream. Field of view is 500 \tm. Experiment EMU01: Study of Particle Production and Nuclear Fragmentation in Collisions of 16O Beams with Emulsion Nuclei at 13-200 A GeV Approved 15/NOV/1984 Status Preparation Study of Particle Production and Nuclear Fragmentation in Collisions of 16O - Beams with Emulsion Nuclei at 13 -200 A GeV Beijing HJÏJ'Jnst., Jaipur, Rajasthan Univ., Jammu Univ., Lawrence Berkeley Lab., Lund Univ., Ottawa NatJies.Coundl, Ottawa Univ., Shanxi Normal Univ., Tashkent, LHEP Phys.TechJnst., Washington Univ. Seattle, Wuhan, Hua—Zhong Normal Univ. Beijing H.E.P.Inst. Zheng P.Y. Jaipur. Rajasthan Univ. BhallaK.B. Kumar V. Lokanathan S. Jammu Untv. PrakashY. Rao N.K. Lawrence Berkeley Lab. Friedlander E. Heckman H.H. Karant Y. Lund Univ. Garpman S. Herrstrom N.Y. Jakobsson B. Lund I. Noren B. Otterlund I. Persson S. Stenlund E. Soderstrom K. Ottawa Nat.Res.Council Judek B. Ottawa Univ. Hébert C.J.D. Hébert J. Shanxi Normal Untv. Sun J.R Tashkent, LHEP Phys.Tech.Inst. Asimov S.A. Chernov G.M. Gulamov K.G. Guliamov G. Nawotny W.S. Washington Univ. Seattle Burnett T.H. Lord J.J. Wilkes R.J. Wuhan, Hua - Zhong Normal Untv. CaiX. LianL.S. Spokesman: Otterlund, I. Contactman: Vanderhaeghe, G. The aim of the experiment is to study, on an event by event basis, multiplicities of produced charged particles, pseudo — rapidity density distributions globally and in selected regions of pseudo—rapidity, density fluctuations, multiplicity and angular distributions of nuclear fragments and recoiling protons (30 — 400 A MeV) and cross sections for production and Alteration of light and medium (Z = 2—8) projectile fragments. The detectors will be emulsion chambers as well as conventional emulsion stacks. The emulsion chambers consist of several layers of a plastic substrate, each coated with nuclear emulsion on both sides. Since the best measurement accuracy is obtained for the particles with the smallest emission angles, this design is especially suited for the pseudo —rapidity determination. The emulsion stacks, of both high and low sensitivity, will be exposed in the conventional way, with the beam parallel to the emulsion sheets. These stacks will be used in the study of the nuclear break up. References SPSC/84-27/P198 137 plastic detector sheets 0 beam 5 cm Experiment EMU02: Search for Fractionally Charged Nuclei in High-Energy Oxygen-Lead Collisions IONS EMU02 Approved 15/NOV/1984 Status Preparation Search for FractionaUy Charged Nuclei in High-Energy Oxygen—Lead Collisions U.C. Berkeley, CERN U.C. Berkeley Price P.B. CERN Vanderhaeghe G. Spokesman: Price, P.B. Contactman: Vanderhaeghe, G. We propose to use stacks of CR—39 plastic track detectors to look for fractionally charged projectile fragments produced in collisions of high—energy oxygen, sulfur, and calcium nuclei with a lead target. The expected charge resolution is oz = 0.06e for fragments with 17e/3 < Z < 23e/3. We request that three target + stack assemblies be exposed to 1 x 10s oxygen, sulfur, and calcium nuclei at maximum available energy. References SPSC/84-38/P201, SPSC/8S - 38/M408 139 IONS EMU03 Approved 15/NOV/1984 Status Preparation Interactions of 16O Projectile and its Fragments in Nuclear Emulsion at about 50 and 225 GeV/nucIeon Cairo Univ. Cairo Univ. BadawyO.E. Ghoneim M.T. El-Hamalawy A. Moharram Z. Mossaad M. Moussa A. Moussa N. Moussa Z.A. El-NadiM. El-NagdyM. Osman O. Sadek N.M. EI-Shawarby A. El-SourogyA. Rashid N. Riad M. Spokesman: Badawy, O.E. Contactman: Vanderhaeghe, G. The aim of the proposed experiment is to measure the multiplicity *n * and pseudo—rapidity "T\" of s the shower particles (/? > 0.7) produced in different types of interactions (peripheral, semi—central and central collisions) of 16O ions in nuclear emulsions. Density fluctuations, if detected, will be a good signal for quark-feluon plasma formation. The angular distribution of grey particles (mainly due to knock —on and recoil protons) and the dependence of shower multiplicity upon their number are expected to shed some light on the reaction mechanism. The yield and angular distribution of the produced relativistic projectile fragments will be measured and the temperature of their emitting sources will be determined. The projectile fragments, especially those with Z = 2, will be followed through the emulsion stacks in order to detect any short mean free path (anomalon effect) and to compare it with our previous results. A study, on an event by event basis, of the associated stars for the detection of lepton pairs besides any unusual behaviour of other parameters will enable to observe signals of Q.G.P. which may explain the nature of anomalons. References SPSC/84-77/P207 141 PS STATUS OF THE PS PROGRAMME AS OF NOVEMBER 1985 143 FAR DETECTOR (~900m) NEAR DETECTOR FAR DETECTOR __ , H r— r— r— ^5cm J «15 cm-» 2.5 cm 5 cm I5cm cm "** IRON SAMPLING THICKNESS IRON -SCINTILLATOR CALORIMETER MODULES 5 m Experiment PS169: Search for Neutrino Oscillations PS 169 Approved 16/OCT/1980 Status Completed MAR/1983 Search for Neutrino Oscillations CERN, Dortmund Univ., Heidelberg Univ., Saclay CEN DPhPE CERN Dydak F. Feldman G. Guyot C. Hagelberg R. Ranjard F. Steinberger J. Tauieg H. Von Rueden W. Wahl H. Wotschack J. Dortmund Univ. Bluemer H. Buchholz P. Duda J. Eisele F. Kleinknecht K. Knobloch J. PoIImann D. Pszola B. Renk B. Heidelberg Unit. Beiuseric R. Falkenburg B. Flottmann T. Geweniger C. Keilwerth H. Tittel K. Saclay CEN DPhPE Debu P. Merlo J.P. Para A. Perez P. Rander J. Schuller J.P. Turlay R. Warsaw Insl.Nucl.Res. Abramowicz H. KrolUcowski J. Washington Univ. Seattle Rothberg J.R. Hamburg DESY Meyer H.J. Spokesman: Wotschack, J. Contactman: Wotschack, J. This experiment measures the disappearance rate of muon neutrinos between two distances from their production point. The muon neutrino flux at 130 m and 870 m has been measured simultaneously using charged current events as a signature. The detector at the far position is the improved CDHS iron — scintillator calorimeter consisting of 21 modules with either 2.5 cm, 5 cm, or 15 cm iron sampling thickness. The detector at the near position consists of 6 modules identical to those installed at the far position and with the same ordering. Event rates in identical modules at the two positions will be compared. The muon neutrinos are produced in a 19.2 GeV/c "bare target* beam at the new low energy PS neutrino facility. The neutrino energy is 0.5-3 GeV/c. The flux varies with distance L approximately as 1/L2 permitting reliable calculation of the flux ratio at the two detector positions. The experiment is sensitive to a neutrino mass difference, fimz = 0.25 eV2, assuming maximal mixing, for the transition of muon neutrinos into any other type of neutrinos. References PSCC/80 - 106/P 30 145 immmm SD SD DT C mmmmmmm H2 H1 pliilliiil CD j a. Side view 1m b. Top view Experiment PS170: Precision Measurements of the Proton Electromagnetic Form Factors in the Time-like Region & Vector Meson Spectroscopy LEAR/FORMFACTOR PS 170 Beam LEAR Approved 27/NOV/1980 Status Data — Taking Precision Measurements of the Proton Electromagnetic Form Factors in the Time - like Region and Vector Meson Spectroscopy Ferrara Univ., Padova Univ., Saclay CEN DPhN, Saclay CEN DPhPE, Torino Univ. Ferrara Univ. Calabrese R. DaJpiaz P. DaJpiaz P.F. Petrucci F. Savrie M. Padova Univ. Carlin R. Dosselli U. Gasparini F. Limentani S. Posocco M. Voci C. Saclay CEN DPhPE Burgun G. Derre I. Kochowsky C. Lafarge D. Mare! G. Pauli E. Saclay CEN DPhN Bardin G. Duclos J. Faure J.L. Huet M. Torino Univ. Tecchio L. CERN Mazzucato E. Spokesman: Dalpiaz, P. Contactman: Duclos, J. The aim of this experiment is to measure with precision the electromagnetic form factors of the proton in the time — like region via the reaction: pp - e+e" with antiprotons of momenta between 0 and 2 GeV/c. Up to = 800 MeV/c, a continuous energy scan in ^ 2 MeV (y/s) bins will be performed. The form factor |G(E)| and |G(M)| will be determined separately since large statistics can be collected with LEAR antiproton beams, so that angular distributions can be obtained at many momenta. In addition, e+e~ pairs produced via the reaction: pp -• V° + neutrals, |- e+e~ where the antiprotons are at rest, will be detected allowing the vector meson mass spectrum between =* 1 GeV and ^1.7 GeV to be obtained with high statistics and in one run. The proposed apparatus consists of a central detector, surrounded by a gas Cerenkov counter, wire chambers, hodoscopes, and an electromagnetic calorimeter. The central detector consists of several layers of proportional chambers around a liquid — hydrogen target in the vertical field of a C—magnet. A V° mass resolution of the order of 2% is expected. The Cerenkov counter together with the calorimeter will provide an efficient detection for e+e~ pairs with a rejection power against hadron pairs of a least 1010 p. With the LEAR extracted beam, the expected rates should vary between 5000 events at rest and 10 events at 2GeV/cfor 1011 p. References 80-9S/PSSC.P25, 80 - 119/PSCC/M 67, PSCC/82-81/M140, PSCC/83 -40/M166, PSCC/85 - 62/M237 147 Experiment PS171: Study of pp Interactions at Rest in a H2 Gas Target at LEAR LEAR/ASTERDC PS 171 Beam LEAR Approved 27/NOV/1980 Status Data—Taking Study of pp Interactions at Rest in a H2 Gas Target at LEAR CERN, Mainz Univ., Munich Univ., Orsay Linear Ace. Lab. (LAL), Vancouver Univ., Victoria Univ., Vienna, Inst Jtadiumforschung+Kernphysik, Zurich Univ. CERN Armenteros R. Bailey D. Barlag S. Gastaldi U. Malm Univ. Duch K.D. Heel M. Kalinowsky H. Kayser F. Klempt E. Landua R. Schreiber O. Straumann U. Ziegler M. Munich Univ. Dahme W. Feld F. Schaefer U. Wodrich R.W. Orsay Linear Ace. Lab. (LAL) Bizot J.C. Delcourt B. Jeanjean J. Nguyen H. Prevot N. Vancouver Univ. Auld E.G. Axen D.A. Comyn M. Erdman K.L. Howard B. Howard R. Marshall G. White B.L. Victoria Univ. Beer G.A. Robertson L.P. Vienna, Inst.Radiumforschung+Kernphysik Botlo M. Laa C. Vonach H. Zurich Univ. Amsler C. Doser M. Riedelberger J. Truol P. Geneva Univ. Sabev C. Spokesman: Klempt, E. Contactman: Gastaldi, U. ASTERIX(*J Collaboration This experiment studies pp strong interactions and qq, gg, qqqq, NN«oun A objects produced in pp annihilations at rest with a detection system of large acceptance that provides simultaneous information on both the initial atomic and final annihilation state. X-ray transitions to the IS, 2P, and 3D atomic levels of protonium (pp atom) are detected by the SPC projection chamber (J2/4w m 90%) which surrounds a Hz gas target at normal pressure, measures their energy and gives the three coordinates of the absorption point of each X—ray. Charged pp annihilation products are imaged by the SPC and their momentum is detennined by an upgraded version of the Orsay DM1 solenoidal magnetic spectrometer (Œ/4m » 50%, Ap/p =; ±3.5% p(MeV/c)/500). Position - sensitive gamma detection is given by converters and MWPC'S in the end caps (&/4w ^ 25%) and by a cylindrical lead converter before the two outermost spectrometer chambers (i2/4n- =* 50%). The detector is triggered on preselected initial and/or final state configurations. The objectives of the experiment are: protonium spectroscopy (X—ray transitions to the IS ground state and measurement of the shift AE and the width T of the singlet % and triplet ^ sub-levels, yields of M, L and K transitions), pp annihilation dynamics (comparison of branching ratios of annihilations in P- and S-wave), spectroscopy of qq" mesons, search for glueballs (gg, ggg), baryonium (qqqq) and quasi-nuclear NN bound states, and eventually spectroscopy of these objects. % - % - % (•) Antiproton STop Experiment with tRigger on Initial X-rays References 80-101/PSCC/P28, PSCC/82-43/M114, PSCC/82-43/M1H, PSCC/82-80/M139, PSCC/83-53/M172, PSCC/85-61/M236 149 I Carbon target / Dégrader on traversing table Focus Q1 Q2 M1 9c / M3 Collimator Cryostat Magnet yoke r = 70cm Carbon r=72cm \ rs5cm « ; polarized or unpolarized Trigger Beam scintillators Experiment PS 172: pp Total Cross-Sections and Spin Effects in pp -> K K , TT+TT", pp above 200 MeV/c LEAR/SING PS 172 Beam LEAR Approved 27/NOV/1980 Status Data—Taking pp Total Cross - sections and Spin Effects in pp - K+K", 7T+7T-, pp above 200 MeV/c Amsterdam N1KHEF, Geneva Univ., London, Queen Mary College, Surrey Univ., Trieste Univ. Amsterdam N1KHEF Blokzijl R. Bos K. Kluyver J. Kunne R.A. Linssen L. Geneva Univ. Degli - Agosti S. Heer E. Hess R. Lechanoine - Le Luc C. Onel Y. Rapin D. London, Queen Mary College Beard C.I. Bugg D. Hall J. Wells P. Surrey Univ. Clough A.S. Shypit R. Trieste Univ. Birsa R. Bradamante F. DaUa Torre S. Giorgi M. Martin A. Penzo A. Schiavon P. Tessarotto F. Villari A. Spokesman: Bugg,D. Contactman: Hess, R. The main objective of this proposal is a measurement of dff/dfi and P in pp -»• w+ir~ (1) pp-K + K- (2) PP - PP (3) in the momentum range 300 — 2000 MeV/c at about 15 different momenta using a conventional polarized target. In reactions (1) and (2) the complete angular range 0- 180° will be covered. Reaction (3) will be studied over the angular range where p and p have sufficient range to escape from the target. Statistics will be > 104 per momentum for reaction (2), and correspondingly higher for other channels. With the same set — up, two subsidiary measurements are possible. Firstly, at those energies and angles where the proton from reaction (3) has sufficient energy, a measurement of its polarization can be made parasitically to determine the Wolfenstein parameter D s I(0,n; 0,n). Secondly, if carbon has significant analysing power for antiprotons, the parameter Dt = I(0,n; n,0) will also be obtained. An important preliminary in deciding whether polarized p beams can be made by scattering from carbon, and also in devising a polarimeter for p polarization, is a measurement of the polarization of p scattered at small angles from C. This also can be done with existing equipment. The same small —angle set —up can be used to measure at a few energies the real part of the elastic scattering amplitude at |t| = 0. ooc mass res ut n Another part of this proposal is a measurement of atQt and °Pn"* neutrals ^^ S * °l i° (±0.4 MeV/c2 over the S region) and high statistics (±0.25%) and small steps of momentum (=* 10MeV/c) down to 200 MeV/c. The objective of this measurement is to look for narrow states. If any such narrow state is located, subsequent measurements of the two — body channels would be concentrated on this mass range in an attempt to determine quantum numbers. References 80-76/PSCC/P 16, 80-137/PSCC/P 16/Add.i, PSCC/82-75/M134. PSCC/83 -32/M163, PSCC/84-11/M181, PSCC/84-20/M186. PSCC/84-25/M191, PSCC/84-30/M193, PSCC/85-23/M222, PSCC/8S- 59/M234 151 -ANC ANC 0 m 0.5 Experiment PS173: Measurement of Antiproton-Proton Cross-Sections at Low Antiproton Momenta LEAR/CR.SEC. PS 173 Beam LEAR Approved 27/NOV/1980 Status Data-Taking Measurement of Antiproton—proton Cross - sections at Low Antiproton Momenta Heidelberg MPI, Heidelberg Univ., Laval Univ., Mainz Univ., Rutgers Univ. Heidelberg MPI Bruckner W. Dobbeling H. Dworschak K. von Harrach D. Paul S. Povh B. Treichel M. Heidelberg Univ. Nomachi M. ShibataT.A. Laval Univ. Cujec B. Maim Univ. Walcher T. Rutgers Univ. Ransome R. Spokesman: Walcher, T. Contactman: Shibata, T.A. The experiment is designed to measure four different cross sections in the momentum range 150 MeV/c to 600 MeV/c: 1) the differential elastic 2) the differential charge exchange 3) the annihilation into charged and neutral pions 4) and the total cross section via the optical theorem. The experiment allows one to search once again and with good precision for baryonium. Of special interest is the existence of the S —meson, for which a signal of about 20 MeV —mb was found in a 1981 experiment (performed in the East Hall). A second point of special interest is the momentum region below 300 MeV/c because the cross sections are basically unknown. We will be able to explore the momentum dependence of this region for the first time. The elastic cross section is measured by a cylindrical multiwire proportional chamber and a scintillator hodoscope placed around a scattering chamber under vacuum. The charge exchange cross section is measured by a ring of 32 anti—neutron detectors with a granularity of 5 deg. The annihilation cross section is determined by an arrangement of hodoscopes and lead glass detectors surrounding the scattering chamber. Liquid hydrogen targets of 20 mm and 5 mm thickness are used. References 80-8S/PSCC/P20. PSCC/82-73/M132. PSCC/84-1/M174, PSCC/8S-48/M232 153 Vertical movement S2 Counter of SI, 52. Relative scintillator to Target 100|i thick Pb Cave Thermal shield & X-ray collimator Nal Compton shield Retractable calibration source Si (Li) detector Cu Bar to He fridge 51 Counter 6|I Mylar window supported on Al Vacuum Al vessel Al Gas flask 0 10 20 30 40 cm Fig.1 .Schematic diagram of Target and Counters Experiment PS174; Precision Survey of X-rays from pp(pd) Atoms Using the Initial LEAR Beam LEAR/XRAYS PS174 Beam LEAR Approved 1 I/DEC/1980 Status Data-Taking Precision Survey of X - rays from pp(pd) Atoms Using the Initial LEAR Beam Amsterdam NIKHEF, Birmingham Univ., Delft Tech. Univ., Rutherford Appleton Lab., William and Mary College Wittiamsburg Amsterdam NIKHEF Lingeman E.W.A. Birmingham Untv. Davies J.D. Gorringe T. Lowe J. Nelson J.M. Pyle G.M. Selvarajah A. Squier G.T.A. Delft Tech. Univ. Van Eijk C. Hollander R. Obsc W.J.C. Rutherford Appleton Lab. Batty C.J. Sakamoto S. William and Mary College Williamsburg Welsh R.E. Winter R. Spokesman: Davies, J.D. Contactman: Lowe, J./Batty, C. The experiment searches for the K and L X — ray series from pp (pd) atoms, then measures their shift and width relative to QED predictions, and investigates their yields as a function of gas density. The p are stopped in 1 atmosphere of H2 (D2) gas in a large aluminium flask whose 1 mm wall thickness eliminates externally produced low energy X —rays. The gas is cooled from a remote helium refrigerator and its temperature varied between 30° K and 300° K, giving a density range of 10 and large changes in relative line intensities. With 300 mm2 area and 250 eV resolution FWHM at 5.9 keV, the Si(Li) X —ray detector penetrates the vacuum to come very close to a large beryllium window. Withstanding the large, charged particle flux from pp annihilations has required special development of the Si(Li) detector. High purity metals are used for flask, window and detector end —housing to reduce background X — ray lines. A Nal ring suppresses the continuum background that comes principally from Compton scattering in the Si crystal of 50-500 keV y -rays. References PSCC/80-81/PSCC/P18, PSCC/82-77/M136, PSCC/82-97/M148, PSCC/84-16/M186, PSCC/84- 17/M187, PSCC/84-43/M201, PSCC/85-8/M211, PSCC/8S - 75/M246 155 CURRENT LEAD, PROTECTION LEAD, SYPHON AND LEVEL GAUGE ASSEMBLY LIQUID HELIUM RESERVOIR PERSISTENT MODE SWITCH STAINLESS STEEL COIL SUPPORT STAINLESS STEEL PILLAR \ TITANIUM RADIAL SUPPORT 0 100 200mm LN2 COOLED RADIATION SHIELD TITAN AXIAL SUPPORT Experiment PS175: Measurement of the Antiprotonic Lyman- and Balmer X-rays of pH & pD Atoms at Very Low Target Pressures LEAR/CYCL.TRAP PS 175 Beam LEAR Approved ll/DEC/1980 Status Data-Taking Measurement of the Antiprotonic Lyman - and Balmer X - rays of pH and pD Atoms at Very Low Target Pressures Karlsruhe KJK / Univ. Karlsruhe KfK / Univ. Bâcher R. Bluem P. Gotta D. Koch H. Kunold W. Rohmann D. Schneider M. Simons L.M. Spokesman: Simons, L.M. Contactman: Koch, H./Rohmann, D. The aim of this experiment is to measure the energies and intensities of the n -» 1 (Lyman) and n -*• 2 (Balmer) tansitions with high accuracy in both pH and pD, from which the strong interaction effects of the Is— and 2p —level can be extracted. These observables may be related to the antiproton—proton and antiproton — neutron scattering length. Since in these targets collisional Stark effect occurs, we will stop the antiprotons in extreme thin gaseous targets (pressure as low as 10 Torr), where no Stark effect occurs and the 2—1 transition is favoured. In order to use antiprotons with high efficiency despite of the low target density, we will trap antiprotons of a momentum of 100 MeV/c in a magnetic field of cyclotron characteristics. The antiprotons are decelerated by their energy loss in the target gas. The focusing properties of the magnetic field serve to compensate the multiple scattering and we will end up with a concentrated stopping distribution at the centre. Due to the long orbiting time, background from the moderation is entirely separated in time from the atomic cascade. The energies of the X-rays will be measured by Ge— and Si(Li) —detectors in a double guardring reject configuration. Thus, background in the used energy range below 10 KeV can be reduced. References PSCC/80-99/PSCC/P27, 81 -24/P 27 Add. 1, PSCC/82-85/M144, PSCC/84-13/M183. PSCC/8S-67/M242 157 Experiment PS176: Study of X-ray and y-ray Spectra from Antiprotonic Atoms at the Slowly Extracted Antiproton Beam of LEAR LEAR/XRAYS PS 176 Beam LEAR Approved ll/DEC/1980 Status Data - Taking Study of X - ray and y - ray Spectra from Antiprotonic Atoms at the Slowly Extracted Antiproton Beam of LEAR Basel Univ., Karlsruhe KJK / Univ., Stockholm Univ., Strasbourg Univ., Thessaloniki Univ. Basel Univ. Backenstoss G. Findeisen C. Tauscher L. Karlsruhe KfK j Univ. Bluem P. Bueche G. Gotta D. Hancock D. Hauth J. Koch H. Koehler T. Poth H. Rohmann D. Stockholm Univ. Bergstrom I. Carius S. Nilsson A. Stockholm Res. lnst. Adiels L. Strasbourg Univ. Suffert M. Thessaloniki Univ. Charalambous S. Chardalas M. Dedoussis G. Zioutas K. CERN Kreissl A. Pavlopoulos P. Troester D. Wolf A. Spokesman: Poth, H. Contactman: Tauscher, L. This experiment will study the X —ray spectra of antiprotonic atoms and the gamma spectra of residual nuclei after the antiproton absorption. We intend to begin with measurements on selected isotopically pure targets. Strong interaction effects, the antiproton absorption and the atomic cascade are analysed through the measurement of energies, lineshapes, relative and absolute intensities of all observable lines. The experiments are continued to determine strong interaction effects in resolved fine structure levels and in different isotopes of the same element. Coincidence techniques may be applied. All components of the experimental set —up arc already existing from previous experiments and we could begin the measurements with any slowly extracted beam of low energy at LEAR. References PSCC/80 - 103/PSCC/P 29, PSCC/S2 -82/M141. PSCC/85 -70/M244 159 delayed fission —. — pr»mpt fissian *.*ttctar (Mokrotoi or glass) The principle of the recoil distance fission-in-flight method. N.B. The drawing is not to scale. Makrofol foils Experiment PS177: A Search for Heavy Hypernuclei at LEAR HYPERNUCLEI PS 177 Beam LEAR Approved ll/DEC/1980 Status Data—Taking A Search for Heavy Hypemuclei at LEAR Amsterdam N1KHEF, CERN, Darmstadt GSI, Grenoble, CJEJV., Orsay C.SJVSJM., Saclay CEN DPhN, Uppsala Univ., Warsaw Univ. Amsterdam NIKHEF Konijn J. Darmstadt GSI Polilcanov S.M. Grenoble, C.E.N. Bocquet J.P. M am el M. Moaiand E. Nifenecker H. Perrin P. Ristori C. Orsay C.S.N.S.M. Rey - Campagnolle/Epherre Saclay CEN DPhN Julien J. Mougey J. Uppsala Univ. Eriksson G. Johansson T. Tibell G. Warsaw Univ. Krogulski T. Spokesman: Polikanov, S.M. Contactman: Rey—Campagnolle/Epherre The aim of our experiment is to produce heavy hypemuclei by pN annihilations and to measure their lifetimes. Kaons emitted in this decay process of antiprotonic atoms could possibly interact with the residual nucleus and undergo a strangeness exchange reaction: K + N - A + m The A - hyperon will then be attached to the nucleus with a certain probability, forming a hypernucleus. Estimates give a probability of about 10"4 per antiprotonic atom. The lifetime for a heavy hypernucleus is expected to be of the order of 10"10 s. A signature of its decay would be delayed fission. For the detection of delayed fission, the 'recoil — distance method* is to be used. This method is suitable for lifetimes in the expected region. The fission fragments will be detected by position- sensitive counters in combination with track detectors. Stopping low momentum p from LEAR in a thin target will give the possibility to search for these events. Références PSCC/80-74/PSCC.,?15. PSCC/81-54/M 91. PSCC/82-76/M135, PSCC/84-14/M184. PSCC/84-61/M205, PSCC/85-58/M233, PSCC/85-44/M230 161 n-counter anticounfér bending magnet target 100 cm pbeam Experiment PS178: Study of Antineutron Production at LEAR LEAR/ANTINEUTRON PS 178 Beam LEAR Approved ll/DEC/1980 Status Data—Taking Study of Antineutron Production at LEAR Cagliari Univ., Padova Univ., Torino Univ. Cagliarl Univ. Macciotta M.P. Marcello S. Masoni A. Puddu G. Serci S. Padova Univ. Morandin M. Ricci R.A. Voci C. Torino Univ. Bressani T. Chiavassa E. Costa S. Dellacasa G. Gallic- M. lazzi F. Minetti B. Musse- A. Spokesman: Bressani, T. Contactman: Voci, C. The aim of this experiment is the study of antineutron (n) production at LEAR as a first step for the investigation of n — p n — n physics. A good method of producing high — quality n beams is that of using the charge — exchange (CEX) reaction pp -* nn on an external LH2 target. The production of n at 0° (see figure) may be most useful for some experiments, the production at different angles with the simultaneous detection of the associated neutron (tagged beam) most powerful for other measurements. The n calorimeter consists of ten equal modules: each one is made of an iron slab, a scintillator wall and a plane of x —y streamer tubes, with a detecting area of = 1 m2. The n calorimeter allows the determination of the time and the location of n annihilations. References PSCC/80-91/PSCC/P23, PSCC/80- 13S/PSCC/P 2:i/Add.l, PSCC/82-41/M112, PSCC/82-92/M146, PSCC/84-7/M178. PSCC/84-36/M198. PSCC/8S-68/M243, PSCC/8!i - S3/P23/Add. 2 163 - J EM - electromagnet SC - streamer chamber (70x90x18 cm ) HVPG - high voltage pulse generator TP - travelling platform ES -. electrostatic screening WC - wire chambers "- scintillation counters - thin walls (10f20 pm mylar, PVC) lateral counters (12% of total s.a.) '2,4 Experiment PS179: Study of the Interaction of Low-Energy p with H2, He3,He4, Ne-Nuclei Using a Streamer Chamber in Magnetic Field LEAR/STREAMER PS 179 Beam LEAR Approved 1 I/DEC/1980 Status Data-Taking Study of the Interaction of Low-energy Antiprotons with H2, He3, He4, Ne - Nuclei Using a Streamer Chamber in Magnetic Field Bergen Univ., Brescia Univ., Dubna JJJVJl., Frascati NatXab. (INFN), Oslo Univ., Padova Univ., Pavia Univ., Torino Univ. Bergen Univ. Haatuft A. Halsteinslid A. Myklebost K. Olsen J.M. Brescia Univ. Lodi Rizzini E. Dubna J.l.N.R. Batusov Y.A. Bunyatov S.A. Falomkin I.V. Pontecorvo G.B. Sapozhnikov M.G. Frascati Nat.Lab. (IffFN) Guaraldo C. Maggiora A. Oslo Univ. Breivik F.O. Jacobsen T. Sorensen S.O. Padova Univ. Peruzzo L. Sartori G. Vascon M. Pavia Univ. Bendiscioli G. Fumagalli G. Marciano C. Rotondi A. Zenoni A. Torino Univ. Balestra F. Bossolasco S. Bussa M.P. Busso L. Ferrero L. Garfagnini R. Grasso A. Panzieri D. Piragino G. Tosello F. Spokesman: Piragino G. Contactman: Piragino, G. The aim of this experiment is the systematic study of the interaction between low—energy antiprotons and the H2, He3, He4, Ne-nuclei using a self shunted streamer chamber in a magnetic field exposed to the antiproton beam of the LEAR facility. The properties of the self shunted streamer chamber, which allows the use of the filling gas (hydrogen, helium, neon at a pressure of 1 atm) as a target, permit to carry out experiments also in the very low—energy region. The experimental apparatus is suitable for a large programme of measurements. We plan to measure the pH2 cross section and the spectator momentum distributions at p momenta lower than 250 MeV/c, where data are lacking. It is interesting to study for the first time the pHe3 and pHe4 interactions measuring the cross sections and the emitted particle distributions. Among other things the knowledge of the branching ratio of the pHe4 annihilation channels clarifies some open cosmological questions. The study of the process of nuclear absorption of the antiprotons allows to obtain informations on different annihilation mechanisms. It will be possible to study the interactions produced in the deep annihilations inside the nuclear matter involving more than one nucléon. References PSCC/80-78/PSCC/PÎ7, PSCC/80-123/PSCC/P 17/Add.l, 80- 139/PSCC/P 17/Add.2, PSCC/82-48/M116, PSCC/82-S3/M120. PSCC/82-74/M133, PSCC/83-24/M1S8, PSCC/83-34/M164, PSCC/83 -35/Pl7/Add.3, PSCC/83 - 36/P17/Add.4. PSCC/85 - 6S/M240 165 BEBC/NEUTRINO PS180 Approved 19/MAR/1981 Status Completed 09/AUG/1984 Search for Neutrino Oscillations at CERN PS Using BEBC Athens Univ., Padova Univ., Pisa Untv./INFN, Wisconsin Univ. Athens Univ. Apostclakis A. loannou P. Kostarakis P. Kourkoumelis C. Pramatiotis P. Resvanis L. Padova Univ. Baldo - Ceolin M. Bobisut F. Calimani E. Ciampolillc S. Huzita H. Loreti M. Miari G. Puglierin G. SconzaA. Pisa Univ./INFN Angelini C. Baldini A. Bertanza L. Bigi A. Fantechi R. Flaminio E. Pazzi R. Pétri C. Saitta B. Wisconsin Univ. Camerini U. Fry W. Loveless R. March R. Procario M. Reeder D.D. CERN Katsanevas S. Spokesman: Baldo - Ceolin, M. Contactman: Bobisut, F. This experiment searches for neutrino oscillations detecting in BEBC neutrinos of different flavours originated by an initial v beam. A low energy proton beam extracted from the PS is used to provide a v beam focused towards BEBC. With such a beam two requirements for an experiment of high sensitivity are met: a) the ratio of the distance travelled by neutrinos over their energy is large; b) the beam is initially a high purity v beam, the background of v 's being a few in a thousand. fi e v, -«• V oscillations would manifest themselves giving v induced events in BEBC. The chamber filled with a heavy Ne — H2 mixture is an ideal instrument to detect and measure electrons with momenta from few tens of MeV/c to several GeV/c, as well as the CC v events for normalization. v •*• vT oscillation can be searched for by comparing the measured ratio NC/CC with that expected without oscillations. References PSCC/80 - 130/PSCC/P 33, PSCC/80 - 132/P 33/Add. 1 167 CLOSE DETECTOR y///////A -MUON CATCHER V777/////. FAR DETECTOR 3 Modules //////////s////////////s 7 Iron M Marble Experiment PS181: Contribution of the CHARM Collaboration to the CERN Neutrino Oscillation Program PS18i Approved 19/MAR/1981 Status Completed MAR/1983 Contribution of the CHARM Collaboration to the CERN Neutrino Oscillation Program CERN, Hamburg Univ., Amsterdam NIKHEF, Rome Umv.fUVFN, Moscow l.T£J*. CERN Allaby J.V. Amaldi U. Bergsma F. Capone A. Flegel W. Lanceri L. Metcalf M. Panman J. Santoni C. Winter K. Hamburg Univ. Abt I. Aspiazu G. Busser F.W. Daumann H. Call P.D. Niebergall F. Schutt P. Stahelin P. Amsterdam NIKHEF Dorenbosch J.P. Nieuwenhuis C. Rome, INFN Barbiellini G. Baroncelli A. Barone L. Borgia B. Bosio C. De Nouristefani F. Diemoz M. Dore V. Ferroni F. Longo B. Luminari L. Monacelli P. Tortora L. Valente V. Moscow I.T.E.P. Grigoriev E.A. Kaftanov V.S. Khovansky V.D. Rosanov A. Spokesman: Winter, K. Contactman: Winter, K. The experiment consists of two fine —grained calorimeters placed at different distances from the decay tunnel of the PS neutrino beam. The close detector, placed at about 150 m from the target, consists of three modules of the CHARM calorimeter and a muon catcher, to measure the energy of muons of charged current neutrino events up to about 2 GeV. The far detector is formed by ten modules of the CHARM type. A module consists of six 3 m x 3 m target plates made of 8 cm thick marble with 12 cm gaps for insertion of a) 20 scintillator counters of 15 cm width and 3 cm thickness b) 128 proportional counters of 3 x 3 cm2 cross — section and 4 m length and c) 256 streamer counters of 1 x 1 cm2 cross — section and 2.85 m long. The disappearance of v 's can be studied by comparing the charged current neutrino events in the close and far detectors. With a run of 2 x 1019 protons on the neutrino target one could put a limit of =* 0.3 eV2 on the mass difference Am2 = m2(r — m2(r ) for maximum mixing between v and v . References PSCC/81-8/PSCC/P37. SPSC/81 -99/M308, SPSC/81 -99/M308/Corr.. SPSC/83-26/M3S2, SPSC/83-33/M3 55, SPSC/83 - 39/M356 169 28 cm Experiment PS182: Investigations on Baryonium and Other Rare pp Annihilation modes Using High-Resolution ir Spectrometers LEAR/GAMMA PS 182 Beam LEAR Approved 21/MAY/1981 Status Data-Taking Investigations on Baryonium and Other Rare pp Annihilation Modes Using High - resolution w° Spectrometers Basel Univ., Stockholm Univ., Thessaloniki Univ. Basel Univ. Backenstoss G. Findeisen C. Kuzminski I. Mall U. Meyer H.O. Rickenbach R. Schopper A. Tauscher L. Stockholm Univ. Bergstrom I. Carius S. Kerek A. Stockholm Res. Inst. Adiels L. Thessaloniki Univ. Charalambous S. Hadjifotiadou D. Papastefanou K. Zioutas K. CERN Pavlopoulos P. Troester D. Spokesman: Tauscher, L. Contactman: Tauscher, L. The inclusive spectra of tr°'s and 7j's associated with pp annihilation at rest are measured. Peaks in these spectra can be identified either with so far not explicitly observed two mesonic final states such as i7°o), i7°T), T)TJ or ir°y, or with production of exotic mesonlike states such as baryonium. The apparatus is also suitable for searching for baryonium through some of its particular decay channels. As a by—product we expect information on direct y production in pp annihilations at rest. The apparatus consists of two modular BGO spectrometers and one array of leadglas detectors. The BGO spectrometers are adjustable in angle relative to each other and to the leadglas matrix, thus allowing to cover an angular range from 9° to 180°, corresponding to momenta of zero to more than 1 GeV/c. The apparatus is designed such as to utilize the full potential of LEAR. References PSCC/80-142/PSCC/P 36, PSCC/81-31/P 36/Add. 1, PSCC/82-79/M138, PSCC/85 - 64/M239 171 X(cm) i i i i r I i i i i -240 -160 •80 0 80 160 240 - 200 i i l i i PH - 120 PDC J V Pi Ei \ -40 \ E MEP-21-2 a \ \ N —40 \ Q \ S B V\ \ \ \ \\\ i i i i AH 120 RDC Beam^ I n r^ ,_,G _rr M Beam "M —200 NDC S1 AREA Ref : Project Lear Areas Layout II Shield Wai I—^ January I982 Experiment PS183: Search for Bound NN States Using a Precision Ganma and Charged Pion Spectrometer at LEAR LEAR/GAMMA PS183 Beam LEAR Approved 21/MAY/1981 Status Data-Taking Search for Bound NN States Using a Precision Gamma and Charged Pion Spectrometer at LEAR Athens Univ., U.C. Irvine, Karlsruhe KJK j Univ., New Mexico Univ., Albuquerque, Pennsylvania State Univ., Strasbourg! CJUV. Athens Univ. Angelopoulos A. Apostolakis A. Papaelias P. Rozaki H. Sakelliou L. Spyropoulou-Stassinaki M U.C. Irsine Fero M. Gee M.Y. Mandelkern M.A. Ray R. Schultz D. Schultz J. Usher T. Karlsruhe KfK / Univ. Bueche G. Koch H. Rohrbach W. Walther D. New Mexico Univ., Albuquerque Bassalleck B. Denes P. Graf N. Komninos N. Wolfe D.M. Pennsylvania Stale Univ. Armstrong T.A. Biard J. Lewis R.A. Oh B.Y. Playfer S.M. Smith G.A. Soulliere M. Whitmore J. StrasbourgjCR. N. Suffert M. Spokesman: Smith, G.A. Contactman: Armstrong, T. This experiment uses a magnetic spectrometer to search for monoenergetic y and w+ transitions between bound NN states. The spectrometer is instrumented with drift chambers (NDC, RDC and PDC), proportional wire chambers (A —E), and various thin scintillation counters (S,M,G,AH,V,Q,D,E and PH) for trigger purposes, as shown in the accompanying drawing. Gamma—rays produced in the LH2 target are materialized by a 5% converter located in the B chamber with an acceptance (A8/4w) of *2-6x10"3 (100-400 MeV) and 6xiO~3 (>400 MeV). Trajectories of bent electron — positron pairs and ir± are measured in the A —E chambers. Trajectories of less frequent high energy penetrating tracks, as well as the remaining associated charged annihilation products exiting the target, are measured in the drift chamber system. The resultant energy resolution (AE/E) is expected to be better than 1,5% R.M.S. over the full range of energies studied. To illustrate the sensitivity of this experiment, a y line at 300 MeV produced at the level R = r /r » = 10~4 will appear as a six standard deviation effect after an exposure of 5 x 1011 p's. References PSCC/80-93/PSCC/P24, PSCC/80- 136/P 24/Add. 1, PSCC/81 -7/P 24/Add. 2. PSCC/82-78/M137, PSCC/84-4S/M202. PSCC/85 - 13/M216, PSCC/85 - 60/M235 173 Genera] lay-out of the experimental set up. 1. In beam monitor and TOF start thin scinti1lator. 2. Target 3. Target vacuum chamber 4. Coincidence counter 5. SPES II Spectrometer 6. Multiwire chambers 7. Scintillator hodoscope 8. Horizontal focal surface Experiment PS134: Study of p-nucleus Interaction with a High Resolution Magnetic Spectrometer LEAR/SPES II PS184 Beam LEAR Approved 21/MAY/1981 Status Data-Taking Study of p-nucleus Interaction with a High Resolution Magnetic Spectrometer Grenoble, CJEJV., Saclay CEN DPhN, Strasbourg/CJUV., Tel-Aviv Univ. Grenoble, C.E.N. Berrada M. Bocquet J.P. Monnand E. Mougey J. Perrin P. Saclay CEN DPhN BirienP. Bruge G. Catz H. Chaumeaux A. Drake D. Garreta D. Janouin S. Legrand D. Mallet-Lemaire M.C. Mayer B. Pain J. Peng J.C. Perrot F. Strasbourg/CR.N. Aslanides E. Bing O. Tel-Aviv Univ. Lichtenstadt Y. Yavin A.I. Spokesman: Garreta, D. Contactman: Garreta, D. This experiment uses the high resolution, large solid angle and large momentum acceptance magnetic spectrometer SPES II to study the interaction between p and complex nuclei in the following experiments: 1) A(p, p)A. Angular distribution of p elastically scattered from 12C, 40Ca and z08Pb. 2) A(p, p')A*. Excitation energy spectra and some angular distributions of p inelastically scattered from 12C, 40Ca and 208Pb up to an excitation energy of =* 100 MeV. 3) A(p, piA^.j (p). Excitation energy spectra for knock out reaction on 6Ii, 12C, 63Cu and 209Bi at several angles. Any beam momentum between 300 MeV/c and 800 MeV/c will be suitable for this experiment. In order to vary the effect of strong absorption of p by nuclei, elastic and inelastic scattering will be performed at two or three different p momenta (depending on the way LEAR will be operated) down to 300 MeV/c. References PSCC/80-140/PSCC/P3S, PSCC/S1 -36/P 35/Add. 1, PSCC/81 -59/P35/Add.2, PSCC/82-72/.M131, PSCC/82-83/M142, PSCC/82-97/M148, PSCC/84 -45/M202. PSCC/84 -62/M207, PSCC/84-6S/M209 175 SI S2, S2s p beam T, T, •* — ___ S3, S3* l 1cm— Target Region 0 10 50 cm Experimental set-up with: 1^: target, 2_: proportional wire chambers, 3j drift chambers, 4^ hodoscope, 5h baryon number identifier. An example of a "perfect track event" is indicated. The sandwich target is given in a magnified view with J_= target, Sl-3: scintillation counters. Experiment PS185: Study of Threshold Production of pp -»- YY at LEAR LEAR/HYPERONS PS 185 Beam LEAR Approved 22/OCT/1981 Status Data-Taking Study of Threshold Production of pp - YY at LEAR Carnegie —Mellon Univ., Erlangen—Nuernberg Univ., Freiburg Univ., Illinois Univ. Champaign, Julich KFA, Rice Univ. Houston, Saclay CEN DPkN, Uppsala Univ., Vienna Akad. Wissensch. Carnegie - Mellon Univ. Barnes P.D. Diebold G. Franklin G. Hertzog D. Maher C. Quinn B. Seydoux J. Szymanski J. Erlangen - Nuernberg Univ. Besold R. Eyrich W. Frankenberg R. Hoftnann A. Mueller R. Ortner H. Woldt P. Freiburg Univ. Dutty W. Franz J. Hamann N. Roessle E. Schledermann H. Schmitt H. Illinois Univ. Champaign Eisenstein R.A. Julich KFA Kilian K. Rice Univ. Houston Bonner B. Saclay CEN DPhN Birien P. Uppsala Univ. Ericsson G. Johansson T. Ohlsson S. Vienna Akad. Wissensch. Breunlich W.H. Pawlek P. Spokesman: Kilian, K. Contactman: Johansson, T. We measure total and differential cross — sections, as well as hyperon — antihyperon polarizations and spin correlations in the two —body reactions pp •• YY. The channels AA, A2° + c.c. and 22 will be studied. Our aim is to determine quantum numbers of the strange — antistrange quark pair creatiou which is embedded in these different YY channels. We want to study also aspects of low energy YY final state interactions. A valuable byproduct will be information on hyperon and antihyperon scattering on protons and carbon including the spin dependence of the cross section. A comparison of the partial decay branching ratios, the decay — asymmetries, and the lifetimes of hyperons and antihyperons will be possible. Information about the reaction pp -• K.K will also be collected. 5 S The signature of delayed hyperon decays Y -»• pw permits a clean on-line trigger. The full YY kinematics is reconstructed from tracks in a 30 cm long stack of MWPC's and drift chambers. Hyperon and antihyperon can be distinguished by the charge determination of the decay particles. For this purpose we use a solenoid detector with 3 drift chambers inside, providing high efficiency and low annihilation background. The pp beam cross section of < 1 mm2 and a sandwich target arrangement with (at present 5) CH2 target slabs of 2.5 mm thickness allows to define the YY production vertex within < 2 mm3. With 10* p per second one gets for each target cell a sensitivity of > 200 perfectly reconstructable events per day and pbam. References PSCC/81-29/1 59, PSCC/81 - 69/P 49, FSCC/82-57/M122, PSCC/82-84/M143, PSCC/83-6/M1S2, PSCC/84-I5/M185. PSCC/84-26/M192, PSCC/85-9/M2U, PSCC/8S-27/M22S, PSCC/85 - 34/M228, PSCC/85-66/M241 177 Schematic experimental set-up, top view Ge, Si(Li): X-ray detectors S : Scintillation counters M : Coarse moderator SM : Scintillator/fine moderator TH : Target holder T : Target Experime t PS186: Nuclear Excitations by Antiprotons and Antiprotonic Atoms LEAR/XRAYS PS 186 Beam LEAR Approved 22/OCT/1981 Status Data - Taking Nuclear Excitations by Antiprotons and Antiprotonic Atoms Munich TU Munich TU Daniel H. vonEgidyT. Hagn H. Hartmann F.J. Kanert W. Moser E. Plendl H. Schmidt G. Mississipi Univ. University Reidy J.J. Spokesman: von Egidy, T. Contactman: von Egidy, T. The proposal aims at the investigation of nuclear excitations following the absorption and annihilation of stopped antiprotons in heavier nuclei and at the same time at the study of the properties of antiprotonic atoms. The experimental arrangement will consist of a scintillation counter telescope for the low momentum antiproton beam from LEAR, a beam dégrader, a pion multiplicity counter, a monoisotopic target and Ge detectors for radiation and charged particles. The data are stored by an on - line computer. The Ge detectors register antiprotonic x-rays and nuclear y — rays which are used to identify the residual nucleus and its excitation and spin state. Coincidences between the two detectors will indicate from which quantum state the antiprotons are absorbed and to which nuclear states the various reactions are leading. The measured pion multiplicity characterizes the annihilation process. A Ge —telescope identifies charged particles and determines their energies. The experiment will give information on : - quadrupole effects between antiprotonic and nuclear states - strong interaction level widths and shifts - the annihilation process - nuclear excitations by stopped antiproton absorption and isotopic distribution of residual nuclei. - the formation of antiprotonic atoms (including chemical effects) The experiment will be performed with several isotopes, in order to look for E2 nuclear resonance effects and for the influence of the nuclear structure on the annihilation process. References PSCC80-83/P 19, PSCC/82-70/M129, PSCC/84 -8/M179 179 175 MeV p B) A) A) THE REACTION p + A - p + A* . B) PION PRODUCTION AND CORRELATIONS IN 175 MeV ANTIPROTON-NUCLEUS INTERACTIONS. Experiment PS187: A Good Statistics Study of p Interactions with Nuclei PS187 Beam LEAR Approved 22/OCT/1981 Status Completed 17/JUN/1984 A Good Statistics Study of Antiproton Interactions with Nuclei Los Alamos NatJLab., Grenoble, ISJV. Los Alamos Nat.Lab. Clover M. DeVries R. DiGiacomo N. Kapustipiky J. McGaughey P. Sondheim W. Sunier J. Grenoble. I.S.N. Buenerd M. Chauvin 1. De SJntignon P. Lebrun O. Martin P. Spokesman: DiGiacomo, N J. Contactman: DiGiacomo, N J. This experiment extends the study of inclusive pion production and the correlation between pions which result from hadron- nucleus collisions at intermediate and high energies to the antiproton—nucleus system. It is part of a long term systematic search for exotic nuclear phenomena. The correlation data will be used to extract, via pion interferometry, the size and coherence of the annihilation source in nuclei. In addition, the reaction p + A •• p + A* will be studied to look for structure in the proton spectra which might reflect possible antiproton - nucleus bound states. ITie experimental system is based on a flexible, broad range, large acceptance (1 steradian) spectrometer which consists of an 80 cm diameter dipole magnet surrounded with detector arrays. These detectors provide momentum, energy loss, Cercnkov and time of flight information for up to ten ejectiles per event. Momentum resolution varies from 1% to 3%, depending on energy. Référença PSCC/81-ÎI/P47. PSCC/81-75/P47/Add. 1, PSCC/82-71/M130 181 DC-3 DC-1 B-2 Nal SC BEAM DUMP lOm Im 3m 5m APPROXIMATE DISTANCES Experiment PS188; Measurements of Channelling Radiation and its Polarization, X-ray Excitation, together with Deviations from Landau Distributions CHANNELLING PS 188 Beam T7 Approved 09/DEC/1981 Status Data-Taking Measurements of Channelling Radiation and its Polarization, X - Ray Excitation, together with Deviations from Landau Distributions Aarhus Univ., CERN, Strasbourg Univ. Aarhus Univ. Bak i. Ellison J.A. Meyer F. M oiler S.P. Ostergaard K. Pedersen J. Stensgaard R. Uggerhoj E. CERN Sorensen A. Strasbourg Univ. Regall R. Sifiert P. Suflert M. Spokesman: Uggerhoj, E. Contartman: Sorensen, A. This experiment is a continuation of the channelling experiments PS 164 and WA64. The following points are investigated : a) Radiation from channelled 1 to 10 GeV/c positrons and electrons. The results clearly show that the region of 1 — 10 GeV/c is a very important and interesting momentum range where the onset of relativistic effects in connection with the unharmonicity of the channelling potential can give rise to very sharp peaks in photon spectra which could be used as a radiation source. With a detector opening angle which is large compared to 1/y, these peaks appear sharp only on the high energy side. If, on the other hand, only forward emitted channelling radiation is detected, nearly symmetric peaks are expected to emerge. This is measured by means of a position sentitive y — detector, consisting of an CdTe — array. Here each detector is 0.8 x 0.8 x 3 mm3 and act as an active converter with the final shower absorbed in a large scintillator. Hereby an angular resolution of 1/3 y around 40 prad is obtained which should result in only 10% energy spread. b) Pair production effects under channelling conditions are considered. c) Straggling for thin solid target. Due to the breakdrown of the free — electron approximation, the energy—loss distribution for thin targets gets broader than the Landau result. A systematic investigation of this effect will be done for very thin detectors of Si and Ge. The experiment will use a secondary charged beam containing protons, pions, electrons, and positrons in the momentum range of 1 —10 GeV/c and equipped with a particle identification system. The detectors consist of a set of small — size high — accuracy drift chambers, live targets, X — ray detectors and a Nal photon detector. The collimation of the channelling radiation is done with a position sensitive converter in front of the Nal detector. References PSCC/81-79/P51 Reviled, PSOC/82-93/PSl/Add.l Rev., PSCC/82-94/M147, PSCC/83-54/M173, PSCC/84-4/M177, PSCC/8S-4/M2I0, PSCC/85-12/M215 183 RF MODULATOR POLES «^MAGNET CROSSED FIELDS SECTORS i CYLINDRICAL SECTORS — •'- :SPHERICAL SECTORS-»-.- 1m DETECTOR SLIT SOURCE SLIT _^. POLE * *.".TrJ.V."."-"".V.-.-.VJ™.V.V.V.-.VM*Mttnttt** \ S LI TS 1 :::::::::::::::::::::::"::::::"r.;":::""":""";;;!!!! R.F. MOD. ::::::—•::::::::::::::::m > Experiment PS189: High Precision Mass Measurements with a Radiofrequency Mass Spectrometer - Application to the Measurement of the pp Mass Difference LEAR/PBARMASS PS 189 Beam LEAR Approved 03/FEB/1983 Status Preparation High Precision Mass Measurements with a Radiofrequency Mass Spectrometer - Application to the Measurement of the pp Mass Difference CERN, Orsay C.SJV.SM. CERN Haebel E. Herr H. Klapisch R. Lebee G. Petrucci G. Stefanini G. Orsay CS.N.S.M. Audi G. CocA. Fergeau R. De Saint-Simon M. Thibault C. Toucharo F. Spokesman: Thibault, C. Contactman: Stefanini, G. CPT invariance demands that masses of particles and anti—particles should be equal. Even though it has been tested to a limit of 1014 from the K°i K° mass difference, it is not very satisfactory that the verification of such a fundamental principle should be checked on one system only. The purpose of this experiment is to make a qualitative increase in the precision of the proton—antiproton mass ratio : the present accuracy is 5.1U~S while we aim to determine it at some 10"9. The ratio of the masses of H~ and p will be directly determined using a mass spectrometric method. The mass spectrometer which is under construction consists of a very homogeneous and constant magnetic field in which the ions of interest turn twice. The rotation frequency is the cyclotron frequency f0 which is inversely proportional to their mass. During this rotation, the ions pass twice through a modulator where their energy E is modulated as a function of time with a frequency f> >f0. The only ions to be extracted are these for which the sum of the two modulations is zero : it is the case for all ions if: f = (n+ 1/2) f0 where n is integer. The ratio of the masses is thus equal to the inverse ratio of the cyclotron frequencies. The apparatus could accept p whose energy is between 150 and 300 keV — 20MeV/c - so that an intermediate decelerating stage is needed between LEAR and the RF spectrometer : the ELENA project or a RFQ are presently studied. A resolving power of =* 106 could then be obtained with a 10 "4 transmission, so that it would lead to an accuracy of =* 10"9 for the mass ratio of p and H~. References PSCC/81 - 84/P52, PSCC/83 - 7/M1 S3 185 Top view \/ End calorimeter Anti plane flash-tube planes helium-bags Side view Experiment PS191: Search for Decays of Heavy Neutrinos with the PS Beam NEUTRINO DECAY PS191 Approved 25/APR/1983 Status Completed 09/AUG/1984 Search for Decays of Heavy Neutrinos with the PS Beam Athens Demokritos, CERN, Paris, LPNHE, P.et M.Curie Univ. Athens Demokritos Dris M. Simopoulou E. Vayaki A. CERN Ferro - Luzzi M. Perreau J.M. Peyrou C. Paris. LPNHE. P.et M.Curie Univ. Bernardi G. Levy J.M. Pons Y. Rivoal M. Vannucci F. Rome Univ. Carugno G. Di Carlo F. Paris College de France Chauveau J. Spokesman: Vannucci, F. The experiment searches for neutrino decay, primarily into the e+e>_ and yyv modes. Neutrino masses in the region between 1 and 400 MeV will be explored. The beam used is the neutrino PS beam used for the oscillation experiments. The apparatus consists of a decay volume =*30m long and a calorimeter =*8 radiation lengths thick and =*20 mz in surface. The detectors are flash—tube modules of the type developed at Saclay for the proton — stability experiment. Scintillator hodoscopes give the timing information necessary for the trigger logic and background rejection. Rtferêncts PSCCÏ3-12/P67 187 CHANNELTRON ACCELLERATION TUBE PMT PMT LIGHT GUIDE LIGHT GUIDE SCINTILLATOR SCINTILLATOR GOLD COATING*0.8kV GOLD COATING *0.8 kV 100 mm T777/A ALUMINIUM '~ PLASTIC Experimental apparatus. Experiment PS194: Measurements of the Ratio Between Double and Single Ionisation of Helium for Antiprotons LEAR/IONIZATION PS 194 Approved 15/NOV/1984 Status Preparation Measurements of the Ratio Between Double and Single IonizatioE of Helium for Antiprotons Aarhus Univ., CERN, Stockholm Res. Inst. Aarhus Univ. Bak J. Hvelplund P. Knudsen H. Uggerhoj B. CERN Moller S.P. Sorensen A.H. Stockholm Res. Inst. Astner G. Bergstrom I. Liljeby L. Spokesman: Uggerhoj, E. Contactman: Moller, S.P. The aim of this experiment is to measure the ratio between double and single ionization of helium by antiprotons in the energy range > 3 MeV. Comparison with already existing proton data will yield information on the mechanisms for double ionization, which could not be extracted from previous comparisons between ratios measured for equivelocity electrons and protons. The most basic information to be obtained from an antiproton experiment will be the amount of correlation existing between the two electrons in the ground — state helium atom. The equipment consists of a gas cell, which employs slow —ion collection via the so —called condenser-plate method for the absolute sum of partial — ionization cross sections and determination of the relative contribution of multiple charged ions by TOF. The gas cell has movable entrance and exit slits and a grid system to account for secondary emission from the collection of slow ions. Together with a field of 800 V/cm in the collision region, the potentials of the TOF spectrometer yield results insensitive to moderate variations in the potentials. PSCCj»2-SS#P64, PSCQM-18/PMfAdd.i. PSCC/M-4«/P64/Add.2, PSCC/8S-63/M238 189 STREAMER TUBES CERENKOV cm SCINTILLATORS Experiment PS195: Tests of CP Violation with K° and K° at LEAR LEAR/CPVIOLATION PS 195 Approved 12/SEP/1985 Status Preparation Tests of CP Violation with K° and K° at LEAR Athens Demokritos, Basel Univ., CERN, Fribourg Univ., Liverpool Univ., Saclay CEN DPhPE, SJJV., Stockholm Res.Inst., Thessaloniki Univ., Zurich E.TH. Athens Demokritos Dris M. Kokkinias P. Kostarakis P. Papadolpoulos L. Zevgolatakos S. Athens Univ. Filokyprou G. Basel Univ. Backenstoss G. Hugi M. Kuzminski J. Mall U. Rickenbach R. Schopper A. Tauscher L. CERN Bloch P. Fidecaro M. Garreta D. Kesseler G. Pavlopoulos P. Troester D.A. Watson E. Fribourg Univ. Dousse J.C. Kern J. Schaller L. Liverpool Univ. Bee C. Fry J.R. Gabaihuler E. Harrison P. Hayes W.G. Hayman P. Mason P. Saclay CEN DPhPE Burgun G. Derre J. Faure J.L. Guyot C. Kochowski C. Marel G. Milstajn A. Pauli E. S.I.N. Nakada T. Stockholm Res. Inst. Adiels L. Bergstrom I. Carius S. Kerek A. Lindblad T. Nilsson A. Thessaloniki Univ. Chaldaras M. Charalambous S. Dedousis S. Hatzifotiadou D. Zurich E.T.H. Antonelli A. Beltrami 1. Fetscher W. Gerber H.J. Ungricht E. Spokesman: Pavlopoulos, P. Contactman: Pavlopoulos, P. The intense and clean beams of antiprotons that will be available after ACOL is in operation will open up the possibility of producing a large flux of tagged K° and K° mesons. In this experiment we study with high precision the CP —violating phenomena in the neutral kaon system, by measuring the interference effects and the asymmetries of the three chief decay amplitudes, i.e. the two—pion, the three—pion, and the semi—leptonic modes. This method of symmetrical production of particles and antiparticles in proton—antiproton annihilation at rest, and the identical detection of their decay products, has the advantage of minimizing the systematic errors and of allowing the detection of CP breakdown also in channels other than the two —pion one. Rtftrtnea PSCCjaS-6!P82, PSCC|*S-30/P*2|fA STATUS OF 1985 Î93 Ht LM HO l_T2i Coil, »•••••.•••••••,•—.-.•••••-i I; : •. •• -. .-7 : -x. - ..I FOR1VAP.D £- 1.- .-•• •••... -..•.-. •.. rrn TELESCOPE " f if -. •.••,•••,•.-•••,•••• % •'•! I.-. •• •.:•. :••••• .^ I.-. . - .•.I Experiment SC65: Local Magnetic Fields in Ferromagnetics Studied by Positive Muon Precession MUSR SC65 Beam LJ1 Approved 09/APR/1975 18/OCT/1978 17/JUN/1982 Status Data — Taking Local Magnetic Fields in Ferromagnetics Studied by Positive Muon Precession CERN, Grenoble, I.SJV., Uppsala Univ. CERH Niin>oski T.O. Grenoble, l.S.t;. Chappert J. Yaouanc A. Uppsala Univ. Harimann O. Karlsson E. Lindgren B. Wappling R. Spokesman: Karlsson, E. Contactman: Hartmann, O. Positive muons are used to study local magnetic fields in different materials. A polarized muon beam is employed with energies of 30 — 50 MeV, and the muons are stopped in the target being studied. During its lifetime the muon will precess in the magnetic fields present, and after the decay of the muon the emitted positron is detected in plastic scintillators. The time and angle of the detected positron is used to calculate the magnetic field at the position of the muon in the sample. The detector system consists of plastic scintillators and Cerenkov counters. Most of the measurements are made in the zero external field. A dilution cryostat is used to produce temperatures down to well below 1°K. Experiments were first performed in some simple ferromagnetic metals (Ni, Fe) and some alloys. I^ater on, a semi —metal system, Sb —metal, showing strong local spin polarization, was investigated. The present investigations include: a) the effects of impurities on the signal in Fe — metal; b) the local magnetization near the Curie temperature in compounds of the Laves phase type (RE)A12 where RE is a rare earth ion. The spin relaxation of the muons are studied in the paramagnetic region. c) studies of muon spin relaxation in some amorphous magnets. References PH 111-74/59, 75/7. SCC/76-3. 77/10. PSCC/78-4/M 3. 79-47/M36. 79-S2/M40, PSCC/B1 -5/M 76. PSCQSJ - J6/M 78. PSCC/82-23/M10S, PSCC/83/48/M169. PSCQ43-50/M171 195 SEZ. AA Experiment SC68: Muonic Chemistry in Condensed Matter Beam CJ2 Approved 08/OCT/1975 18/OCT/1978 Status Data-Taking Muonic Chemistry in Condensed Matter Parma Univ. Parma Univ. Bucci C. De Renzi R. Crippa R. Guidi G. Podini P. Tedeschi R. Vecli A. Spokesman: Bucci, C. Contactman: Tedeschi, R. When polarized muons (n + ) stop in condensed matter, muonic atoms are formed in the final part of their range, and direct measurements of the /i+ — spin polarization are possible via the asymmetric decay into positrons. The hyperfine interaction determines the characteristic precession frequencies of the /i + spin in muonium, co(Mu). Such frequencies can be altered by the interactions of the muonium's electron spin with the surrounding medium. The measurement of w(Mu) in a condensed system is known often to provide unique information regarding the system. In particular, the use of muonium atoms as a light isotope of the simple reactive radical H° allows the investigation of fast reactions of radicals over a typical time scale 10 ~9 < t < 10 ~s sec, which is determined by the instrumental resolution at one end and by the n + lifetime at the other. In biological macromolecules transient radicals, such as the constituents of DNA itself, exist on a time scale of sub — microseconds, according to the results of the present experiment and to ESR data on the same materials in the solid state. The proposed experiments are intended to investigate such transient radicals in other substances of biological interest, where their detection is fundamental for the basic understanding of the changes occuring both naturally and as a consequence of damaging agents. The basic experimental equipment consists of a detection system with scintillation counter detectors placed before and after the sample, so arranged as to provide "clean* trigger signals both when a (i+ has stopped in the sample and when the positron of the decay has been emitted in a given direction. The time difference between the two n+ and e+ pulses is then measured and p+ —decay histograms constructed. The n* —spin precession, as determined by the hyperfine interaction with the electron spin in muonium as well as by the surrounding medium, is revealed as a time modulation of the decay histogram. Besides the conventional scintillator detector system, a wire —chamber spectrometer is now being used in these experiments. The precise determination of the position of the decay vertex in this apparatus allows almost background—free measurements to be performed. Références PH 111-75/12, SCC/76-3-,77-12. PSCC/78-21/M10; 7«-2S, 79-46/M3S; 79-S2/M40, PSCC/M-49/M170. PSCC13-S0/M17I 19? NEUTRON HALL JJSR Experiment SC76: Impurity Trapping of Positive Muons in Metals MUSR SC76 Beam CJ2 Approved 22/SEP/1977 18/OCT/1978 17/JUN/1982 Status Data—Taking Impurity Trapping of Positive Muons in Metals CERN, Geneva Univ., Julich KFA, Uppsala Univ. CERN Niinikoski T.O. Geneva Univ. Walker E. Julich KFA Hempelmann R. Kehr K.W. Richter D. Welter J.M. Uppsala Univ. Hartmann O. Karlsson B. Aachen TH Schultze K. Spokesman: Karlsson, E. Contactman: Karlsson, E. Polarized positive muons are implanted into metal samples. In an applied magnetic field the muon spin precession is studied. The line width in the precession frequency spectrum gives information about the static and dynamic properties of muons in a metal lattice. At temperatures where the muon is immobile within its lifetime the line width gives information about the site of location. At temperatures where the muon is mobile, the line width gives information on the diffusion process. It is known from experiments on quasi — elastic neutron scattering on hydrogen in niobium that interstitial impurities like nitrogen tend to act as traps for hydrogen. These trapping effects have now been studied systematically for muons in both f.c.c. metals (aluminium and copper) and b.c.c. metals (mainly niobium). Direct information on the trapping rates and the nature of the diffusion processes can be obtained since the muonic lifetime covers a time range where many of these processes occur. Mathematical models are set up for the trapping and release processes. These phenomena are studied in detail for certain selected impurity —host combinations. It has been found very important to have access to temperatures down to 0.03 K, for the study of the basic diffusion processes for muons. As an example of diffusion studies at higher temperatures, we can mention the case of concentrated hydrides like NbH(x) (x = 0.7 — 0.9) where the muons are playing the role of 'spectators* of the hydrogen diffusion. References SCC/77-20. PSCC/7B - 3/M 2, 79-47/M36; 79-S2/M40, PSCC/81 - S/M 76, PSCC/81 - 16/M 78, PSCC/82-23/M105, PSCCI83-47/M16B. PSCQ83- SO/MI71 199 S3 Helmotz Coil Cryostat Experiment SC81: Formation and Interaction of Muonium in Insulators and Semiconductors Beam CJ2 Approved 18/JAN/1979 17/JUN/1982 Status Data-Taking Formation and Interaction of Muonium in Insulators and Semiconductors Parma Univ., Rutherford Appleton Lab. Parma Univ. Bucci C. De Renzi R. Guidi G. Podini P. Tedeschi R. Rutherford Appleton Lab. Cox S.F.J. Scott C. Spokesman: Bucci, C. Contactman: Tedeschi, R. SEMI-CONDUCTORS Many muon spin rotation experiments have been performed on Si and Ge. Two types of muonium atoms have been detected at temperatures between LNT and 20°K: a) Deep-donor type with fully spheric symmetry. b) Shallow-donor type, where the electron shows a non—full hyperfine coupling with the neighbouring. This type of muonium has a cylindrical symmetry along the < 111 > direction in both Si and Ge. Measurements at very low temperature (60mK — 20K) have given important information on the dynamics of these two centres. Measurements will also be made on GaAs which is very similar to Si and Gs, both in lattice structure and in energy gap. However both elements in these compounds have strong nuclear magnetic moments that smear out the hyperfine transitions detected by jiSR in a transverse field. So the investigation on muonium formation in this material has to be made in longitudinal fields. Its dependence on doping will be studied on a large range of concentration, using samples grown at Parma University. INSULATORS Muonium is believed to be present in most insulators and its formation can be proven by longitudinal field 'quenching' experiments, as in the case of most semi—conductors. Furthermore muonium dynamics at different temperatures can be studied in transverse field experiments. In magnetic insulators, however, while the muonium precession is very often hidden by magnetic perturbations, very interesting information is yielded by the diamagnetic fraction of muons, processing at the Larmor frequency. Experiments on MnF2 single crystals, which constitute a very well known test case for antiferromagnetic insulators, have shown that the muon is sensitive to the critical behaviour of the electron spin fluctuations. The muon localization as well as the fluctuation component at K = Kr and the frequency shift have been deduced. The same technique will be applied to a vast category of magnetic materials of the family of the fluorides and oxides. EQUIPMENT For transversal field experiments the set —up in use by the SC65 will be used. For longitudinal measurements an alternative set—up will be used as shown. The wire chamber spectrometer has proven very useful in the experiments on antiferromagnetic insulators, where the discrimination between muons stopped in the sample and those stopped in the cryostat wall is very critical. References PSCC/7A-22/P4. 79-48/M37, 79-52/M40, 79-53/M41, 80-12S/PSCC/M 69, PSCC/81 - 16/M 78, PSCQÏ2-23/MI0S. PSCC/83-48/M169. PSCC/83-S0/M17I 201 J M c nom 1 1 HE DHES 1 / M Szctlon AA i SclntMaton. M C Coltbnoutofi Experiment SC82: ySR in Organic and Free Radical Chemistry SC82 Beam CJ2 Approved 18/JAN/1979 20/MAR/1980 17/JUN/1982 Status Completed MAR/1984 juSR in Organic and Free Radical Chemistry CERN, Parma Univ., Rutherford Appleton Lab. CERN Hill A. Parma Univ. Bucci C. Podini P. Tedeschi R. Vecli A. Rutherford Appleton Lab. Cox S.F.J. DeRenzi R. Stirling G. Spokesman: Stirling, G.C. Contactman: Tedeschi, R. Experiment SC82 was begun as a simple attempt to substitute positive muons into polymer molecules, and thereby to use the /*SR technique to study the mechanical relaxation of the different molecular groups. The experiment has since developed in several directions and has produced a wealth of information on the properties of muonic molecules, and adequately demonstrated the potential of (iSK as applied to molecular physics and chemistry. Physics aspects are now covered by a new experiment code SC95. The present experiment includes studies where the position occupied by the muon in the molecule (or crystal lattice) is readily established and the (iSR signal is exploited to reveal the intrinsic properties of the material. In this respect the /iSR techniques may be regarded simply as an experimental tool to probe the molecular behaviour of a chemical system. Two main classes of application include the measurement of isotope effects, where differences between muonic and corresponding photonic radicals are interpreted in terms of molecular conformation and dynamics, and muon labelling, which allows direct measurement of chemical reaction rates. References ?SCC/78-2S, 79-S2/M40;79-S3/M41, 80-24/MS4, PSCC/81 - 16/M 78. PSCC/82-23/M105, PSCC/83-49/MI70, PSCC/83-50/M171 203 M1-M5: Plastic Scintil- lator + Nal Tele- copes 1,0 : Plastic Range Telescopes PF : Plastic Scintillator Wall (24 telescopes) Experiment SC33: Study of Particle Production in 12C Induced Heavy Ion Reactions at 86 MeV/N M IN-PLANE OUT-OF-PLANE IONS SC83 Beam C Approved 18/JAN/1979 24/JAN/1980 02/JUL/1980 Status Data-Taking Study of the Particle Production in 12C Induced Heavy Ion Reactions at 86 MeV/N Bergen Univ., Copenhagen Niels Bohr last., Grenoble, C£JN., Grenoble, I.SJV., Lund Univ., Saclay CEN DPhN Bergen Univ. Lovhoiden G. Rodland T. Thorsteinsen T.F. Copenhagen Niels Bohr Inst. BondorfJ.P. Nielsen O.B. Grenoble, C.E.N. Guet C. Hewer D. Maurel M. Mougey J. Nifenecker H. Perrin P. Pinston J. Ristori C. Schussler F. Grenoble. I.S.N. Buenerd M. Lebrun D. Loiseaux J.M. Martin P. Lund Univ. Carlen L. Jakobsson B. Gustafsson H.A. Kristiansson A. Kristiansson P. Noren B. Oskarsson A. Otterlund I. Ryde H. Westenius M. Saclay CEN DPhN Bernard V. Julien J. Laville J.L. Legraiii R. Poitou J. Uppsala Univ. Johansson T. Spokesman: Ryde, H. Contactman: Nifenecker/Jakobsson The aim of this experiment is to study various characteristics of light and heavy particle production in 12C induced reactions if possible over the whole unexplored energy region 50—86 MeV/N. In particular we want to investigate how the correlations in the multiparticle events can help us to distinguish between the existing models. Two—proton large —angle correlations and correlations between two heavier (Z = 1 or 2) particles are studied with scintillator + Nal and range telescopes, complemented with a 24 telescope sdntillator wall for projectile fragments. Thereby we receive information about the reaction plane and the impact parameter in coincidence with the two —particle correlation spectra. Small Ap correlations can also be studied. The inclusive ir+ and ir~ production has been followed far below the nucléon—nucléon threshold. Pions are thereby identified from AE —E correlations and the ir+ decay in plastic range telescopes. These results are now followed up by IT—projectile fragment and w—p correlation measurements. References PSOC/78-8/P 1, 79-2/M Î7, 79—J2/P I/ADD., 80-30/M57, 80-52/M63, PSCC/81 - 19/M 79, PSCC/82-33/M107, PSCQS3-41/M167, PSCC/85 - 24/M223 205 Schematic drawing of experiment SC 85. The vacuum vessel has been omitted and only the detectors are shown. The insert gives a detailed view of the central detector. 1) position sensitive ionisation chamber (&Q. =5o msr) 2) position sensitive avalanche detectors (Q. =2.5 ) followed by 1o plastic scintillators of the same solid angle. Inside are four dE-E solid state telescopes ( << ) , four fission detectors (F) and a small ionisation chamber (IC). 3) 0°-hodoscope consisting of 27 plastic scintillators. 5) Three Si-NaJ telescopes. Experiment SC85: Element Distribution and Multiplicity of Heavy Fragments SC85 Approved 18/JAN/1979 02/JUL/1980 Status Data-Taking Element Distribution and Multiplicity of Heavy Fragments Darmstadt GSI, Heidelberg MPI, Munster Univ. Darmstadt GSI AgnellE. HUdenbrandt K.D. Lynen U. Muller W.F. Rabe H. Sann H. Stelzer H. Wada R. Heidelberg MPI Pelte D. PochodzaUa J. Munster Univ. Brummund N. Glasow R. Kampert K.H. Santo R. Trockel R. Spokesman: Lynen, U. Contactman: Sann, H. This experiment will measure the energy and angular distribution of heavy fragments produced in the reactions of 12C on several targets between 27A1 and 238U at 86 MeV/u. The systematic investigation of a highly excited interaction region (fireball) by means of a clean N and Z identification of heavy target fragments, may result in a better understanding of temperature concept and of the degree of equilibration of the local interaction region with respect to the total system. For this investigation a large —area position sensitive ionization chamber of 50 msr solid angle in conjunction with a time —of—flight telescope consisting of parallel-plate detectors will be used. In order to get information on the transverse momentum transfer and the inelasticity of the collision, the energy of the PROJECTILE - FRAGMENTS will be measured at forward angles with a plastic scintillator hodoscope. In addition to this inclusive measurement correlations between heavy fragments will be investigated by means of three position sensitive parallel — plate detectors covering a solid angle of 2w. In order to study the dependence of the observed fragments on the primary N/Z ratio, targets of 112 118124Sn will also be used. Rtftrenta PSCQ78-34/P6, 80-29/MS6. 80-54/M6S, PSCC/81 -21/M 81, PSCC/82-42/MU3, PSCC/85- 18/M220 207 DETECTOR MANOMETER DEGRADER FARADAY CUP TO VACUM PUMP 10 cm « scale: 1/5 Experiment SC86: Study of Nuclear Collisions of 86 MeV/a.ra.u. 12C with Heavy Targets by Collection of the Heavy Recoil Nuclei SC86 Beam CJ1 Approved 17/MAY/1979 Status Completed MAR/1984 Study of Nuclear Collisions of 86 MeV/a.m.u. 12C with Heavy Targets by Collection of the Heavy Recoil Nuclei Bordeaux Univ. Bordeaux Univ. DeJagrange H. Del Moral R. Duibur J.P. Fleury A. Hubert F. Llabador Y. Mauhourat M.B. Grenoble, I.S.N. Lleres A. Spokesman: Fleury, A. Contactman: Dufour, J.P. The aim of this experiment is twofold: Firstly to test the possibilities of collection of the heavy recoil nuclei with the device presented schematically on the figure. The recoil nuclei escaping from the irradiated target are first thermalised in a gas (N2). One then takes advantage of their remaining charge to collect them with an electric field on the surface of a solid state detector. Tests already performed with other beams give absolute efficiency around 5%. The best conditions of collections with very energetic 12C have first to be tested. Secondly to get some insight into nuclear reaction mechanisms induced by 86 MeV/a.m.u. 12C using the possibilities of this recoil chamber. Two kinds of mechanisms should occur in these interactions. If the incident energy is damped (deep inelastic reaction, fusion), the heavy nucleus will be highly excited and the residual nuclei will lie along the r IT = 1 line. For heavy nuclei this line is located at about 25 mass units from the stability line. If surface interactions or any reactions leaving the heavy partner at low excitation occur (fireball interaction?), the residual nuclei will be close to the stability line. Measurement of a emitters produced in interaction with heavy targets seem to be a good test to distinguish between these two kinds of interactions. Some new neutron deficient a emitters should be also found in these reactions. References PSCC/79-8/P7. 80-3I/M58, PSCC/81 -22/M 82, PSCC/82-28/M106, PSCC/83-38/M165 209 SC87 Beam US1 Approved 20/MAR/1980 Status Data - Taking Study of Target Fragmentation in the Interaction of 86 MeV/A 12Carbon with Tantalum, Bismuth and Uranium U.C. Berkeley, Oregon Univ., Studsvik SciJR.esl.ab. U.C. Berkeley Me Gaughey P.M. Morita Y. Seaborg G.T. Oregon Univ. Loveland W. Oertel C. Studsvik Sd.Res.L-yj. Aleklett K. Rudstam G. Spokesman: Aleklett, K. Contactman: Rudstam, G. Using radiochemical techniques we will a) measure the target fragment mass and charge distributions from the interaction of 86 MeV/A 12C with Ta, Bi and U; b) measure the target fragment forward momentum and average kinetic energy using the thick target — thick catcher technique for the above reactions; and c) measure the target fragment angular and differential energy distributions using thin target —thin catcher techniques for the reactions with Ta and U. These measurements should allow us to better characterize the transition between low energy and realistic heavy ion reaction mechanisms. References PSCC80-Î8/P12, PSCQ84 - 64/M208, PSCC/85 - 29/M227, PSCC/85 - 47/M231 211 SC88 Beam US1 Approved 02/JUL/1980 Status Completed MAR/1984 Study of Reaction Mechanism in the Interaction 86 MeV/A 12C with Heavy Targets Grenoble, C£JV., Grenoble, I.SJV., Lyon Univ. Grenoble, C.E.N. Blachot J. Crancon J. Grenoble, l.S.N. Genevey - Rivier J. Gizon A. LJeres A. Lyon Univ. Marguier G, Spokesman: Blachot, J. Contactman: Blachot, J. Using the thin target — thin catcher techniques and the off— line analysis of the activities induced in the irradiated foils by means of singles and coincidences spectra recorded with Ge(Ii) y—rays and Si X — rays detectors, we will measure: 1) The target fragment mass and charge distribution from the interaction. 2) 86 MeV/A 12C with silver, tin and gold. 3) The target fragment average kinetic energy. 4) The target fragment angular and differential kinetic energy distributions. These measurements should allow us to better understand the heavy ion reaction mechanisms at intermediate energy. Référença PSCQ80-34/P 13. PSCC/81-35,M86. PSCC/82-17/M103, PSCC/82-34/M108, PSCC/82-65/M13S 213 lead glass calorimeters lead glass active converters posiiion sensitive proportional counters 10 cm Schematic drawing of the experimental set up used for the detection of neutral pions from heavy ion collisions. Experiment SC92: Subthreshold Production of Neutral Pions in Heavy Ion Collisions Approved 27/JUL/1981 Status Data —Taking Subthreshold Production of Neutral Pions in Heavy Ion Collisions Darmstadt GSI, Darmstadt TH, Frankfurt/Main Univ. Darmstadt CSI Dabrowski H. Grimm P. Grosse E. Heckwolf H. Klepper O. Matulevic J. Michel C. Mueller W.F.J. Oskarsson A. Stelzer H. Darmstadt TH BrendelC. Roesch W. Frankjvrt/Main Univ. NoUH. Spokesman: Grosse, E. The pion production below the threshold at 290 MeV/u (corresponding to the minimum beam velocity at which pions can be produced in nucléon—nucléon collisions) is sensitive to coherent effects in the momentum distribution of the nucléons in the internuclear collision region. Such collective or coherent effects would manifest themselves in an enhancement of the observed cross section with respect to a prediction on the basis of model momentum distributions, e.g. from the Fermi gas model. With neutral pions such experiments can be extended to rather low energies and rather small cross sections (in the sub-/xb range) due to the fact that the w°'s leave the composite nuclear system undisturbed by the Coulomb forces and that their decay gamma rays can be detected with high efficiency also at very low pion momentum. In our experiments using 12C ions of 60, 74 and 84 MeV/u and 180 of 84 MeV/u we were able to clearly separate these gamma rays from background from different sources. The large efficiency of the annular lead glass detector set - up allowed the measurement of production rates from a number of target nuclei at the different beam energies. At the lower energies the measured cross sections are surprisingly high and exceed calculations on the basis of the Fermi gas model. To further study this possible collective enhancement we therefore propose to first extend the measurements to lower energies, i.e. 48 and possibly 40 MeV/u, and to look for target and projectile fragments in coincidence with neutral pions in a later run. References PSCC/81 - 57/P 48, PSCC/82-40/M1U, PSCC/84-21/M189, PSCC/85-19/M221 215 Scintillators s Samples ,. r? Pressure inlet Stainless steel Detector arrangement and high pressure cell for ySR- measurements at room temperature. A pressure cell for low temperatures is under construction. Experiment SC93: uSR-measurements Under High Pressure and at Low Temperature Approved 27/JUL/1981 17/JUN/1982 Status Data-Taking - Measurements under High Pressure and at Low Temperatures Grenoble, C£JV., Munich TU, Uppsala Univ. Grenoble. C.E.N. Chappert J. Munich TU Ash L. Butz T. Kalvius G.M. Uppsala Univ. Hartmann O. Karlsson E. Wappling R. Spokesman: Kalvius, G.M. Contactman: Hartmann, O. High pressure causes changes in the volume available to each atom in a solid and will therefore influence local properties like the electronic charge and spin densities and, in the case of magnetic materials, the spin ordering. The positive muon is known to be an interesting probe particle for the study of certain problems in magnetism. It has in fact been used for one high pressure experiment earlier in CERN, but the present experiments aim at more systematic studies. For this purpose it is necessary to carry out pressure experiments at low temperatures. The new experiments will use a helium gas pressure system, which will cover the temperature range 5 — 300 K at pressures up to 14 Kbar. Experiments are planned on 1) Rare earth metals, like gadolinium, where the muons will be affected by the spin density far off the centres of the atomic sites. The volume dependence of this density can be predicted to be quite large. 2) So-called weak itinerant magnets, like ZrZn2, where the ferro- magnetism is not due to localized moments. Their magnetic properties are often very sensitive to volume changes. 3) Short-range spin correlation effects between paramagnetic moments in, for instance, rare earth intermetallic compounds in the series (RE)A12. References PSCC/81-49/P46. PSCC/82-23/M10S, PSCC/83-20/M1S6, PSCC/83-S0/M171 217 M M fl 01 /MTA Suction AA i SUntiUatoA. M Magnet C Coltbnoutofi Experiment SC95: Muons and Muonium in Molecular Physics MUSR SC95 Beam CJ2 Approved 18/NOV/1982 Status Data—Taking Muons and Muonium in Molecular Physics CERN, Leicester Univ., Rutherford Appleton Lab. CERN Hill A. Leicester Univ. Symons M.C.R. Rutherford Appleton Lab. Cox S.F.J. Spokesman: Symons, M.C.R. Contactman: Cox, S.F.J. The aim of this experiment is to gain some insight on the most fundamental processes involved in the reaction of muons and muonium with organic molecules. Two components of the /iSR signal in an organic sample can be identified: a diamagnetic fraction precessing at (or very close to) the Larmor frequency and a paramagnetic fraction giving rise to frequencies characteristic of the muon's coupling with an unpaired electron spin. /; DIAMAGNETIC FRACTION We intend to study the occurence of an acid — base reaction of the type: (i+ + B - (MuB) + and its competition with reactions that produce muonium. The best suited model systems for this process are aqueous solutions in which muon and electron scavengers, or anionic bases, in high concentration can be added. In order to further distinguish between different types of (MuB)+ species the chemical shifts of these products will be studied. 2) PARAMAGNETIC FRACTION Work will continue on muonic radicals formed by muonium addition at a carbon - carbon or carbon - oxygen double bond, especially where the corresponding protonic radicals are unknown in ESR work. We intend also to study the possibility of muonium bridging. Radicals formed by addition at triple bonds will also be studied. The experiment will make use of the facilities provided by the /nSR collaboration (SC65, 76, 81, 82). In particular, precision frequency measurements will be performed on the SC proton hall spectrometer while precise determination of the amplitudes of different signals will be done with the wire—chamber spectrometer in the SC neutron hall. References PSCC/82 - S5/P61. PSCC/83 - 49/M170, PSCC/83 - 50/M171 219 THIN DIORITE SPHERE Fe-CYLINDER TARGETS R = 5cm ( 0 = 30 cm) 1 1 1 1 1 i 1 1 1 1 1 1 1 1 a i 600 MeVj 1 1 1 i • 1 1 1 •1 !i •i p-BEAM 1 1 1 1 i 1 I 1 I 1 1 1 • 1 ' 1 i Al 104 cm MOVEMENTS OF THE TARGET 1 VERTICAL . 50cm . 3.3cm /min 2 HORIZONTAL . 48cm ,11.0cm /min 3 ROTATION . 2JT . 2 rpm ROTATION , 2JT . 5 rpm A Fe - TU8E , INNER DIAMETER 1.9 cm . CONTAINING 9 SAMPLE STACKS B LENGTH OF ARRANGEMENT 126 cm A irradiation of the first run for a R=5 era sphere and an Fe-beamstop. B experimental set-up for the second and third irradiation of R=25 and 15 cm spheres. The homogeneous 4TT irradiations were achieved by superposition of 2 rotational and 2 translational movements. Experiment SC96: 600 MeV Simulation of the Production of Cosmogenic Nuclides in Meteorites by Galactic Protons METEORITES SC96 Beam MP5 Approved 03/FEB/1983 Status Completed DEC/1984 600 MeV Simulation of the Production of Cosmogenic Nuclides in Meteorites by Galactic Protons Ahmedabad, PRL, Bordeaux Univ., Cologne Univ., Julich KFA, Mainz MPI, Zurich E.TJÎ. Ahmedabad, PRL Rao M.N. Bordeaux Univ. Lavielle B. Cologne Univ. Dragovitsch P. Englert P. Herpers U. Michel R. Peifier F. Theis S. Julich KFA Amjan W. Cloth P. Filges D. Paul N. Main2 MPI Begemann F. Schultz L. Weber H.W. Zurich E.T.H. Signer P. Wieler R. Spokesman: Michel, R. Contactman: Michel, R. A large variety of stable and radioactive nuclides is produced by the interaction of solar and galactic cosmic rays with extraterrestrial matter. Measurements of such cosmogenic nuclides provide information about the constancy of cosmic ray fluxes in space and time and about the irradiation history of individual extraterrestrial objects provided that there exist reliable models describing the production process. For the calculation of the depth dependent production of cosmogenic nuclides in meteorites no satisfactory models exist up to now. Therefore, the irradiation of small stony meteorites (radii < 40 cm) by galactic protons is simulated in a series of thick target irradiation experiments at the 600 MeV proton beam of the SC. The thick targets are spheres (R = 5, 15, 25 cm) and are made out of diorite because of its low water content, its high density (3.0 g/cm3) and because it provides a good approximation of the chemical composition of some common meteorite classes. These spheres will also contain a wide variety of pure element foils. Combining the thick target approach with a second one based on the measurement of thin target cross — sections and on the evalutation of depth dependent primary and secondary nucléon spectra, the experiments will give information on: - depth profiles of the production rates of cosmogenic radionuclides (A < 60), — depth profiles of the production of stable rare gas isotopes, - the spatial and energy distribution of secondary particles, — thin target cross — sections for the production of radionuclides from 14 target elements. All these data will provide a basis for the interpretation of cosmogenic nuclides in meteorites with respect to their irradiation history. Simultaneously, HET model calculations of the secondary particle fluxes in the spheres and inside a thick iron target are checked in a simple geometry. The iron target is a 30 cm diameter, 35 cm long cylinder instrumented with several pure element foils to measure specific nuclear reactions. The information obtained in this experiment will help both in the verification of cross — section calculations and the interpretation of cosmogenic nuclides. References PSCC/82-88/P65. PSCC/8S-1S/M218 221 Perspective view of the isotope on-line separator, ISOLDE. The 600 MeVproton beam (II from the CERN synchro-cyclotron is focused on the target ion source unit (2). A beam of radioactive ions is formed by a 60kV acceleration stage and is mass analyzed in a magnet 13). Individual masses are then selected by electrostatic deflection in the switchyard (4) and distributed through the external beam-lines (SI to the various experiments. These are: (6) Nucleer spectroscopy (a, p, Y) 17) High resolution mass spectrometer (8) Optical pumping and laser spectroscopy (9) Atomic beam magnetic resonance (101 Collection of radioactive sources for off-line work (hyperfine interactions in solids, determination of shifts in X-ray energies, targets for nuclear reaction studies) 111) Beta delayed particles (12) Range measurements of ions in gases ISOLDE Programme ISOLDE Beam US1 Approved 17/APR/1974 09/APR/1975 23/MAR/1979 19/MAR/1981 Status Data-Taking ISOLDE PROGRAMME CERN, Isolde Collaboration Aarhus Univ. Hansen P.G. Nielsen K. Nyiandsted Larsen A. Riisager K. Weyer G. Atlanta Inst. of Tech. Wood J.L. Bergen Univ. Bjornstad T. Lovhoiden G. Nybo K. Thorsteinsen T.F. U.C. Berkeley Price P.B. Berlin( W) HMI Benschat H.H. Haas H. Hunger E. Stenzel C.H. Berlin( IV) FU Marx V. Menningen M. Ber!in(W) TU Novak Z. Bombay, Bhabha Atomic Res.Centre Ahmad S.A. Venogupalan A Bonn Univ. Bodenstedt E. Daemmrich U. Freitag K. Herrman CD. Herzog P. Penselin S. Schloesser K. Caen, GANIL Guillemaud - Mueller D. Mueller A.C. Chalk River Nucl. Lab. HagbergE. Hardy J.C. Copenhagen Niels Bohr Inst. Hoick O. Lindahl A. Nielsen O.B. Sidenius G. Daresbury Lab. Walker P.M. Darmstadt GSI Klepper O. Kuehl T. Plochocki G.A. Roeckl E. Rykaczewski K. Schardt D. Sekine T. Darmstadt TH Richter A. Gent, State Univ. Heyde K. Sevrin A. Glessen Justus Uebig Univ. Anil M. Bloennigen F. Geisse C. Laue H.J. Lippert W. Wollnik H. Gothenburg Univ. Jonson B. Mattsson S. Nyman G. Rydehell M. Skeppstedt O. Tengblad O. Grenoble, I.S.N. Genevey - Rivier 1. Gronlngen Univ. Andreasen H. Kemerink G.J. Jullch KFA Kleinheinz P. Rubio B. Sistemich K. Kassel GHS Fricke B. Konstani Univ. Hofsiess H. Lindner G. Recknagel E. Refertnces PH 111-72/27, 73/15, 74/16, 74/49, 75/6, SCC/76-2, SCC/78-3/P2, PSCC/78-8/P 5, 79-12/M19. 79-39/M31, 79-40/M32, 80-22/MS2, PSCC/80-27/M 55, 80-40/M62, PSCC/80-126/M 70. PSCC/80-138/M 73. PSCC/81-1/M74. PSCC/81-23/M83, PSCC/81-25/M 84, PSCC/81 - U/P 38, PSCC/81-40/M 87, PSCC/81-41/M 88, PSCC/82 - :0/M98, PSCC/82 - 11 /M99, "SCC/82-54/M121, PSCC/82-61/M123 223 ISOLDF Lisbon Nat.Inst.Sci.Res. Soares J.C. Louvain Cath. Univ. Vanneste L. Lyon Univ. Berkes I. Carre M. Giroux J. Lerme J.C. Marest G. Marguier G. Morgue M. Sau J. Vialle J.C. Madrid Univ. Campos J. Poves A. Madrid J.E.N. Ortiz M. Rodriguez - Yunta A. Maim Univ. Ames W. Arnold E. Bauer D. Bullen G. Bonn J. Borchers W. Dinger U. Dohm A. Eberz J. Egelhof P. GaL-Imann H. Gegenwart R. Gruener J. Harms V. Homer S. Hill P. Huber G. Kaffrell N. Kalinowski H. Kern F. Kratz K.L. Kroenert U. Leist B. Lindenlauf F. Lochmann H. Menges R. Neu W. Neuj;art R. Neugebauer F. Otten E.W. Passler G. Ruster W. Stolzenberg H. Schnatz R. Schluz C. Schweikhard L. Stampp W. SteinmuelJer B. Wallmerolh K. Wiescher M. Wilde W. WolfV. Schoeder A. Ziegert W. McMaster Univ. Berdichevski D. Sprung D.W.L. Montreal McGill Univ. Buchinger F. Moore R.B. Ramsay E.B. Munster Univ. Geise J. Mehrer H. Stolwijk N. New York Univ. Stroke H.H. Orsay l.P.N. Sauvage J. Orsay, Aime Cotton Lab. Duong H.T. Juncar P. Liberman S. Pinard J. Orsay C.S.N.S.M. AudiG. CocA. De Saint -Simon M. Liang CF. Paris P. Rey - Campagnolle M. Thibault C. Touchard F. Oslo Univ. Alstadt J. Engelsen S. Hagebo E. HofT P. Oxford Univ. Green V.R. Rikovska J. Stone N.J. Paris, IN2P3 Serre C. Princeton Univ. Calaprice F. Clayhold J. Happer W. Kitano M. Musolf M. Naumann R.A. Sacavem LNET1 Da Silva M.F. Simon Fraser Univ. D'Auria J. Saclay CEN DPhPE Pesnelle A. SnasbourgjC.R.N. Bader W. Baumann P. Bordet P. Dessagne P. Dissert R. Huck A. Klipfel M. Klotz G. Knipper A. Miehe C. Walter G. Ramdane M. Zuker A. Stockholm Res. Inst. Bergstrom I. Blomqvist J. Studsvlk Sci.Res.Lab. AJeklett K. Ekstiom C. Rudstam G. Warsaw Univ. Kurcewics W. Zylicz J. Zurich Univ. Petersen J.W. Holzschuh E. Kuendig W. CERN Burke D. Garcia - Borge M. Jonsson O.C. KlugeH.-J. Kugler E. Ravn H.L. Sundell S. UlmG. Vosicki B. Wendt K. Spokesman: Thibault, C. Contactman: Kluge, H. — J. 225 ISOLDE The experiments aim at a broad exploration of the properties of atomic nuclei far away from the region of beta stability. Furthermore, the unique radioactive beams of over 60 elements produced at ISOLDE are used in a wide programme of atomic, solid state and surface physics. Around 180 scientists are involved in the project, coming from about 50 laboratories. An electromagnetic isotope separator is connected on — line with a production target in the 600 MeV extracted proton beam of the Synchro — Cyclotron. Secondary beams of radioactive isotopes of about 60 elements are available at the facility in intensities of 1O10 —1011 atoms/sec in favourable cases. The measuring equipment is placed around the four extracted ion-beam lines in the underground experimental area (UR8). Two of the beam —lines are extended to low — background measuring stations in the two upper floors (UR9 and UR10). A new separator is under construction in the SC proton hall. ISOLDE experiments in operation or under way cover the following subjects: — Ground —state spins, moments and isotope shifts. — Atomic and nuclear effects in the energies of K X — rays. — Nuclear masses and decay energies. — Beta-delayed particle emission; statistical decay properties. — Exotic decays. — Light elements, isospin symmetries. — Ground — state alpha widths. — Detailed nuclear level schemes. — Determination of the rest mass of»' (the electron neutrino). — Preparation of radioactive targets for accelerators and intense neutron beams. — Solid state physics by perturbated angular correlations. — Mossbauer spectroscopy, channelling, and diffusion studies. — Surface physics. — Atomic physics in unstable elements. — Intense positron sources. 227 193 :,eU.ciGrs used in the * Pt experiment : a LÙQ mm * 6 mm intrinsic Ge and a hOO mm * 6 mm Hal. Shielding : cupper, cadmium and lead. 14 Source : 10 atoms placed in a cadmium holder. 193 Pt source 193 Pt bremsstrahlung spectra measured in singles and in coincidence with L X-rays (2P). The curves show the calculated spectral shapes (De Rûjula-Glauber-Martin theory) on an absolute scale. Experiment IS10: Determination of the Electron Neutrino Mass from Experiments on Electron-Capture Beta-Decay (EC) ISOLDE/NEUTRINO 1S10 Beam US1 Approved 22/APR/1982 Status Data-Taking Determination of the Electron Neutrino Mass from Experiments on Electron - Capture Beta - Decay (EC) Aarhus Univ., CERN, Isolde Collaboration, Lund Univ., Roskilde, Tamdem Accelerator Aarhus Univ. Andersen J.U. H arisen P.G. Laegsgaard E. CERN Anderson D.F. Charpak G. De Rujula A. Ravn H.L. Lund Univ. Gustafsson H.A. Roskilde, Tamdem Accelerator Elbek B. Knudsen P. Pedersen J. Rossendorf ZfK Beyer G.J. Chalmers Untv of Technology Jonson B. Spokesman: Jonson, B. Contactman: Jonson, B. The aim of the programme is to measure the electron neutrino mass, for which at present an upper limit of 4.1 keV is known. The experiment studies the shape of the internal bremsstrahlung spectrum in electron — capture near its upper end — point and deduces a mass from small shape changes completely analogous to those in the well—known determination of the electron antineutrino mass in the tritium beta —minus decay. In a low—energy bremsstrahlung process, the capture takes place from a virtual S state associated with a radiative P -» S electromagnetic transition, and the resonant nature of the process leads to important enhancements of the photon intensities at low energy, in particular near the resonance energies corresponding to P-* S transitions (X-rays). This effect gives this type of experiment a chance to compete with experiments on continuous beta spectra. The programme concentrates on two long — lived isotopes: 1) 193Pt which will serve to verify the predicted resonance effect. The experimental set —up and a first analysis based on a small set of data is shown in figure 1. 2) 163Ho. The Q value for this isotope has been found to be 2.58 ± 0.10 keV. A detector specially constructed for the measurement of radiations of very low energy is under construction. References PSCQ82 - 7/M97 229 1 Entrance port for ion beam 2 Movable Faraday cup 3 Target in implantation position 4 Rotatable target holder (14 positions) cooled by liquid nitrogen 5 Lamp for target heating (annealing) 6 Vibrating Mossbauer-resonance detector Experiment IS2O: Mbssbauer Studies of Implanted Impurities in Solids ISOLDE IS20 Beam US1 Approved 22/APR/1982 Status Data—Taking Moessbauer Studies of Implanted Impurities in Solids Aarhus Univ., Groningen Univ., Isolde Collaboration Aarhus Univ. Danielsen E. Nielsen K.B. Nylandsted Larsen A. Pedersen F.T. Sondergaard M. Weyer G. CERN Petersen J.W. Groningen Univ. Andreasen H. Kemerink G.J. Spokesman: Weyer, G. Contactman: Weyer, G. This experiment aims at an understanding of basic microscopic properties of solids as measured using suitable radioactive probe atoms. Moessbauer studies are performed on implanted radioactive impurities in semiconductors and metals. Radioactive isotopes (from the ISOLDE facility) decaying to a Moessbauer isotope are utilized to investigate electronic and vibrational properties of impurities and impurity — defect structures. In semiconductors isoelectronic, shallow and deep level impurities have been implanted. Complex impurity defects have been produced by the implantation process (correlated damage) in both semiconductors and metals. The annealing mechanism of the defects have been studied in detail. Due to the recoil energy imparted to the daughter nucleus in the decay of the parent element defects may be created. However, the recoil energy must exceed the typical displacement energies (10— 30 ev) which for most of the applied radioactive parent nuclei is not the case. In one case (I19Xe) recoil energies of =*100 ev occur. In fact simple defects (interstitials and impurity — vacancy pairs) are produced by this mechanism and have been detected in silicon, germanium, a — tin and in f.c.c. metals. References PSCC/82 - 10/M98. PSCC/83-23/M157 231 ^Detector Surface Experiment ll1 PAC Oven( Cd) at ISOLDE 2 X 1/1 {Cd on Mo(110)} Auger spectrometer Sputter gun Single crystal Deflector specimen 77K 77K ISOLDE Beam line Manipulator Turbo Rest gas analysis Pump -6 -7 2x10 10 2x10 3x10~"Tor-11 r Experiment IS30: PAC Experiments at ISOLDE ISOLDE IS30 Beam US1 Approved 22/APR/1982 Status Data-Taking PAC Experiments at ISOLDE Berlin(W) HMI, Berlin(W) FU, Berùn(W) TU, Isolde Collaboration Berlin(W) HMI Bertschat H.H. Haas H. Hunger E. Stenzel C. Berlin( W) FU Marx V. Menningen M. Berlin(W) TU Novak Z. Spokesman: Haas, H. Contactman: Jonson, B. The study of hyperfine interactions offers the possibility to use radioactive nuclei as probes in matter. The y — y perturbated angular correlation (PAC) technique following implantation has found widespread application in this field. At ISOLDE we have been investigating electric field gradients at impurities in non — cubic metals in an ongoing series of experiments. The small number of probe atoms necessary for these measurements make them also ideally suited for studies of surface problems like diffusion, structure and dynamics. Cd on a molybdenum [110] surface will be studied as first system. For this purpose 1010 atoms of llimCd will be evaporated onto the clean surface and the electric field gradient for isolated adatoms on terrace sites will be determined by PAC. The UHV system constructed for such experiments at ISOLDE is shown in the schematic drawing. It is coupled to the beam line through differential pumping stations and contains standard surface treatment and analysis equipment. References PSCC/82-11/M99 233 50 150 Top view of the ABMR apparatus connected on-line with the ISOLDE iso- tope separator. (1) Beam line from the separator, (2) off-line collec- tion position, (3) electrostatic deflector, (4) beam line continuing to the collinear fast-beam laser experiment, (5) beam scanner, (6) au- tomatic valve, (7) electrostatic quadrupole triplet, (8) oven section, (y) sixpole polarizing magnet, (10) dipole magnet and rf-loop, (11) fourpole analysing magnet, (12) collector section, (13) collector disc feeder and (14) detector section. The lower part of the figure shows the beam space of the ABMR apparatus, including a beam bundle of atoms in resonance. Experiment IS40: ABRM Experiments at ISOLDE ISOLDE IS40 Beam US1 Approved 17/JUN/1982 Status Data—Taking Atomic - Beam Magnetic Resonance Experiments at ISOLDE Gothenburg Univ., Isolde Collaboration Gothenburg Univ. Bengtsson C. Ekstrom C. Lindgren I. Spokesman: Ekstrom, C. Contactman: Kluge, H. —J. The aim of the atomic —beam magnetic resonance (ABMR) experiments at ISOLDE is to map the nuclear behaviour in wide regions of the nuclear chart by measuring nuclear spins and moments of ground and isomeric states. This is made through an investigation of the atomic hyperfine structure of free, neutral atoms in a thermal atomic —beam using radio — frequency techniques. On—line operation allows the study of short — lived nuclei far from the region of beta — stability. 2 The ABMR experiments on the Sn 2 elements Rb, Cs, Au and Fr have been completed, and present efforts are directed towards the elements with an open p — shell and on the rare — earth elements. The experimental data obtained are compared with results from model calculations, giving information on the single — particle structure and on the nuclear shape parameters. References PSCC/82-22/M104 235 BETA TELESCOPE E. Counter A E. Counter (100mm) (0.5mm) NEUTRON COUNTER (NE 110 : 160 «18 «1.25 cm3) Ge-Li y COUNTER COUNTER ( NE 102 Thickness:1mm NEUTRON COUNTER NE 110 : 160x18 x1.25 cm3) Experiment IS5O: Spectroscopir. Studies of Exotic Nuclei at ISOLDE ISOLDE IS50 Beam US1 Approved 17/JUN/1982 Status Completed DEC/1983 Spectroscopic Studies of Exotic Nuclei at ISOLDE Lyon Univ., Madrid JJEJV., Paris, IN2P3, Strasbourg Univ., Isolde Collaboration Lyon Univ. Marguier G. Morgue M. Madrid J.E.N. Poves A. Paris. IN2P3 Richard - Serre C. Strasbourg Univ. Huck A. Klotz G. Knipper A. Miehe C. Rachidi J. Walter G. Spokesman: Knipper, A. Contactman: Serre, C. Experiment IS50 is designed to: a) Investigate the full range of the j3 strength function of heavy (A > 48) K nuclei b) Study the decay of isomeric states in n —deficient bromine nuclei (A = 72 and 70). The heavy K isotopes appeared to have complex decay schemes, including feeding by the /? — decay of levels having open neutron channels (Beta decay energy Q(j8) exceeds neutron binding energy S ); in addition, a large fraction of the delayed neutron transitions populate excited levels in the daughter nuclei. The allowed /3 — decay selects states in the daughter nucleus with wave functions having a large overlap with the initial state. Hence, the P strength functions, deduced from these decay schemes, reveal simple structures correlated to the particle — hole excitation energies in the Ca nuclei. These results are valuable for the application of the shell - model calculations far from stability. The delayed neutron spectra are measured with a large area curved scintillator in coincidence either with high resolution Ge(Li) detectors, for gamma spectroscopy, or with a beta telescope, for Q()3) — measurements. For the study of the decay of isomeric states in h — deficient bromine nuclei, the detectors used are Ge(Li) and Si(Li) counters, for simultaneous measurement of y rays and electrons, allowing internal conversion coefficient determinations. These data will be used to construct the decay schemes (including spin and parity assignments) for Br and Se nuclei. Isomeric states thus serve to locate directly isolated shell-model states of high spin. References PSCC/82 - 14/M100, PSCC/82 - 15/M101 23 7 ISOLDE IS60 Beam US1 Approved 18/NOV/1982 Status Completed JUL/1983 Continuation of Mass Determinations through a Double Focusing Mass Spectrometer on Line with ISOLDE Orsay C.SJV.SM., Isolde Collaboration Orsay C.S.N.S.M. Audi G. CocA. Rey - Campagnolle/Epherre Mueller A. Thibault C. Touchard F. Spokesman: Epherre, M. Contactman: Epherre, M. In a previous experiment (1976 — 77) we have demonstrated the interest and feasibility of atomic mass determinations from the direct measurements of mass ratios on Rb, Cs and Fr isotopes. Masses of long series of isotopes on both side of stability were determined with an accuracy of a few tens to 300 keV (for the more exotic). Interesting nuclear structure features could be observed as for example the indication for an onset of deformation, at N = 60 for Z = 37, which stimulated further experiments and theoretical calculations. The many mass values, until then unknown, we obtained in our experiments, gave in addition the possibility to make detailed tests of the nuclear mass predictions. Due to improvements on our mass spectrometer (better transmission and higher resolving power) and increased ISOLDE production yields, some new and valuable measurements can be performed. We plan: a) to continue the measurements towards even heavier isotopes and explore the deformation regions which start at 97Rb and 146Cs; b) to measure the masses of neutron - rich K isotopes beyond N = 28; c) to improve the precision of Na masses up to 31Na so that the new method we used in experiment PS 162, to measure the masses of the very neutron rich isotopes through their beta —delayed neutron emission, can be checked together with the onset of deformation indicated at N = 20: d) to study the few discrepancies between our fonner results on the very neutron deficient Cs isotopes and data obtained from decay energy measurements; e) to perform tests on hallogen isotopes. References ?SCC/82 - S8/P62, PSCC/83 - S/M151 239 Thermal atomic beam 60keV 1OkeV ionic beam I magnet I ionic beam Tunable cwj dye laser Electron Mass multiplier spectrometer Experiment IS70: Continuation of Atomic Spectroscopy on Alkali Isotopes at ISOLDE ISOLDE IS70 Beam US1 Approved 18/NOV/1982 Status Completed JUL/1985 Continuation of Atomic Spectroscopy on Alkali Isotopes at ISOLDE Orsay C.SJV.SM., Orsay, Aime Cotton Lab., Isolde Collaboration Orsay C.S.N.S.M. Coc A. Thibault C. Touchard F. Orsay, Aime Cotton Lab. JLinear P. Liberman S. Pinard J. Lyon Univ. Lerme J. Vialle J.L. Bonn Univ. Buttgenbach S. Saclay CEN DPhPE Pesnelle A. CERN Duong H.T. Caen, GANIL Mueller A. Spokesman: Thibault, C. Contactman: Duong, H.T. Laser optical measurements on Rb, Cs and Fr have already been performed at ISOLDE in 1978 — 79. The hyperfine structure and isotope shift of 76-98Rb, U8-145Cs, "s-^Fr and 14 of their isomers have been studied. Among the wealth of information which has been obtained, the most important are the first observation of an optical transition of the element Fr, the evidence of the onset of nuclear deformation at N = 60 for Rb isotopes and the shape isomerism in neutron — deficient Cs isotopes. From both the atomic and nuclear physics point of view, new studies seem very promising: — the search for new optical transitions in Fr; the shell effect in the rms charge radius at N = 126 for Fr isotopes — the study of a possible onset of deformation for Cs isotopes beyond 14SCs — the study of a region of static deformation in neutron — deficient Rb isotopes. A new apparatus has been built. The principle remains the same as used in our earlier experiments. The improvements concern essentially the interaction region of the atomic beam and the laser. In addition, a new broad — band laser dedicated to the search for the optical transitions of Fr has been built. References PSCC/82 - 63 /P63. PSCC/84 - 38/M199 241 Target Separator Laser Deflector Quadrupole Retardation Charge-exchange cell Observation region Ion soure* magnet beam triplet system Proton beam Cylindrical mirror Schematic view of the experimental see-up including the ISOLDE mass separator and the apparatus for collinear-beam spectroscopy. A simplified block diagram of the electronics, and of the control and data-taking systems is given at the bottom. Experiment IS80: Study of Nuclear Moments and Mean Square Charge Radii by Collinear Fast-Beam Laser Spectroscopy ISOLDE IS80 Beam US1 Approved 18/NOV/1982 Status Data-Taking Study of Nuclear Moments and Mean Square Charge Radii by Collinear Fast - Beam Laser Spectroscopy Mainz Univ., Bombay, Bhabha Atomic Res.Centre, CERN, Gothenburg Unh., New York Univ., Isolde Collaboration Mainz Univ. Borchers W. Neugart R. Neugebauer F. Otten E.W. Bombay, Bhabha Atomic Res.Centre Ahmad S.A. CERN Duong H.T. Ulm G. Wendt K. Gothenburg Univ. Ekstrom C. New York Univ. Stroke H.H. Spokesman: Neugart, R. Contactman: Wendt, K. The collinear fast — beam laser technique is used tc measure atomic hyperfine structures and isotope shifts of unstable nuclides produced at ISOLDE. This gives access to basic nuclear ground —state and isomeric — state properties such as spins, magnetic dipole and electric quadrupole moments, and the variation of the nuclear mean square charge radius within a sequence of isotopes. Among the various techniques used for this purpose, the present approach is of greatest versatility, due to the direct use of the beams from the isotope separator. Their phase - space properties are exploited to achieve high sensitivity and resolution. The optical spectra of neutral atoms are made accessible by converting the ion beams into fast atomic beams. This is accomplished in the charge — exchange cell which is kept at variable potential (± 10 kV) for Doppler - tuning of the effective laser wavelength. The basic optical resolution of 10 "8 requires a 10 ~s stability of the 60 kV main acceleration voltage and low energy spread of the ion sources. Present experiments concentrate on (1) a systematic study of the transition from spherical to strongly deformed nuclear shapes above the neutron number N = 82 in the region of neutron — deficient isotopes of the rare-earth elements; (2) the heavy elements, e.g. radium for which the first ever measurements of hyperfine structures and isotope shifts have also an important atomic - physics aspect; (3) the rare gas elements (krypton, xenon, radon) for which a new sensitive ion — detection technique is being developed. References PSCC/82 -61/M123, PSCC/84 - 47/M203 243 axiol field strength |. I FABRr*i. Y PEROT SOOIUH VAPOUR CELL TELLURIUM ' SOLENOID ISHIELDED) CELL FOCUSED VOLUME particle multiplier LASER mirror FILTER neutral density filter PHOTOMULTIPLIERi- U» ELLIPSOIDAL energy-cnalyzer MIRROR Experiment IS81 : Laser Spectroscopy at Z = 50 ISOLDE ISS1 Beam US1 Approved 15/NOV/1984 Status Data-Taking Laser Spectroscopy at Z = 50 CERN, Darmstadt GSI, Mainz Univ., Isolde Collaboration CERN Ulm G. Wendt K. Darmstadt GSI KuehJ T. Mainz Univ. Dinger U. Eberz J. Huber G. Menges R. Neugart R. Spokesman: Huber, G. Contactman: Ulm, G. The purpose of this experiment is the extension to neutron rich nuclides around Z = 50 of studies performed at GSI with HI fusion products. The neutron rich isotope chain of indium from a 238U target with surface ionization (and when operational also tin and cadmium with a plasma ion source) allows to follow the polarization effects in nuclear volume seen as deviation of the isotope shift from the droplet model prediction. These elements exhibit a rich spin isomerism which gives an independent access to nuclear polarization via the isomer shift. Magnetic moments and quadrupole moments are known now for 105~U7In groundstates and the odd 109"125Sn isotopes. The spectroscopic quadrupole moments for the I > 1/2 isotopes are known as well. Collinear laser spectroscopy is performed with fluorescence and in special cases as two — photon spectroscopy with field—ionization detection. References PSCQ84-S0/P77 245 ISOLDE IS82 Beam US1 Approved 15/NOV/1984 Status Preparation Multiphoton Ionization Detection in CoIIinear Laser Spectroscopy of Isolde Beams CERN, Mainz Univ., Troitzk, Inst. of Spectroscopy, Isolde Collaboration CERN Ulm G. Wendt K. Maim Univ. Neugart R. Otten E.W. Troil2k, Inst. of Spectroscopy Letokhov V.S. Mishin V.I. Spokesman: Otten, E.W. Contactman: Ulm, G. Multiphoton ionization spectroscopy has been successfully applied to weakly — produced isotopes of the rare —earth elements for the Gatchina (USSR) isotope separator. While the sensitivity of these experiments is very high, the spectral resolution is limited by Doppler broadening and the pulsed high — power lasers. The present proposal aims at a combination of the advantages of collinear fast —beam laser spectroscopy (high resolution) and multiphoton ionization detection (low background and possibly higher efficiency). The fast —beam experiments at ISOLDE are using a narrow —band low —power laser for the first excitation step. This scheme will be applied for a continuation of previous isotope shift and nuclear moment measurements in Eu, Tm and Yb towards more neutron — deficient isotopes. References PSCC 84 - 52 P78, PSCC/84 - 37/168 2-'. 7 T 019 s 132In \3" Qp= 14 MeV 7210 2379 7 2268 3 (48) (29) 1115 (5") (7) 132.0 4942 • < J " "\5264 (JJ) o 4847 4830 (4-) " \G4> V 479 1 \ 20 ns (37) \ 3" (9?) 435) 4416 4.0 ns 374.7 4* (113) 2' 4041 4351.3 4040.6 4415 8 (40) (100) (13) 0* 132 Sn 132 Level scheme of 132Sn. Energies are given in keV. Relative gamma intensities are given in parenthesis. Experiment IS90: Study of the Doubly-Closed Shell Nucleus 132Sn and its Valence Nuclei ISOLDE IS90 Beam US1 Approved 03/FEB/1983 Status Completed NOV/1984 Study of the Doubly - closed Shell Nucleus 132Sn and its Valence Nuclei Bergen Univ., CERN, Isolde Collaboration, Darmstadt GSI, Gothenburg Univ., Julich KFA, Kingston Queens Univ., Stockholm Res. last. Bergen Univ. Lovhoiden G. CERN Von Dincklage R.D. Darmstadt GSI Klepper O. Schardt D. Gothenburg Univ. Mattcson S. Nyman G. Julich KFA Sistemich K. Kingston Queens Univ. Ewan G.T. Stockholm Res. Inst. Blomqvist J. Kerek A. Nagoya Univ. Kawade K. Studsvik Sci.Res.Lab. HofFP. Chalmers Univ of Technology Jonson B. Spokesman: Blomqvist, J. Contactman: Jonson, B. The aim of the experiment is to study the level structure of nuclei close to the shell closures (Z.N) = (50,50) and (50,82). The decay of the isotopes 98Cd, 132In, 133In and131Cd are invesigated by means of gamma; electron— and neutron spectroscopy. Gamma —gamma and electron — gamma coincidences are also recorded. The experimental equipment (Ge(Li) detectors, Si(Li) detectors and 3He neutron spectrometers) are connected on —line to the ISOLDE on—line isotope separator. References PSCC/83-1/M149 249 ARRANGEMENT OF MINI-ORANGE SPECTROMETER IN SET-UP. ^-electron detector tape-drive tope - detector Fig. A. Top view showing geometry of orange spectrometer, beam tube and tape system. The tape system moves the radioactive ions in front of the detectors. Y-detector tape with source electron detector cold finger p-detector Fig. B. Side view showing the geometry of the 8-detector and two y-detectors. Experiment IS100: Studies of Stable Octupole Deformations in the Radium Region ISOLDE IS 100 Beam US1 Approved 02/FEB/1984 Status Data—Taking Studies of Stable Octupole Deformations in the Radium Region Bergen Univ., CERN, Chalmers Univ of Technology, Mainz Univ., Warsaw Univ., Isolde Collaboration Bergen Univ. Lovhoiden G. Nybo K. Thorsteinsen T.F. CERN Burke D.G. Garcia-Borge M. Chalmers Univ of Technology Mattsson S. Nyman G. Mainz Univ. Hill P. KafFreUN. Warsaw Univ. Kurcewicz V. Princeton Univ. Naumann R.A. Spokesman: Lovhoiden, G. Contactman: Jonson, B. The purpose of the present project is to locate and identify states in the atomic nuclei possessing stable pearshaped octupole deformation. Such states, formally related to the structures known in molecular physics, manifest themselves as families of parity doublets in odd nuclei. The best possibilities for observing stable octupole deformations are offered in the Ra —region. Both theoretical calculations and experimental indications support such expectations. Such indications are the non — observation of two — phonon octupole vibrational states in the ISOLDE studies of the even — even radium nuclei, and the reversed sign of the decoupling factor of the ground state band in 225Ra observed in the single — neutron transfer reactions. In order to establish the predicted strong E3 — transitions between the parity doublets in odd nuclei with stable octupole deformations it is proposed to study conversion electrons in odd — mass radium and radon isotopes following the /? — decay of francium and astatine. For conversion electrons it is intended to use the high resolution Si — detector and for gamma rays a high resolution gamma — X detector. References PSCC/83 - 251 KRYPTON ION PUMP LASER HELMHOLZ COILS O°IGe /DETECTOR 209 Rn ISOLDE BEAM Experiment IS110: Nuclear Orientation Studies and Measurements of Magnetic Moments of Radon Isotopes ISOLDE IS110 Beam US1 Approved 15/NOV/1984 Status Data-Taking Nuclear Orientation Studies and Measurements of Magnetic Moments of Radon Isotopes CERN, Kingston Queens Univ., Mainz Univ., Princeton Univ., Zurich E.TJI., Isolde Collaboration CERN Ulm G. Wendt K. Kingston Queens Univ. Ewan G.T. Mainz Univ. Bonn J. Neugan R. Otten E. Princeton Univ. CaJaprice F.P. Clayhold i. Happer W. Kitano M. Musolf M. Zurich E.T.H. Von Dincklage R.D. Orsay C.N.R.S. Duong H.T. Spokesman: Calaprice, F.P. Contactman: Ulm, G. The purpose of this project is to extend the optical pumping spin exchange method of nuclear orientation, currently used for xenon, to radon, and to apply it to measure the nuclear magnetic dipole moments of some radon isotopes. Owing to the long spin relaxation time of the inert gases, the linewidths of NMR transitions in radon should be very narrow, perhaps 0.01 Hz, or narrower. The narrow linewidths provide the sensitivity to make very precise measurements of nuclear magnetic dipole moments. An accurate direct measurement of the magnetic moment of a radon isotope provides a calibration of the moments measured by HFS studies by colinear laser spectroscopy. Measurements of the magnetic moments of the neutron rich radon isotopes are interesting for exploring the possibility of octupole deformations, a topic of particular interest for this region of the table of isotopes. Looking to the future, the proposed experiments would demonstrate whether the narrow linewidth techniques could also be applied to search for the time reversal violating nuclear electric dipole moments. References PSCC/84 - 54/P79 253 - Schematic on-line nuclear orientation experiment "STILL CONTINUOUS HEAT EXCHANGER SILVER SINTERED HEAT EXCHANGER SIDE ACCESS MIXING CHAMBER FACILITY BEAM COLO FINGER 'IRIS APERTURE BEAM-LINE RADIATION SHUTTER 1ST SPLIT PAIR IN CLOSEO POSITION - Side access section and dilution unit of an on-line refrigerator Experiment IS120: Nuclear Implantation into Cold On Line Equipment (NICOLE) ISOLDE IS 120 Beam US1 Approved 07/FEB/1985 Status Preparation Nuclear Implantation into Cold On Line Equipment (NICOLE) Bonn Univ., CERN, Daresbury Lab., Delft Tech. Univ., Gent, State Univ., Louvain Cath. Univ., Lyon Univ., Munich TU, Orsay CSJV.SJM., Oxford Univ., Paris, IN2P3, StrasbourgJCJtJV., Isolde Collaboration Bonn Univ. Freitag G. Herzog P. CERN Niinikoski T. Daresbury Lab. Walker P.M. Deift Tech. Univ. Postma H. Gent, State Univ. Heyde K. Louvain Cath. Univ. Coussement R. Vanneste L. Lyon Univ. Berkes I. Marest G. Sau J. Munich TU Hagn E. Zech E. Orsay C.S.NS.M. Liang G. Paris P. Oxford Univ. Rikovska J.R. Stone N.J. Paris. IN2P3 Richard - Serre C. Strasbourg jC.R.N. Zuker A. Spokesman: Stone, N.J. Contactman: Serre, C. Low temperature nuclear orientation of isotope — separator implanted short —lived radioisotopes makes possible the measurement of nuclear magnetic dipole and electric quadrupole moments of oriented ground and excited states with half— lives longer than a few seconds, and the evaluation of level — schemes and multipole mixing ratios in the decay of daughter nuclei. Coupling schemes characterising the odd nucléons and ground - state deformations can be extracted from the nuclear moments. The high sensitivity of the method enables searches for weakly fed intruder states in daughter nuclei. After implantation of the primary ion beam, nuclear orientation may be applied to the study of the decay product;.; in many cases these are either far from volatile themselves, or form beams of ions inappropriate for laser — spectroscopy. Nuclear orientation is thus complementary to the facilities existing at ISOLDE for nuclear moment measurements. Decay scheme parameters are deduced from anisotropies measured in singles. This aspect is complementary to other techniques of nuclear spectroscopy with unique sensitivity to weak transitions. As a first series of investigations we propose the Pt-^Ir-^Os-^Re-^W decay chain, obtained from the decay of primary Hg —beam. In these nuclei prolate — oblate shape -insitions are predicted which switch between prolate (lighter) and oblate (heavier) isotopes with an equilibrium quadrupole deformation of the order of jS + 0.15. In platinum isotopes this shape - transition is expected at about A 185 mass-number, in Ir and Os it is at the neutron-rich side. For platinum direct quadrupole moment determinations are planned; for Ir and Os the shape transition region cannot be attained with actual ISOLDE-beams, but the unnatural ground state configurations (I^K), observed already in l86Ir and 193Os in off—line nuclear orientation can be explored by simultaneous determination of /i and Q. References PSCC 85 1 P81 ,CHANNEL PLATE measurement of time of flight ,DRIFT TUBE transformation of radial to axial energy PENNING TRAP 2 decel eration and trapping induction of cyclotron frequency wc increase of radial energy pulsed ejection transfer of pulsed IkeV ion beam 777777Z77771 3f7777777777777 PENNING TRAP 1 collection and trapping of ions cooling pulsed ejection MAGNETIC ,60keVion beam from ISOLDE FIELD Principle (right) and experimental set up (left) for high - precision mass measurements. Experiment IS130: High Precision Direct Mass Determination of Unstable Isotopes ISOLDE/TRAP IS 130 Beam US1 Approved 06/JUN/1985 Status Preparation High - Precision Direct Mass Determination of Unstable Isotopes CERN, Mainz Univ., Montreal McGiU Univ., Isolde Collaboration CERN FockerG.J Kluge H.J. Kugler E. UlmG. Maim Univ. Bollen G. Egelhof P. Kalinowski H. Kern F. Schnatz H. Schweikhard L. Stolzenberg H. Montreal McGill Univ. Moore R.B. Spokesman: Kluge, H.—J. Contactman: Kluge, H.—J. The extension of systematic high—precision measurements of the nuclear mass to nuclei far away from the valley of /? stability is demanded for by nuclear physics and astrophysics: the mass or binding energy represent as a fundamental gross property a key input parameter for nuclear matter calculations. It is a sensitive probe for collective and single—particle effects in nuclear structure. In order to measure nuclear masses with a resolution and accuracy of better than 10"6 (i.e. AM < 100 keV for A = 100), the ions delivered by the on—line mass separator ISOLDE are confined in a Penning quadrupole trap. This trap is placed in the very homogeneous and stable magnetic field of a superconducting magnet. Here, the cyclotron frequency and hence the mass are determined. The first on - line experiments with the help of this new technique will concern mass measurements in long chains of alkaline earth isotopes. References PSCC/8S-31/P84 257 LEP STATUS OF THE LEP PROGRAMME AS OF NOVEMBER 1985 259 9'580 Î BEAM PIPE 2 MINI VERTEX 3 LUMINOSITY MONITOR 4 INNER TRACKING CHAMBER 5 CENTRAL DETECTOR (T.P.C.) 6 e-8 CALORIMETER 7 COIL 8 8 HADRON CALORIMETER 9 MUON DETECTOR 10 SUPERCONDUCTING QUADRUPOLE 2m ALEPH DETECTORS Longitudinal cross section 8.A.83 ALEPH Approved 18/NOV/1982 Status Preparation The ALEPH Detector Athens Demokritos, Ban Univ., Beijing H£J*Jnst., CERN, Clermont-Ferrand Univ., Copenhagen Niels Bohr last., Dortmund Univ., Edinburgh Univ., Florida State Univ., Frascati NatXab. (INFN), Glasgow Univ., Heidelberg Univ., Innsbruck Univ., Lancaster Univ., London, Imperial College, Marseille CJ*J*M., Munich MPI, Orsay Linear Ace. Lab. (LAL), Palaiseau EcJ*oly. LJ*JVJI£., PisaUnh.lINFN, Royal Holloway College, Egham, Rutherford Appleton Lab., Saclay CEN DPhPE, Sheffield Univ., Siegen GHS, Trieste Univ., Wisconsin Univ. Athens Demokritos Kokkinias T. Simopoulou B. Zevgolatakos E. Barl Univ. Catanesi M.G. De Palma M. Iaselli G. Maggi G. Natali S. Nuzzo S. RanieriT. Romano F. Ruggieri F. Selvaggi G. Spinelli P. Zito G. Beijing H.E.P.lnst. Chen Y.B. Huang D. Huang Y. Gu S.H. Lin J.F. Wang S.G. Wang T. Wang D.R. Wang X.L. Wu W.M. Xie Y.G. Xu Y.L. Yan W.G. Zhao H.Q. Zhao W.R. Zhang J.Q. CERN Blondel A. Boeckmann P. Budde R. Cundy D.C. Dydak F. Farilla A. Ferro - Luzzi Michèle Geissler K. Gouache J.C. Hagelberg R. James F. Kellner G. Lacourt A. Lazeyras P. Lehraus 1. Marchioro A. May J. McClatchey R. Palazzi P. Para A. Petrucci G. Pizer I. Potter K. Price M.J. Ranjard F. Richter W. Von Rueden W. SchJatter W.D. Sloan T. Steinberger I. Tejessy W. Vayaki A. Verweij H. Wachsmuth H.W. Wahl H. Witzeling W. Wotschack J. Clermont-Ferrand Univ. Bardadin - Otwinowska M. Brossard M. Daudon F. Falvard A. Jousset ?. Michel B. Montret J.C. Querrou M. Vazeille F. Copenhagen Niels Bohr Inst. Bertelsen H. Hansen J.D. Kofoed- Hansen O. Lindahl A. Madsen B. Mollerud R. Nilsson B.S. Petersen G. Dortmund Univ. Hubricht G. Kleinknecht K. Knobloch J. Lorenz E. Mueller E. Pollmann D. Renk B. Richstein J. Edinburgh Univ. Candlin D.J. Muir J. Osborne P. Peach K.J. Pijlgroms B. Florida State Umv. Georgiopoulos C. Levinthal D. Frascati Nat.Lab. (INFN) Baldini R. Beck G.A. Bencivenni G. Bologna G. Campana p. Capon G. Celani F. Ciocio A. D'Ettore Piazzoli B. Dulach B. Felici G. Laurelli P. Mannocchi G.P. Murtas G.P. Nicoletti G. Pallotta M. Picchi P. Glasgow Univ. Conway A. Flavell A.J. Hughes I.S. Ledingham K.W. Lynch J.G. Martin D.J. Negus P.J. O'Neill R. Raine C. Scarr J.M. Smith K.M. Stewart D.T. Thompson A.S. Turnbull R.M. Wells J. Heidelberg Univ. Braun O. Geweniger C. Hanke P. Hepp V. Heyde W. Kluge E.E. Krause J. Plothow - Besch H. Putzer A. Tittel K. Innsbruck Univ. Girtier P. Kuhn D. Rudolph G. Lancaster Univ. Bowdery C. Finch A. Foster F. Hughes G. London, Imperial College Barber G. Beuselinck R. Binnie D.M. Cameron W. Campbell R.J. Dornan P.J. Garbutt D.A. Gentry D. Gibb J.V. Hall G. Jones W.G. McEwen J.G. Miller D.G. Price D.R. Sedgbeer J.K. Toudup L. Websdale D.M. While A. P. References LEPC/82-3/M, LEPC/82-18/M7, LEPC/82- 19/M8, LEPC/82-24/M12, LEPC/82-31/M17, LEPC/82-32/M18, LEPC/82-38/M23, LEPC/83-2/P1, LEPC/83 -9/M40, LEPC/83 - 14/M41. LEPC/84-8/M46, LEPC/84-15/MSO 261 ALEPH Marseille C.P.P.M. Albanese J.P. Aubert J.J. Bazzoli R. Benchouk C. Bonissent A. D'Agostini G. Kajfasz E. Montanet F. Nacasch R. Payre P. Pietrzyk B. Munich MPI Blum W. Brettel H. Dietl H. Fent J. Hoti P. Lutjens G. Lutz G. Maenner W. Richter R. Settles R. Stierlin U. Slimpfl G. Tribanek W. Weissbach P.K. Orsay Linear Ace. Lab. (LAL) Boucrot J. Callot O. Chase R.L. Cohen 1VÎ. Cordier A. Davier M. Decamp D. Dialinas m. Ducorps A. Fournier D. Grivaz J.F. Heusse P. Jean P. Lefrancois J. Lut2 A.M. Raso G. Veillet J.J. Palaiseau Ec.Pofy. L.P.N.H.E. Badier J. Benkheiri P. Bourotte J. Busata A. Chevalier J.M. Fouque G. Jacquet F. Lemoine C. Matricon P. Mine P. Parey J.Y. Rouge A. Rumpf M. Videau H. Videau I.M. Pisa Univ.jINFN Amendolia S.R. Batignani G. Bellettini G. Bortolucci E. Bosi F. Bosisio L. Bottigli U. Braccini P.L. Bradaschia C. Castaldi P.. Dell'Orso M. Fantechi. R. Fidecaro F. Foa L. Focardi E. Galeotti S. Gennaro G. Giazotto A. Giorgi M. Mannelli 1. Marrocchesi P.S. Passuello D. Salvadori P. Sanguirtetti G. Tonelli G. Triggioni G. Vannini C. Royal Holloway College, F.gham Bellamy E.H. Green M.G. Landon M. March P.V. MedcalfT. Strong J.R. Rutherford Appleton Lab. BotterilJ D. Cawthraw M. Corbett I. ClifTt R. Edwards M. Fisher S.M. Harvey J. Holtom E. McPherson G. Morissey M. Norton P. Taleb2adeh M. Tappern G. Thompson J.C. Tucker A. WWuaker B.J. Saclay CEN DPhPE Be M.M. Bloch B. Brisson J.C. Desportes H. Gosset L. Jacquemet M Joudon A. Le Bars J. I^esmond C. Merlo J.P. Micolon P. Mur M. Palanque S. Pascual J. Paul B. Perez P. Perrier F. Peyaud B. Rander J. Renardy J.F. Schuller J.P. Tarie G. Turlay R. Vallage B. Sheffield Univ. Combley F. Danaher S. Wells C. Siegen GlIS Baecker A. Brandt S. Grupen C. Holder M. Meyer H.J. Rost M. Stupperich K.H. Zech G. Trieste Univ. Budiruch M. Liello F. Milotii E. Ragusa F. Rolandi L. Stefanini A. Wisconsin Univ. Binder M. CaldweU A Cherney M. Guo Y. Hildebrandt M. Izen J. Jared R. Kim N. Mermikides M. Mueller D. Sinnis C. Takashima M. Trost H.J. Wicklund E. Wu S.L. Zobernig G. Spokesman: Steinberger, J. Contactman: Steinberger, J. ALEPH is a 4w detector designed to give as much detailed information as possible about complex events expected to be produced in high energy e + e" collisions. A superconducting coil 5 m in diameter and 6 m long produces a uniform 1.5Tesla field in the beam direction. The particle detection is accomplished in layers, onion fashion, each layer with particular function. Inside the coil, in order of increasing radius, there are the following layers: 1. A microstrip solid state device to localize the vertices of short — lived particles. 2. A central track detector using drift wires, with good space resolution and track separation. This element is also an essential part of the trigger system. 3. A TPC (time projection chamber) 3.6 m diameter, 4.4 m long foi the precise measurement of particle momenta and directions, as well as their ionization, dE/dx, to help in particle identification. 4. An c — y calorimeter, of 2 mm lead sheets with proportional wire sampling. The deposited energy is read out in a projective geometry of 80,000 square towers each subtending 1.5 x 10"4 sterad solid angle. The shower energy measurement is divided into three depth zones as an aid in electron identification. Outside of the coil there are two layers: A) The 1.2 m Fe return path is used as hadron calorimeter. It is divided into 5 cm layers with streamer tubes sandwiched between. Pulse heights are read out in about 1000 towers and the 10s tubes are read out individually, yes or no to aid in muon identification. B) A double layer of drift tubes, to aid in muon identification. The strong points of the detector are the precision of charged momentum measurement, consequent to the high magnetic field and the TPC, the good electron and muon identification, even if these are immersed in jets, and the spatial resolution obtained in the e — y calorimetry. 1 i ii il 1 1 i i 1 1- i i •M* | ! 1 , j lij TITF1 ITT Ti ll II IIII II " II \ii •hi ci. CD OPAL Approved 18/NOV/1982 Status Preparation OPAL Collaboration LEP Birmingham Univ., Bologna Univ., Bonn Univ., Cambridge Univ., Carleton Univ., CERN, Chicago Unh., Freiburg Univ., Heidelberg Univ., IsraelInst.Teck., London, Birkbeck College, London, Queen Mary College, London, University College, Manchester Univ., Maryland Univ., Ottawa NatJies.Council, Rehovoth Weizmann last., Rutherford Appleton Lab., Saclay CEN DPhPE, Tel—Aviv Univ., Tokyo Univ. Birmingham Univ. Corden M.J. Dowell J.D. Garvey J. Homer R.J. Me Mahon T. O'Neale S.W. Watkins P. Wilson J. Bologna Univ. Campanini R. Capiluppi P. Fabbri F. GiacomeUi G. Masetti M. Rimondi F. Rossi A.M. Bonn Univ. Bockmann K. Fischer H.M. Hagerath A. Hillen W. Knop G. Kokott T.P.K. Nellen B. von der Schmitt H. Cambridge Univ. Ansorge R.E. Carter JR. Elcombe P.A. Goodrick M.J. Munday D.J. Neale W.W. Ward C.P. Ward D.R. Carleton Univ. Armitage J.C. Carnegie R.K. Dumont J.J. Estabrooks P.E. Hemingway R.J. McPherson A. Pinfold J. CERN Friedrich A.D. Harnew N. Leutz H. Mazzone L. Michelini A. Passardi G. Runolfsson O. Sergo V. Smith A.M. Wenninger H. Chicago Univ. Anderson K.J. Conway J. Oreglia M.J. Pilcher J.E. Freiburg Univ. Bamberger A. Ludwig J. Mohr W. Moser K. Rith K. Rohner F. Runge K. Schaile O. Stier H.E. Weltin A. Heidelberg Univ. Bock P. Heuer R.D. Heintze J. Igo - Kemenes P. v. Krogh J. Lennert P Rieseberg H. Schmidt B. Siebert H.W. von Walter P. Wagner A. Israel Inst.Tech. Dado S. Goldberg J. London, Birkbeck College Coupland M. London, Queen Mary College Carter A.A. Eisenhandler E. Gibson W.R. Kalmus P.I.P. Kyberd P. Thompson G. London, University College Bullock F.W. Duff B.G. Esten M.J. Heymann F.F. Imrie D.C. Miller D.J. Manchester Univ. Allison J. Barlow R.J. Duerdoth I.P. Loebinger F.K. Murphy P.G. Stephens K. Maryland Univ. Chang C.Y. Glasser R.G. Kellogg R. Rapp P. Sechi-ZornB. Skard J.A. Skuja A. Snow G.A. Steinberg P.H. Zorn G.T. Ottawa Nat.Res.Council Dixit M.S. Hanna D.S. Hargrove C.K. Losty M.J. Mes H. Rehovoth WeUmann Inst. Breskin A. Karshon U. Mikenberg G. Revel D. Shapira A. Yaari R. Yekutielli G. Rutherford Appleton Lab. Brown R.M. Rousseau M.D. Yanagisawa C. Saclay CEN DPhPE Gandois B. Gentit F.X. Le Du P. Lesquoy B. Mallet J. Moscoso L. Muller A. Rougevin P. Zylberajch S. Tel-Aviv Univ. Alexander G. Bella G. Gnat Y. Grunhaus J. Ijevy A. Tokyo Univ. Imori M. Kanzaki J. Kawamoto T. Kobayashi T. Koshiba M. Minowa M. Nozaki M. Orito S. Sato A. TakedaH. TakeshitaT. Totsuka Y. YamadaS. References LEPC/82-4/I2. LEPC/82-15/M4, LEPC/82-16/MS, LEPC/82 - ]7/M6, LEPC/82-33/M6/Add.l, L.EPC/82-25/M13. LEPC/82-28/M13/Add.l, LEPC/82-29/M16, LEPC/82-34/M19, LEPC/82-46/M28, LEPC/82-47/M29. LEPC/82 - S7/M34, LEPC/82 - 66/M37, LEPC/83-4/P3, LEPC/82-61/M35, LEPC/84 - 4/M44, LEPC/84-17/M51 265 ••• -J \ \ ••\ ••• y ••( 1 i \ i i ' ' \ \ ' ] • • » V \ \ ft ' '> \ ', _ , i 1 • \ '•• \, \ :-\ \ , >-•• • .. \ - •\ OPAL Spokesman: Michelini, A. Opal is a detector designed for LEP. It is of the general purpose type because of the wide range of unexplored physics to be studied at the new e+e~ machine. In the energy range accessible at LEP, the mechanisms by which symmetries are broken at present energies should manifest themselves. Among the central physics issues will be the study of the Z° and W±, the determination of their exact masses and widths, and couplings to leptons and quarks. A general search for new quark flavours, for heavy leptons and for Higgs bosons will be made. These studies as well as searches for more unexpected phenomena such as free quarks and technicolour require a general purpose detector with good energy resolution and particle identification capable of studying complicated events. The main components of the proposed detector are the following (fig. la, b): a) A central detector of the jet chamber type, as in JADE, for efficient tracking of multiparticle events and accurate measurement of particle momenta and dE/dx. b) A solenoid providing a uniform magnetic field of 4 kG, for the initial operation. c) An electromagnetic calorimeter mounted around the solenoid and covering the full solid angle, consisting of an array of lead glass elements for detection of electrons and photons. d) A hadron calorimeter of the iron — scintillator sandwich type for measuring hadronic energy. The iron of the calorimeter will serve as a return yoke for the magnet. e) A system of drift chambers for detection and identification of muons over the full solid angle. f) A forward detector including a luminosity monitor and an e.m. calorimeter system for the study of a 2 y processes. 267 L 3 MACHINE CENTER HADRON CALORIMETER ELECTROMAGNETIC SHOWER COUNTERS (BGO) TIME EXPANSION CHAMBER L3 Approved 18/NOV/1982 Status Preparation L3 Experiment Aachen TH, I PhysJnst., Aachen TH, III PhysJnst., Amsterdam NIKHEF, Annecy LAJ'J*., Beijing H£J*Jnst., Bombay, Tata Inst., Budapest Res. Inst., Caltech, Carnegie—Mellon Univ., CERN, EIR Wuerenlingen, Florence Univ., Frascati NatXab. (INFN), Geneva Univ., Harvard Univ., Hawaii Univ., Hofei Science and Tech. Univ., John Hopkins Univ., Lausanne Univ., Lund Univ., Lyon Univ., Madrid J£JS., Michigan Univ., MJ.T., Moscow I.T£Jt., Naples Untv.flNFN, Northeastern Univ., Ohio State Univ., Oklahoma Univ., Princeton Univ., Rome Univ., Siegen GHS, Yale Univ., Zeuthen InstJUEnJ*hys., Zurich E.TH. Aachen TH, I PhysJnst. Braun D. Degen Y. Genzel H. Haeck T. Kaprinski W. Kukulies C. Lurken F. Martyn U. Micke U. Niessen L. Pandoulas D. Peise G. PonomarefT T. Sander H.G. Schild G. Schmitz D. Schultz von Dratzig A. Siedling R. Sudhakar K. WallraJT W. Zhou J.F. Aachen TH, III Phys.Inst. Bohm A. Camps C. Commichau V. Deutschmann M. Fesefeldt H. Fritze P. Graessler H. Hangarter K. Hawelka P. Krenz W. Linnhoefer D. Schulte R. Schultze K. Struczinski W. Tonutti M. Wu S.X. Amsterdam NIKHEF Blokzijl R. Buis R. Buskens J. De Groot H. De Koning N. De Vries G. Duinker P. Dykema J.A. Erne F. Faber G. Gobink W. Gosman D. Groenstege H. Harting D. Homma J Hooghoudt B. Hunck P. Klok P.F. Kok H. Konijn G. Kroezen M. Massaro G.G.G. Pohm P. Pols C. Pong Yue Postma H. Raaymakers M. Rewiersma P. Schotanus D.J. Schuylenburg H. Sens H. Van der Graaf H. Van der Walle R. Van Driel M.A. Wassenaar E. Wynen T. Annecy L.A.P.P. Bazan A. Bermond M. Bertsch Y. BottolJier J.F. Caillât M. Camberlin B. Chauveau J. Coignet G. De Bouard X. Degre A. Denis J.P. Girard C. Guillon C. JuSheng-Lu Lacotte J.C. Lebeau M. Lecoq J. Le Marec J.C. Maire M. Massonnet L. Morand R. Mugnier P. Oribini A. Pellier A. Perret - Gallix D. Petitpas P. Schneegans M. Toth J. Vey H. Vivargent M. Beijing H.E.P.Inst. ChenC. ChenHo-Sen ChenMei-Li Fong G.Y. Gu Y.F. He J.T. Jin B.N. Lu Y.S. Tang Hsiao -Wei TungK.L. WangJ.H. Wu Y. J. Yang K.S. Zhang Chang- Chen Zhang S.Y. Bombay, Tata Inst. Banerjee S. Chendvankar S.S. Ganguli S.N. Gurtu A. Mahalingam R. Malhotra P. Raghavan R. Sudhakar K. Ton war S. Budapest Res. Inst. Eszes G. Jancso G. Nagy E. Ribarics P. Urban L. Caltech Gomez R. Hanson J. Kwok T.L. LaUy S. Lawrence T. Ma H. Mount R. Newmann H. Pal T. Pedram M. Stone H. Carnegie— Mellon Univ. Zhou T.Q. Caltech Zhu R.Y. Carnegie - Mellon Univ. Bobbink G. Engler A. Kraemer R. Rippich C. Smith J. Sutton R.B. Vogel H. CERN Anders H. Becker U. Bruyant F. Feldmann M. Freudenreich K. Gusewell D. Harris M. He J.T. Herten G. Hervé A. Lecoq P. Leistam L. Lu Y.S. Lubelsmeyer K. Montanet L. Reucroft S. Tung K.L. Wittgenstein F. ZoUJ. EïR Wuerenltngen Boehlen W. KoUer M. Kuhn A. Waespe R. References LEPC/82 - S/I 3. LEPC/82-45/I3/Add.l, LEPC/82-60/I3/Add.2, LEPC/82-26/M14, LEPC/S2 -42/M27, LEPC/83 - 5/P4, LEPC/84-4/PR3, LEPC/84-6/PR4, LEPC/84-7/M4S, LEPC/84-21/M54, LEPC/85- I7/M63 269 L3 Florence Univ. Bocciolini M. Cartacci A.M. Celletti F. Ciancagliiii G. Conforti G. Conforto G. Conli A. Landi G. Marchionni A. Monteleoni B. Parrini G. Pelfer P.G. Ricci C. Frascatl Nat.Lab. (INFN) Spillantini P. Geneva Univ. Alcoreza H. Bene P. Bergamaschi S. Bourquin M. Christinet A. Extermann P. Hausammann R. La Marra D. Masciocchi F. Mermod A. Nusbaumer M. Ossmann J. Perrin E. Produit N. Richeux J.P. Ruckstuhl W. Tentindo S. Zofka M. Harvard Univ. Antreasyan D. Irion J. McBride P. Strauch K. Williams D. Hawaii Univ. Cence R. Hofei Science and Tech. Univ. BianHe-Qian Chen Hong-Fang Chou Zhong - Ping Fan Yang — Mei Gong Cu-Fang HanYong-Dian Li Cheng LinZi-Yong Wang X.L. Wang Zhong - M in XuZi-Zong Yang Bao - Zhong YuTie-Jian John Hopkins Univ. Biumenfeld B. Chien C.Y. Pevsner A. Spangler J. Lausanne Univ. BoehringerT. Dorc C. Gailloud M. Lebroussard J. N'oyard J.P. Rochat M. Rosselet P. Roth C. Weiil R. Lund Univ. Von Dardel G. Lyon Univ. Burq J.P. Chemarin M. Chevallier M. El Mamouni H. Fay J. Goyot M. Ille B. Lambert M. Lebrun P. Madjar N. Martin J.P. Veyron B. Madrid J.EM. Adeva A. Aguilar - Benitez M. Albajar M.C. Alvarez - Taviel J. Berdugo J. Cerrada M. Duran I. Gonzalez E. LegofTJ.M. Mana C. Marquina M.A. Martinez L. Olmos P. Rodriguez S. Rubio J.A. Salicio Jose Willmott C. Michigan Univ. AzemoonT. Ball R.C. Jones L.W. Leedom I.D. Pluta J. Roe B.P. Schick H. M.I.T. larges P. Bowditch P. Branson J. Burger J. Capell M. Chen H.S. Chen Min Dhina M. Donahue J. Eppling F. Fong L>. Fukushima M. Henestroza E. HofTman R. Luckey D. Marks S. Marsden P. Milbocker M. NingRen-Da Osborne D. Park S. Rykaczewski H. Sphikas P. Swider G. Tarrh J. Ting S.C.C. Toth W. WenausT. White M. Wyslouch B. Xi Fu Yun Zhang Zi Ping Zhou B. Moscow l.T.E.P. Arefiev A. Bocharov V. Fedorov O. Galaktionov Yu. Gordeev A. Gordeev B. Gorodkov Yu. Kamyshkov Yu. Kosov M. Koutsenko V. Kunin A. Lulevich V. Luzgetski Morgunov V. Nikiiin A. Plyaskin V. Pojidaev V. Shevchenko V. Shumilov E. Tarkovsky E. Tchudakov V. Vetlitski I. Vorobyev I. Naples UnivJINFN Carbonara F. Chiefari G. Drago E. Lanzano S. Merola L. Napolitano M. Paternoster G. Patricelli S. Sciacca C. Visco F. Northeastern Univ. Alverson G. Faissler W. Garelick D. Gettner M. Glaubman M. Polvado R. Shambroom D. Ohio Stale Univ. Dunlea J. Gothier E. Kalen J. Oleynik G. Reay N. Reibel K. Sidwell R. Stanton K. Oklahoma Univ. Kalbfleisch G. Princeton Univ. Bakken J.A. Blino C. Bopp C. Denes P. Grazer G. Isaila M. Piroue P. Rabberman R. Smith A.J.S. Stickland D. Sumner R. Rome Univ. Bagnaia P. Barone L. Bellomi G. Bizzarri R. Borgia B. Cesaroni F. De Notaristefani F. Diemoz M. Dionisi C. Falciano S. Ferroni F. Gentile S. Gratta G. Longo E. Loverre P.F. Luminari L. Lunadei G, Mar2ano F. Monacelli P. Petrolo E. Tusi A. Valente E. Siegen GHS Biermann U. Mattern D. Roderburg E. Walenta H. Yale Univ. ZeUer M. Zeuthen inst.H.En.Phys. Deiters K. Klein M. Leiste R. Nowak W.D. Schreiber J. Vogt H. Zurich E.T.H. Anderhub H. Fehlmann J. Hofer H. Jongmanns M.G. Lccomte P. Le Coultre P. Li L. Lue X. Pohl M. Ren D. Seiler P.G. Suter H. Telegdi V.L. Ulbricht J. Viertel G. Spokesman: Ting, S.C.C. Contactman: Hofer, H. 271 L3 The detector consists of a large volume low field solenoid magnet, a small central tracking chamber with very high spatial resolution, a high resolution electromagnetic calorimeter encapsulating the central detector, a hadron calorimeter acting also as a muon filter, and high precision muon tracking chambers. The detector is designed to measure energy and position of leptons with the highest obtainable precision allowing a mass resolution Am/m smaller than 2% in dilepton final states. Hadronic energy flux will be detected by a fine — grained calorimeter, which also serves as muon filter and tracking device. The outer boundary of the detector is given by the iron return — yoke of a conventional magnet, using aluminium plates for the coil. The field is 0.5 T over a length of 12 m. This large volume allows a high precision muon momentum measurement, performed by three sets of drift chambers with multiple measurement of the co-ordinate in the bend plane. Go:ng radially inwards, the combined hadron calorimeter and muon absorber consists of wire chambers operating in the proportional mode, sandwiched with Cu or U—plates as energy converter. A subdivision into 3000 space elements covering the full solid angle (except the beam pipe) allow localization and determination of the hadronic energy flow with around 45% energy resolution. The electromagnetic energy flow will be determined by approximately 10000 crystals of BGO (Bi4Ge30i2), a transparent scintillator with 1.1 cm radiation length. Full electromagnetic shower containment near 4n- solid angle coverage is foreseen. An energy resolution smaller than 1.2% and a spatial resolution better than 2 mm will be obtained for gamma energies larger than 1 GeV with a rejection against hadrons of better than 1000. Surrounding the beam pipe a high precision drift chamber operating in the time expansion mode acts as a charged particle vertex detector. One can expect a resolution down to a = 30 /i. Specifically this chamber allows an electron/photon separation and a high precision on the muon vertex, as well as a direct measurement of the lifetime of long—lived particles. The richness of the physics rests on the outstanding features of the L3 detector, i.e. high precision inclusive lepton and photon spectra, precise dilepton final states, multilepton final states and their combination with hadronic jets. 273 barrel Muon Chambers Bjrr?i Hadron Calorimeter ScintiUators Superconducting Coil End Cap Muon Chambers End Cap Hadron Calorimeter barrel e m Calorimeter Forward e m Calorimeter Outer Detector Forward Chambers B Barrel RICH Forward RICH TPC Forward Chambers A Inner Detector Vertex Detector Small Angle Tagger DELPHI 347 H . DELPHI Approved 18/NOV/1982 Status Preparation DELPHI Ames Lab., Amsterdam NIKHEF, Athens Univ., Athens Nat. Tech. Univ., Belgium (DELPHI), Bergen Univ., Bologna INFN, CERN, Copenhagen Niels Bohr last., Cracow InstJVuclJ*hys., Dubna 7JJVJ?., Genova Unh./INFN, Helsinki Univ., Karlsruhe KfK, Liverpool Univ., Lund Univ., Milan Unh./INFN, Orsay Linear Ace. Lab. (LAL), Oslo Univ., Oxford Univ., Padova Univ., Paris College de France, Paris, LPNHE, P.et M.Curie Univ., Rome, SanitallNFN, Rutherford Appleton Lab., Saclay CEN DPhPE, Santander Univ., Serpukhov IHJLJ*., Stockholm Univ., Strasbourg Univ., Torino Univ.lINFN, Trieste Univ., Uppsala Univ., Valencia Univ., Vienna Akad. Wissensch., Warsaw InstJVuclJles., Wuppertal Univ. Ames Lab. Crawley H.B. Firestone A. Hauptman J.M. Lamsa J.W. Meyer W.T. Rosenberg E.I. Amsterdam NIKHEF Diddens A.N. Jansen H. Koene B. de Miranda R. Timmermans J. Toet D. Udo F. Van Dam P. Athens Univ. Anassontzis E. Ioannou P. Kalkanis G. Katsanevas S. Kourkoumelj? C. Koutentakis J. Markou A. Martakos D. Resvanis L.K. Vassiliou M. Voulgaris G. Athens Nat. Tech. Univ. Filippas T. Fokitis E. Gazis E. Giomataris I. Katsoufis E.C. Maltezos A. Maltezos S. Papadopoulou T. Vlassopoulos S.D.P. Belgium (DELPHI) Bertrand D. Daubie E. De Clerq C. Gaudaen J. Grard F. Herquet P. Kesteman J. Lemonne J. Poiret C. SactonJ. TavernierS. Van Der Velde-Wilquet C. Van Doninck W. Verbeure F. Wickens J.H. Bergen Univ. Frodesen A.G. lversen P.S. Klovning A. Lillestol E. Lillethun E. Olsen J.M. Ursin J.R. Bologna INFN Argento A. BolUni D. Bruni C. Camporesi T. Cavallo F.R. Giusti P. Heiman G. Navarria F. Valenti G. CERN Allaby J.V. Amaldi U. Anzivino G. Bâillon P. Barranco- Luque M. Bell W. Brand C. Brown R.C.A. Burmeister H. Cairanti S. Carena F. Cattai A. Cirio R. Fischer H.G. Foeth H. Fraissard D. Frandsen P. French B.R. Fries D. Gavillet P. Goldschmidt-Clermont Y. Grant A. Grillet J.P. Gygi E. Heck B. Hilke H.J. Horisberger R. Hyams B.D. Kantardjian G. Klein H. Klempt W. Kornelis Y. Kuhn G. Lanceri L. Lecoeur G. Legrand J.C. Marin J.C. Metcalf M. Mornacchi G. Muller Hans Pape L. Pattison J.B. Perez J. Petrucci G. Quercigh E. Queru P. Rossi L. Rosso E. Saldana F. Schneider F. Treille D. UUaland O. Weilhammer P. Wetherell A.M. Copenhagen Niels Bohr Inst. Boggild H. Botner O. Dahl- Jensen E. Dshl-Jensen I. Damgaard G. Hansen K. Hooper J. M oiler R. Cracow lnst.Nucl.Phys. Dulinski W. Hajduck Z. Muryn B. Polok G. Rybicki K. Turala M. ZzJewska A. Dubna J.I.N.R. Alekseev G.D. Bogolubov P.N. Golovatyuk V.M. Denisov Yu.N. Kadyrov R.B. «Cruglov V.V. Mitselmakher G,V. Rydky J. Sissakian A.N. Tkachov L.G. Tsyganov E.N. Tyapkin A.A. Tyapkin I.A. Vodopianov A.S. Vrba V. Genova Unlv./INFN Barbiellini G. Bozzo M. Caso C. Contri R. Darbo G. Ferroni S. Fontanelli F. Gracco V. Maori M. Sannino M. Squarcia S. Trevisan U. Helsinki Univ. Aarnio P. EUila M. Lauhakangas R. Laurikainen P. Orava R. Saarikko H. Voutilainen M. Karlsruhe KfK Engler J. Flugge G. Hopp G. Keim H. Muller Heinz Panter M. References LEPC/82-8/16. LEPC/82-58/I6/Add.l, LEPC/82 - S9/I6/Add.2, LEPC/82-23/MM, LEPC/82 - 37/M22, LEPC/82-49/M31, LEPC/82 - 50/M32, LEPC/83-3/P2, SPSC/84-50/M379, LEPC/84-3/PR2, LEPC/84-ll/PR2/Add.l, LEPC/84- 16/PR6, LEPC/84-18/MS2, LEPC/85-7/PR7, LBPC/85-10/PR6/Add.l. LEPC/85-4/M56, LEPC/85-11/PR6/Add.2. LEPC/85- 12/PR6/Add.3, LEPC/8S-2I/PR6/Add.4, LEPC/85-22/PR6/Add.S 275 DELPHI Liverpool Univ. Biagi S. Booth P.S.L. Carroll L.J. Edwards D.N. Houlden M.A. Jackson J.N. Range W.H. Lund Univ. AJmehed S. Gustafsson G. Jarlskog G. Johansson S. Jonsson L. Lorstad B. Milan Univ.\iNFN Calvi M. Matteuzzi C. Meroni C. Negri P. Pullia A. Ragazzi S. Rollier M. Tamborini M. Vegni G. Orsay Linear Ace. Lab. (LAL) Augustin J.E. Bouquet B. Cosme G. Couchot F. D'Almagne B. Ferrer A. Fulda F. Haissinski J. JeanMarie B. Petroff P. Richard F. Roudeau P. Wormser G. Oslo Univ. Bugge L. Buran T. Kirsebom K. Skaali B. Skjevling G. Oxford Univ. LokenJ.G. Lyons L. MyattG. Powell K.J. Radojicic D. RatofTP. Renton P.B. Segar A.M. Williams W.S.C. Padova Univ. Checchia P. Cresti M. De Angelis A. Gasparini F. Mazzucato M. Nigro M. Sartori P. Ventura L. Zumerle G. Paris College de France Besch H.J. Billoir P. Brunet J.M. Crozon M. Delikaris D. Delpierre P. Frenkiel P. Lutz P. Maillard J. Seguinot J. Tocqueville J. Tristram G. Ypsilantis T. Paris, LPNHE, P.et M.Curie Univ. Baubillier M. Boratav M. Grossetete B. De La Vaissiere C. Zitoun R. Rome, SanitalINFN Baroncelli A. Bosio C. Matthiae G. Sacco D. Santoni C. Stanescu C. Tortora L. Rutherford Appleton Lab. Barlow J. Franek B. Gopal G. Guy J.G. Kalmus G. Sekulin R. Tyndel M. Venus W. Saclay CEN DPhPE Barate R. Bolognese T. Borgeaud P. Charpentier P. Marel G. Sacquin Y. Siegrist P. Smadja G. Turleur M.L. Villanova D. Virchaux M. Santander Univ) Cuevas J. Lopez M.A. Ruiz A. Villar E. Serpukhov I.H.E.P. Borovikov A.A. Bryzgalov V.V. Chlyapnikov P.V. Dzhelyadin R.I. Fenyuk A.B. Gerdyukov L.N. Gumenyuk S.A. Lapin V.V. Petrovykh Yu.L. Tyurin N.B. Vlasov E.V. Vorobiev A.P. Zajtsev A.M. Stockholm Univ. Berggren M. Carlson P. Ekspong G. Gennow H. Holmgren S.O. Hulth P.O. Hultqvist K. Johansson E. Walck Ch. Yamdagni N. Srasbourg Univ. Amrane N. Arnold R. Bloch D. Croissiaux M. Engel J.P. Etienne F. Gerber J.P. Guyonnet J.L. Schaeffer M. Stri:b R. Torino Univ./MFN Bianchi F. Cester R. Gamba D. Marchetto F. Menichetti E. Peroni C. Riccati L. Rinaudo G. Romero A. Trieste Univ. Castelli E. Poropat P. Sessa M. Tronçon - Ragusa C. Zangrando D. Uppsala Univ. Eek L.O. EkelofT. Fransson K. Hallgren A. Kullander S. Lund - Jensen B. Valencia Univ. Boita J.M. Castillo M.V. Ferrer A. Higon E. Sanchis M.A. Velasco J. Vienna Akad. Wissensch. Adam W. Bartl W. Hrubec J. LederG. Mandl F. MitarofFW. Neuhofer G. Pernicka M. Régler M. Wutte C. Warsaw Inst.Nucl.Res. Doroba K. Gokieli R. Gorski M. Krolikowski J. Sosnowski R. Szeptycka M. Szczekowski M. Wuppertal Univ. Becks K.H. Drees J. Forsbach H. Glitza K.W. Lenzen G. Lorenz P. Schmidt D. Wahlen H. Spokesman: Amaldi, U. DELPHI is a general purpose detector for physics at LEP on and above the Z°, offering three - dimensional information on curvature and energy deposition with fine spatial granularity as well as identification of leptons and hadrons over most of the solid angle. A superconducting coil provides a 1.2 T solonoidal field of high uniformity. Tracking relies on the inner detector, the Time Projection Chamber (TPC), the outer detector and forward drift chambers. Electromagnetic showers are measured in the barrel with high granularity by the High Density Projection Chamber (HPC) and in the endcaps by 1° x 1° projective towers composed of lead glass as active material and photodiode read-out. Hadron identification is provided mainly by liquid and gas Ring Imaging Counters (RICH). The segmented magnet yoke serves for hadron calorimetry and as filter for muons, which are identified in two drift chamber layers. In addition, a scintillator TO F system and a Small Angle Tagger (SAT) are foreseen and a micro vertex silicon detector is b:ing developped. 2 77 LIST OF ALL EXPERIMENTS APPROVED SINCE 1975 EXP. STATUS EXP. TITLE INSTITUTES SPOKESMAN mm CoapI«tad High anargy nautrfno CERN 6-tt 1 nba r 9a r . J. I n-taractl ont Dortaund Univ. Hal dalbarg Uni v. Sac I ay CEN DPhPE Warsaw In*t.NucI . Ras . CoapIatad Ltptonlc dacays of hyparons Brl stol Uni v. Cal I lard. J. M. Ganava Un Iv. Haldalberg Uni v. Orsay Linear Ace. Lab. CLAL3 Rutherford Applaton Lab. Strasbourg Univ. Coapleted Exclusive PI p and K p Aasterdaa NIKHEF Wai I heaaer. P. I n-teractl ons CERN Cricov Jag. Uni v. Munich MPI Oxford Uni v. Rutherford Appleton Lab. CoapIatad Photoproduction of hadrons Bonn Univ. Richard. F. CERN Palalsaau Ec.Poly. L- P. N. H. E. G 1 asgow Un I v. Lancaster Uni v. Manchester Univ. Orsay Linear Ace. Lab. CLflLJ Par I s VI Uni v. Rutherford Appleton Lab. She**laid Univ. WA5 Wlthdravn Backward two-body reactions IndI ana Un f v. Borgeaud/ P. Saclay CEN DPhPE WA6 Coapleted Polarization In p p and PI p CERN FI decar o. C. elastic scattering Padova Univ. Tri este Uni v. Vienna Akad. Vlssensch. WA7 CoapIeted Two-body reactions at large pt Annecy L. A. P. P. Gr a c c o. V. CERN Copenhagen Niels Bohr Inst. Cenova Uni v. /INFKI London. University Collage OsIo Univ WAS Wlthdr sre aes on BlrsiJnghem Uni v. Dowe II. J. D. states In K* K- p col I I s)on s WA9 Coapleted High precision study of Clermont-Ferrand Univ. Ekelof, T. elastic scattering in the Leningrad Inst. couloab Interference region Lyon Univ. Uppsa la Univ. WAI 0 CoapIeted Study of «•- p'Ki PI*- and Geneva Univ. Mart I n. M. reactions of IIMI tar -topology La u s anr>9 Uni with high statIttIci WA11 Completed Search for high Mass states London. Imperial Cotlege David. M. produced with pilC3.1) Indiana Univ. Saclay CEN DPhPE WA12 Coapleted Bean cluap I n OMEGA Bl rm I ngham Univ. Dowe II. JO. CERN Palalseau Ec.Poly. L.P.N.H.E. Munich MPI Nauchata I Unl v. WA13 Coup Ieted Antl-p p • antllambdaO laabdaO CERN Sonderegger. P. at large pt In OMEGA Neuchate I Unl v. Paris College de France WAlt CompIetec Bar I Unl v. Pu I I I a. A. experiment with fjargameMe CERN Palalseau Ec.Poly. L. P. N. H. E. Milan Un I v. /INFN Orsay Linear Ace. CLAL3 VAIS Wlthdrawn Wide-band beam antineutrlno Aachen TH Mor f In, J. expt In Gargamelle to study Bergen Univ. purely leptonlc and other Brussels. IIHE rare antineutrlno interactions London. University College Strasbourg Univ. WAIB Completed Exploratory expt at very high CERN Aubert, B. Orsay Linear Ace. Lab. CLAD band beam with Gargamelle Palalseau Ec.Poly. L. P. N. H. E. Strasbourg Univ. WA17 Completed Search for new short-lived Ankara Tech. Univ. Convers I , M. partlclei produced In neutrino Brussels. IIHE Interactions In en emulsion CERN stack coupled to BEBC Dublin Univ. College London. Univernlty College MlIton-Keynes Open Univ. Pisa Univ. /IHFM Rout Univ. Torino Univ. 2 79 EXP. STATUE EXP.TITLE INSTITUTES SPOKESMAN WA1B Coapleted Study of caul lap-ton le and CERN Winter. K. leptonlc nmu-trm I - current Haaburg Uni v. prtiiiKi and of «•«tarda» NIKHEF au-polirIzat I on using Roae Uni v. /INFN coun-tar techniques Moscow I. T. E. P. WA19 Coapleted Study of high anarsy nautrlno mchin TH Cundy 0 C. Interactions uilnf BEBC filled Bonn Univ. with a H2-Ne Mixture CERN Oxford Uni WA20 Coaplatad Baaa duap tait In BEBC with Aachan TH Myatt. C. MOB Bonn Uni v. CERN London» latarlal College Oxford Uni v. Sac I ay CEN DPhPE %»A21 Coaplatad High energy nautrlno and . Blralnghaa Univ. Myatt. C. antlnautrlno Intaractlona In Bonn Univ. BEBC * I I lad with H2 CERN London, laatrlal Collaga London. Uni varsity Collaga Muni eh MPI Oxford Uni v. WA22 Withdrawn Exparlaant In BEBC to cospare London. laparlal Collaga Buttarworth. I navtral and chargad current Saclay CEN OPhPE nawtrlno Interactions Inducad by Mv PI and Mv K at tha >••• anargv WA23 Withdrawn Study of nautral cvrrmn* CERN HeusseT'ph Intaractlon* using Cargaaalla Milan Univ. /INFN axpocad to tha dlehroaatte Orsay Linaar Ace. Lab. (LAL3 baaa N3 w»2t Coaplatad High energy nautrlno and Bari Univ. Vanus. W. antl nautrlno Intaractlons Blralnghaa Univ. using a hydrogan TST in BEBC Brussals. IIHE and a wlda-band bcaa London. Uni varsity Collaga Palalsaau Ec.Poly. L. P. N. H. E. Rutherford Applaton Lab. Saclay CEN DPhPE WA2S Coaplatad Nautrlno and antlnautrlno Aastardaa NIKHEF Tannar. A Intaractlons In dautarlua Bargan Univ. Bo I ogna Un I v. Padova Un t v. PI sa Univ. /INFN Saclay CEN DPhPE Torino Univ. WA26 Coaplvted K- p Interaction» In BEBC Clasgow Univ. Bar IoutaudT'R at 70 GaV/c Paris VI Univ. IOUT.UO. K. Rutharford Applaton Lab. Saclay CEN DPhPE WA27 Coaplatad K* p Intaractlons In 8EBC Brussels. IIHE Van da WallâJ RT at 70 CaV/c CERN * ' Canova Univ./INFN Mons Uni v. NIJaagan Cath. Univ. Sarpvkhov Z. H. E. P. WA2B Coaplatad K- p Intaractlons In BEBC Aachan TH Hmna~]~,~F~ at 110 CaV/c CEKN Cracow Jag. Univ. London. laparlal Collage Vlanna, Inst. H. Eh. Phys. CHEPHV3 Warsaw Uni v. WA29 Coaplatad Antiproton annihilation at Llvarpool Univ. Fry. J.R. 20 GaV/c using tha OMEGA s pa ct r oaatar WA30 Coaplatad Dlract alactron production Bologna Univ. Kalaus. G.E. Inducad by 70 GaV/e PI- Glasgow Univ. 300 kpx In BEBC/TBT Rutharford Applaton Lab. Baclay CEN DPhPE Tori no Uni v. WA31 Coaplatad Dlract alactron production Bruiflê. IIHE Lanonna. J. J. Inducad by 70 GaV/c antiproton Ha I s Inkl Univ. 300 kpx In BEBC/TBT Liverpool Univ. Mons Poly. Btockhola Uni v. WA32 Coapletad Dlract photon production In London. laparlal Collaga Bacon. T. C. pp collisions using BEBC with Ne-H2 filling. 10 kpx. WA33 Coaplatad Systeaatlc search for long- Bol ogna Uni v. MuHer. A. lived heavy particles In the Saclay CEN DPhPE si beaa WA34 Coaplatad Study of charaed particles Bol ogna Uni v, Dlaabrlnl rslsul. C photoproducad In eaulslon CERN plates tagged by tha OMEGA FI oranca Uni v. trlggars Genova. Uni v. /INFN Par: s VI Uni ». Bantender Uni v. Valerie; a Uni v. WA35 Coaplated Measuraaant of tha Heidelberg MPI Faess lar. M. A. correlations botwaan protons and plons In hadron-nueIaus collisions for CO to ISO Gav/c Incoalng aoneta 2S0 EXP. STATUS EXP. TITLE INSTITUTES SPOKESMAN w»36 Withdrawn Exploratory axparlaant at vary Birjtn Univ. Jaca.uat. F. high anargy using CERN ant I nautrI nos In Gargaaalla Palalsaau Ec. Poly. L.P.N. H. E. Orsay Llnttr «ec. Lab. CLAD VA37 withdrawn Study of ant Iproten-proton Aachan TH Hugh*». I.B. Interaction In th» t. 1 GaV CERN c. a. anarsy raglon In th» Glujo* Univ. OMEGA: laarch for narrow Llvarpool Univ. charaad paaKi In K* PI- Pl- ie* PI* PI- PI- PI- syi-tim WA3S Cotiplatad Magnatlc aonopola laarch Bologna Univ. Martaalanov, V.P. at tha SP6 CERN Motcom Khurchatov Xnst. Novosibirsk Inst.NucI.Phys. Sarpukhov I. H. E. P. WA39 Coaplatad Continuation of tha study Blralnghaa Univ. Dowall. J. D. of dl-auon production by CERN PI*-, K + -. p and Polaloau Ec.Poly. L.P.N.H.E. antiprotons at to GaV/c w»to Coaplatad Saarch for narrow boson Aachan TH Franch. B R rasonancac couplad to tha Barl Univ. nucI a on-ant I nucIaon systaa Bonn Univ. CERN C I asgow Uni v. LI varpool Uni v. Ml Ian Uni v. /INFM WAtl Coaplatad Biaa duap run to chack origin CERN Stalnbargar. J. of trlauon and axcaptlonal Oortaund Univ. dlauon avants Haldeibarg Univ. Baclov CEN DPhPE WAi-2 Coaplatad An axparlaant on tha strung Bristol Univ. Extaraann. P. Intaractlons and radlatlva Canava Univ. dacays of hyparons Haldalbarg Univ. Lausanna Univ. London, Sunn Mar» Col laga Rutharford Applaton Lab. WAf3 Coaplatad Bin duap I h GargaaaHe Aaeban TH Mussat/ P. Bar I Unl v. Bargan Uni v. Sru«j»l«, IIHE CERN London* Unlvarslty Collaga Ml Ian Uni v. /INFM Orsay Llnaar Ace. Lab. CLAL3 Palalsaau Ec.Poly. L.P.N.H.E. Strasbourg Univ. Mtt Coaplatad Baarch for quarks In high Bologna Univ. Zlchlchl. A. anargy nautrlno Intaractlons Bologna INFN CERN Frascatl Nat.Lab. (INFN) Host Uni v. /INFN W»tS Coaplatad Charaad partiel» Bologna Univ. DlaabrInl-Pa IazzI, C photoproduction In CERN ••ul>ion Plata» Floranca Univ. Canova Univ./INFN Moscow Labadav Phys.Inst. Pari s VI Unlv. Bantandar Unl v. Va land a Unl v. WA*6 Coaplatad To study Oaas*>- dacay» and Bristol Univ. Btrub. R. tha Elfus- • ha- antl-nu Canava Univ. dacay aoda>hyaaron baaa Haldalbarg Univ. Orsay Llnaar Ace. Lab. CLAL) Rutharford Applaton Lab. Strasbourg Unl v. WA*7 Coaplatad Continuation of tha study Aachan TH Talllnl. B. of nautrlno Intaractlon» Athans Daaokrltos with dlchroaatlc baaas at tha Bonn Univ. BPS. usina BEBC «Iliad with CERN naon London> Xaaarlal Collaga Oxford Univ. Sac lay CEN DPhPE Coaplatad Btudy of baryonlua stata« In Glasgow unlv. Turnbull. R.M. Kt*-i a Ihtaractlons using th» Blmlnghaa Univ. OMEGA «pactroaatar CERN Coaalatad Study of antiproton proton CERN Donald. R.A. Intaractlong Involving karyon Llvarpool Univ. axehang» using tha OMEGA spactroaatar WA50 Coapiatad Biological affacts of CERN Baarll. J. 200 Gav/c proton* CAn »Kploratory Invas11«at Ion> WASl Coaplctaa Btudy of PI »- Na Interaction» waohlngton Univ. «aattla Luaattl. H.J. In BEBC Strasbourg Univ. Warsaw Unl v. «•sa Coapla-tad A sacond tanaratlon aaaa duap Aac^an TH Hyatt. 0. axaarlaant in BCBC Bonn Univ. CERN London. iBparlal Rollaga Oxford unlv. Bad at» CEN OPhPE 281 EXP. STATUS EXP.TITLE INSTITUTES SPOKESMAN WAS3 Wl thdravn A second generatl on biiM duMP Aachan TH Con f ort o> C. experiment In Gargaaelle Bar I Uni v. Bfrgtn Uni v. Bruuali, IIHE CERN London, University College Ml Ian Uni v. /INFN Orsay Llnaar «ce. Lab. CLAD Palalseau Ec.Poly. L.P.N.H.E. Strasbourg Univ. WAS* Coaplatad Beam duip experiment CERN Btalnberger, J. with tOO CiV protons Dortmund Univ. Hal delberg Uni v. Saclay CEN OPhPE WASS Coup I a fd Tait of OMEGA prim accuracy CERN da Bal la*on, A. and K* p «lot-tic scattarlng Neuchate I Uni v. at 12 GaV/c around 90 degrees Paris Collaga da Franca WASE Coapletad Study of N antl-N states CERN Ferrer. A. Produced via baryon axchanga Neuchete I Unl v. In pi* p Interactions using Palalseau Ec.Poly. L.P.N.H.E. the OMEGA priât spectroaeter Paris Collaga de Franca WA57 Completed Studies of high tin vector Bonn Uni v. Newton. D. aeson photoproduc11 on I n the CERN energy range 20 to 70 CtV G I asgow Univ. Lancaster Uni u. Manchester Univ. Pari s VI Uil v. Rutherford Appleton Lab. Shef f I eld Uni v. WASB Coup Ieted Measurement of the llfetlae of Bologna Univ. 01ambrI nl -Pa Iaizl, t charaad particles In nuclear CERN emulsion exposed to an flO GeV F I orence Un I v. brim strah I ung beat) In Ganova Univ. /INFN conjunction with the Moscow Labedev Phys.Inst. OMEGA Prime Spectrometer Par! s VI Unl v. Bantandar Univ. Va I »ne\ a Unl v. WA59 Co.pl«ted Measurement of nucléon Athens Deaokrltos Venus. W. structure functions In horn Bar! Unl v. Bl rut I ngham Unl v. antl neutrl no beams 1 n BEBC Brussels. IIHE fI I Ied with Naon CERN London. Imperial Collage London. University College Munich MPI Oxford Unl v. Palalseau Ec.Poly. L.P.N.H.E. Rutherford Appleton Lab. Saclay CEN OPhPE WABO Coaple-ted Study of t-t range on I un and BaM Unl v. Mande III. L. baryonlua produced In K- p Bl mil ngham Unl v. Interactions using the OMEGA CERN prlac spectrOMeter Milan Unl v. /INFN Par Is VI Unl v. Pavl a Univ. wn&l Completed Investigation of Inelastic Cairo High En. Phys. Lab. Badawy. 0.E. Interactions of high energy hadrons In nuclear emulsions WAB2 Completed Search for the charmed strange Bristol Univ. Btralt. K.P. baryon ACo} Geneva Univ. He! de I berg Unl v. Lausanne Univ. London. Queen Mary Col I age Rutherford Appleton Lab. — — — .___.„_«»_•..»««••• — • — — • — — « — — — — •»• — » — — — •»•»•• — ••""» — — — " — »~ — ** — • — — "™ — ••"" — * — "••"""*" — ~ — "•• — "•••" — """ — — — ' WA63 Completed Inclusive baryon antl-baryon CERN Muller. Arm. production In the centrttl Saclay CEN DPhPE region using the OMEGA s pe ct r omet e r WAS* Completed Measurement of channelling Aarhus Univ. UggarhoJ. E. radiation In a silicon crystal Basel Univ. CERN G I asgow Univ. Lancaster Univ. Manchester Unlv. Rutherford Appleton Lab. Strasbourg Univ. w»6S Completed Further study of prompt CERN Winter, K. neutrino production In ^00 GeV Hamburg Univ. proton nucleus collisions Amsterdam NIKHEF Rome. INFN Moscow I. T. E. P. WABB Completed Further study of prompt Aachen TH Hulth. P.O. neutrino production In proton- Athens Oemolrrltoc nucleus collisions using BEBC Bonn Univ. CERN London. Imperial Col lag» Muni ch MPI Oxford Unl v. Eaclay CEN OPhPE Btockhol m Unl v. EXP. STATUS EXP.TITLE INBTITUTES GPOKESMAN W»67 COHPIated Study of PI ml nut p CERN I niarac-t I ont a-t 85 Gev/c Glasgow Univ. Jackson, J. N. leading -to Kaon plus Kaon plus Liverpool Univ. Kaon M I n u • Kaons Minus In -the final state - Search for new Coapleted rurthtr study of proip-t CERN 8-tal nberger, J. ntvtrlno production In a Oor-taund Uni v. pro-ton baaa duap axparlaan-t Heidelberg Univ. Bac I ay CEN DPhPE Warsaw Inst.NucI . Ras . WA69 Deta-TakIng Photoproduction In -tha Bonn Uni v. Paul. E. anargy rang* 70-200 BaV CERN Erevan Phys.Ins-t. Lancas-tar Uni v. Manchas-tar Uni v. Rutherford Appleton Lab. Shefflaid Uni v. ««70 •eta-TakIng Study of direct photon Canava Uni v. Martin. M. avants In hadronlc CI asgow Uni v. col lisions L I varpool Uni v. Ml I an Uni v. /INFN Neuchatel Uni v. W071 Data-Taking An experiment to study CERN Dlaabrlnl-Palazzl, C Beauty production and Canova Uni v. /INFN llfetlae In tha upgraded Ml I an Uni v. /INFN Oaega prl» Spactroaeter Moscow Labadav Phyt.Intt. Paris VI and VII Univ. Roaa Univ./INFN Santandar Uni v. Val and a Uni v. WA72 Completed A study of fast proton CERN Bzeptycka, M. production In PI{•->-nucI a us Lisbon Nat. Inst. Bel . Res. Interactions using the Neuchate I Uni v. Oaega Spectrometer Pari s VI Uni v. Warsaw Uni v. WA73 Coup Ieted Bubble Chaaber pictures Pari s VI Uni v. Dub oc * J. for a pedagogic axperlaent WA7* Com) Ieted Antlproton-proton glory CERN Gago. J. M. s catterI ng Lisbon Mat. Inst. Sel . Ras. Neuchatal Uni v. Pari s VI Uni v. WA7S CoKPleted An exparlaent to observe Barl Uni v. Romano, G. directly Beauty particles Brussels, IIHE selected by auonlc decay In CERN fMul11 on and to estlaate Dublin Univ. Collage thel r I I fetlaes Japan U. C. London, University College Roaa Univ. Tor I no Uni v. WA7S Preparation Study of the aesons produced Athens Univ. Palano. A. centrally In tha reaction Barl Univ. pp giving pp plus XCO) and BIrMlnghaa Univ. pltOP giving plCOp plus XCO) CERN at 3*0 CeV/c Paris CollC9« da Franca WA77 Data-Taking Search for direct production Athens Univ. Quarcl ah, E. of gluonluM states In high Barl Univ. Pt plCalnus) N collisions Bl rai nghaa Uni v. at 350 GeV/c CERN Paris Collate da Franca Pari s VI Uni v. WA7« Coaplatad Saarch for tha hadroproductI on Barl Univ. PI stl III, P. of B/antl-B pairs Brussels, IIHE CERN London, University Collège Roaa Uni v. /INFN Tori no Uni v. /INFN VA73 Set*Inj-UP Study of neutrino-electron Brussels, IIHE VI nter, K. tcatterlnf at tha BPB CERN Haaburg URIV. Louvaln Cath. Univ. Moscow I.T.E.P. Muni eh Uni V. Naplat Uni v. /INFN ttomm, INFN wA«0 Preparation Study of ralatlvlstlc Darastadt OBI Qutbred, H. H. nucI eus-nucI eus collisions Lawrence Berkeley Laa. Induced ay C163O projectiles Lund Uni v. Marburg Uni v. Munftmr Univ. Oak Rldae Nat. Lab. Warsaw Uni v. WA»1 Preparation Measureaents of pair Aarhus Uni v. Uaaerhej. C. production under channeling CIRN candi tiens by T0-1S0 Cav Btrasbeura/C. R. N. photons Incident an slnale crystals WAI/1 Ceapleted Meatureaent af CCRN Oydak. F. • I n{ that awe I nsiera^sauaraa In Dertaund Univ. •eallaptanlc nautrlno/Fa Heldelbara Univ. Interact I ant with ••claw CCN DPKPC Man precisian Warsaw Inst. Nuc I. Ras. 283 EXP. STATUS EXP. TITLE INSTITUTES SPOKESMAN •A1B/Z Coapl.ted High precl.l ure.ent """„ , «Inter. K. of the rttl o Hiiburs Unl NA1 coapietec phot opr oduc* I on of vector and Ml Jj"^" J,">iNpS tea ar n Torino Uni». Tri este Uni «. London. West-field Col lag* *NA2 CoâpTêted Êlae-troaagna-tl c Interactions *»eh#n, T" . _ _ Sloan. T. Of DUOIII CERN Fral burg Uni w. Heaburg Uni v. Haldalbarg MPI Lancaster Uni v. LI varpoo I Uni w. Mariai I la C. P. P. M. Mons Uni v. Oxford Uni v. Rutherford «ppllton Lab. Bhaf f I aid Uni v. Tor I no Uni v. Uppta la Uni w. Wariaw Uni v. Wupper-tal Uni v. Va I a Unl v. *IA3 Coapla-tad Dlrac-t photon production In CERN Mlchallnl, A. hadron-hadron collisions at Orsay Llnaar Ace. Lab. CLAD tna SP9 Ptlslltau Ec.Poly. L. P. N. H. E. Paris Collage da Franca PI sa Unl v. /INFN Sac I ay CEN DPhPE MA*f CoHpla-tad Inc lull vi daap Inalastlc mon Bologna Univ. Voss» R. scattarIng CERN Dubna J. I. N. R. Muni ch Unl v. Baclay CEN OPhPE NA5 Coaplatad Study of hard hadron-hadron Barl Univ. Bayboth. P. collisions with a Krtamr Cracow Jag. Univ. chaabar vartax spactromatar Llvarpool Univ. and a caloriaatar -trigger Munich MPI NI Jaagan Cath. Unl v. NAE Coaplatad Nautron alastlc scattering Fralburg Univ. Rung*, K. at vary mall angles Moscow I.T.E.P. NA7 Coinplatad MaasuraMant of the CERN Frank. B. G. F. a IactroaagnatI c for» factors Frascatl Nat.Lab. CINFN3 of PI and K aasont at tha SPS London/ Westfleld Collage Ml Ian Unl v. /INFN Pisa Unl v. /INFN Bouthaapton Univ. Torino Univ. Tr I «ste Unl v. NAS Complc-fd Hadron alastlc scattering CIeraont-Ferrand Univ. Brafstroa. P. at tail I angles Leningrad Inst. Lyon Unl v. Uppsala Unl v. NAS Coapleted Study of final states In daap Aachen TH Sloan. T. Inelastic uvon scattering Annecy L.A.P.P. CERN Frelburg Unlv. Haaburg DESV HaMburg Un I v. Kiel Univ. Lancaster Unl v, LI veraool Unl v. Marsal Ile C. P. P. M. Mons Univ. Munich MPI Orsay Llnaar Ace. Lab. CLALD Oxford Univ. Rutherford Aapleton Lab. Bhaf f I eld Uni v. Tori no Unl v. Uppsala Unl v. «upperta I Unl ». NAio Coapleted Hlfh resolution study of the CERN ------•.-.-----.--....---... Inclusive production of Naples Unl v. /INr'N •a*ilva auon silrt by Intense Palalsaau Ec.Poly. L. ".N.H.E. PI on boons •trasboura./C. R. N. Zurl ch E. T. H. «All Coaplated Meesureaent of charaed Aasterdan NIKHEF * " icTânnârT'AT particle production Bristol Univ. In hadronlc reactions CERN Cracow Inst.NucI.Phy«. Munich MPI Rutherford Appleton Latj. NA12 Coapletad Study of "I-a Interactions Annecy L.A.P.P. ProkaihkIn. vu D with neutral final states Belfjlua I.I.8. i. rr.«.n«iB. Lot Alaaos Nat. Lab. Serpukhov I. H. E. P. EXP. STATUS EXP.TÎTLE INSTITUTES SPOKESMAN NA13 Coiplctid Etsrch for direct avldanci Brutitli, IIHE Fl thmr, C. M. for Cham In hadronlc CERN Interactions uil n£ a high Oxford L'nl v. resolution bubble chn•C<^ Padova Uni v. Ron Uni v. Rutherford Apple-ton Lab. Tri este Uni v. MAIt Coapleted PhotoproduetI on ai high Athens Nat. Itch. Uni v. Tral Ile, D. energy and high Intensity CERN London. laperlal Collage Orny Linear Ace. L&b. CLAL3 Palalsaau Ec.Poly. '.. P. N. H. E. Parl* College de Prance Sac I ay CEN DPhPE Bouthaapton Univ. Strasbourg Univ. Warsaw Uni v. NA15 Coapleted Search for charaed hadron Boabay Univ. Hal hotra, P. K. production In pi- nucleus Interaction» In nuclear eau I•I on NA16 Ceapleted Study of tha hadronl c Aasterdaa NIKHEF Flsher, CM production and the properties Brussels/ IIHE of new particles using CERN LEBC-EMS Mtdrl d J. E. N. Mom Poly. NI Jaegen Cath. Univ. Oxford Uni v. Padova Uni v. Pari s VI Uni v. Roae Uni v. Rutherford Appleton Lab. Serpukhov I. H. E. P. Btockhola Uni v. Strasbourg Univ. Tor I no Univ. Tri este Uni v. Vienna Aked. Wlssensch. NA17 Coapleted MoaentuM and angular Jadavpur Univ. VI I lar, E. correlations study In Lyon Un I v. Pi- nuclei Jets at high Bantander Un! v. energies using an eaulslon Strasbourg Uni v. telescope technique with •agnetIc field NAIS Coapletftd Search for short-lived Bern Univ. Hugentob1er.E./Hani particles produced on nuclei Munich MPI with a heavy liquid alnl bubbI a chaaber NA19 Coapleted Direct observation of beauty Barl Univ. Musset, p. particles selected by auonlc Brussels. IIHE decay In aauIsI on CERN Dublin Univ. Collage London* Ellrkbeck College London. University Col Itgi MMton-Keynes Open Univ. Roae Univ. Tori no Uni v. NA20 Coapleted Measureaent of PI*-, k*-, CERN Waehsauth. H. p*- yields In *00 CaV proton beryl I Iua and copper Rutherford Apple-ton Lab. col I IsIons NA21 Withdrawn « high statistics study of L I verpoo I Unl v. Ouboc. J. ant I proton-proton Mons Poly. annlhilatlOR physics at Paris Collage da Trance the EHS Paris VI Univ. Serpukhov I. H. E. P. Strasbourg Univ. NA22 Coapleted Tha Influence of aarton Aachen TH Klttel. w. structure on hadronlc BerllnCE} Inst.H.En. "hys I cs Interaction» In EHS with Brussels. IIHE Kaon*/PI*/p beea at 2S0 Cracow Inst.Nue I.Phys. CaV/c Erevan Phy».Inst. Helsinki Univ. NI Jaegen Cath. Uni v. Rio da Janeiro Phys.Res.Center Berpukhov I. H. E. P. Warsaw Uni v. NA23 Coapleted Study of dlffractlva Boabay. Tata Intt. Markytan. M. dissociation especially Into CERN strange and cheraed particles Benova Univ./INFN • I in the EHS Inntbrurk Uni v. Japan 'i. s. Madrid J. E. N. Mont Uni v. Rutgert Uni v. Berpukliov I. H. E. P. Tannas see Uni v. Vlmnnm «kid. Wlssenseh. «•2* Investigation of deep Barl Univ. Prat»I. K. P. Inelastic scattering Freiburg Univ. processes Involving large Most»* I. T. E. P. •IT) «Iract photons In Muni <:h MPI the f I rial state EXP. STATUS EXP.TITLE INSTITUTES SPOKESMAN NA2S Co>PIeted Study of cham and bottoa Bar I Uni v. Tavernler. S. parilclti production using Brunei», IIHE a holographic bubblo chanbtr CERN Mon» Uni v. London. Unlvtrilty Col legs Part « VI Uni v. Strasbourg Univ. Vienna Akad. Vlssensch. NA26 Coip 1st»d A prototype experiment to Brut«eIs. IIHE Fl shar. C. M. study charaad partiels CERN production and decay using a Oxford Uni w. holographic high resolution Padova Uni v. hydrogen cbinbtr CHOLEBC) Roafi Un I v. and the European Hybrid Rutherford Appleton Lab. Spectroaeter Stockhol M Uni v. Tr I este Uni v. Vienna Akad. Wlssensch. NA27 Couple-led An experlaent to Measure Aachen TH Mentanat. L. accurately the I I fail us of Brussels. IIHE the D(zero) D+- F + - Boabay Univ. Leabda(c) char» particles CERN and to study their hadronlc Duke Uni v. Cenova Unlv./XNFN proper*Ies Japan U. C. L I varpool Uni v. Madr I d J. E. N. Mom Uni v. Oxford Uni v. Padova Uni v. Pari s Col lege de France Pari s VI Uni v. Roae Un 1 v. Rutgers Univ. Rutherford Appleton Lab. Serpukhov 2. H. E. P. Btockhola Uni v. Strasbourg Univ. Tannessae Uni v. Tor I no Univ. Tel esta Uni v. Vienna Akad. Wlssensch. Zeuthen Inst. H. En. Phys. N02S Coapleted Study of shadowing and Aachen TH Sloan. T. hadron production In high Annecy L. A. P. P. energy auon scattering CERN using nuclear targets Frel burg Uni v. Haaburg DE8V Haaburg Uni v. Kiel Uni v. Lancaster Uni v. LI verpool Uni v. Mariai I le C. P. P. M. Mons Uni v. Munich MPI Orsay Linear Ace. Lab. CLAL3 Oxford Uni v. Rutherford Applaten Lab. SheffI eld Uni v. Tor I no Univ. Uppsala Univ. WuppertaI Unl v. NA29 Coapleted Study of PI(a I nutJpICzaroj CIeraont-Ferrand Univ. Bel 11 nl , c. /Fom, L. production via Prlaakoff Fraseatl Nat.Lab. CINFN5 Effect on nuclei Ml Ian Uni v. /INFN Pisa Uni v. /INFN Torino Univ. Tr I este Unl v. London. Westfleld College NA30 Coapleted Precision daterainatI on Aaas Lab. von Darda I . C. of the llfetlae of CERN the nmutrmI pI on Chi cago Uni v. Lund Uni v. Pari s VI Unl v. NA31 Data-Taking Measurement of the ratio ot CERN Wtihl. H. aagnltudas squared of Dortaund Unl v. eta 00 and eta • - Edl nburgh Uni v. Orsay LI near Ace. Lab. CLAD Pisa Uni v. /I SI «ten CHS NA32 Oata-TakIng Invest I«at I on of Chara «attardai» NIKHEF Wai lhaaaer. *>. production In hadronlc Brl stol Unl v. InteraetI on* uslng CERN hi «jh-resol ut I on i! II cor Cracow Inst.NucI.Phys. detectors Munich MPI Rutherford Appleton Lab. Santander Univ. Valencia Univ. NA33 Coapleted An expertaental study Albany BUNV «teal I 11 eux. J. of si neje-vertex (•(-)-•(•»)) Annecy L. A. ». P. Mir creation lit a crystal Frascatl Nat.Lab. (XNFN) Lyon Unl v. EXP 5TATU6 EXP. TITLE INSTITUTES SPOKESMAN MA3* Sett I ng-Up Ltpion production Brookhavm Nat. Lab. McCubbl n. N. A. CERN Hal da Ibarg Uni w. London» Bl rkbeck Collage London* Univtr^liy Collar* Lot Alamos Nat. Lab. Lund Uni v. Montraal McGI I I Univ. Montreal Uni v. Moscow Labadav Phys.Inct. Moscow Eng. Phys. Int-t. Novosibirsk Inst.NucI . Phys . PI ttsburgh Uni v. Rutherford Appleton Lab. Sac lay CEN OPhPE Stockholm Uni v. Tal -Awl v Uni v. NA3S Preparatlon Study of relatlvlstlc Athens Uni v. Stock. R. nucleus-nucleus collisions Bar I Uni v. CERN Cracow Init.Nue I. Phys. Darmstadt CSI Frankfurt/Main Univ. Fral burg Uni v. Hcl da Ibarg Uni v. Lawranca Barkalay Lab. Marburg Uni v. Munich MPI Taxas ASM Univ. Warsaw Uni v. Zagrab Rudjer Boskovlc Ini-t. NA3S Preparation The production of strange Athens Nat. Tech. Univ. Cal «t. w. M. baryons and antlbaryons with Bergen Uni v. ralatlvlstlc light Ion BlralnghaM Univ. collisions at -the CERN SPS Brookhaven Nat. Lab. Carnegie-Mellon Univ. CERN Chandigarh. Punjab Univ. City College of New Vork Cracow In»t. NucI . Phyt. Lawrence Berkeley Lab. Strasbourg Univ. Vienna Akad. wlssensch. NA37 Praparatlon Oetalled Measurements Bl e lefeld Uni v. Rlth, K. of structure functions Frel burg Uni v. frOM nucléons and nuclei Heidelberg MPI Indiana Univ. Mal nz Uni v. Mons Uni v. Neuchate I Unl v. Oxford Uni v. U. C. Santa Cruz S. I. N. Tori no Uni v. /INFN Uppsa la Uni v. Warsaw Uni v. wuppertaI Univ. MA3A Preparation Stvdy of high-energy Bergen Univ. Klubarg. L. nucI eus - nue I eus Interactions CERN with the enlarged C I a mont-Far rand Univ. NA10 d'Muon spectroMetar Lisbon Nat. Inst. Sel . Res. Lyon Univ. Neuchatel Uni v. Orsay I. P. N. Palalteau Ec.Poly. L.P.N.H.E. Bt rasbourg/C. R. N. Va land a Unl v. Nfllt/2 Data-Taking A program of heavy Athens Nat. Tech. Univ. Tral I la. 0. flavour photoproduction CERN London. Imperial Coilaga Orsay Linear Ace Lab. CLAD Paris Collage >i« France Saclay CEN DHnr-E Southampton Univ. Strasbourg Univ. Warsaw Unl v. NA34/2 Preparation Btwdy of high energy Brookhaven Nat. Lab. Spacht. H. J. densities over extended CERN nuclear voluaes via nucleus Heidelberg Univ. -nucleus collisions at the BPB Lot Alamos Nat.Lab. Lund Unl v. Montraal McCI)I Univ. Montraal Unl v. Moscow Labadav Phys.Intt. Moscow E»9. Phys. Intt. Novosibirsk Inst.NucI.Phys. Pittsburgh Unlv. Bac I ay CEN OPhPE Stockholm Unl v. Tel-Aviv Univ. 2.87 EXP. STATUE EXP.TITLE INSTITUTES SPOKESMAN UAi Data-Taking A f PI «olid ang I a datactor Aachen TH Rubbla, C./Levaque, for -tha SPS used at a pro-ton Aastardea NIKHEF • n-t I pro-ton collldar a-t a Annecy L. A. P. P. can-tra of ••«> intrgy of Bl ruing ha» Univ. 630 GaV CERN Harvard Uni v. Hal • I nkl Uni v. KI • I Uni v. London. laperlal Collage London» Quaen Mary College Padova Uni v. Parli Collas* d" Franca U.C. Rlvertlda Roaa Univ. Ru-tharford Appleton Lab. Sac lay CEN DPhPE VI innii Ins-t. H. En. Phy*. CHEPHV3 VI tconil n Univ. UA2 Data-Taking Study of ant I proton-pro-ton Barn Univ. Darrlula-t. P. Interaction» at 5*0 GaV e.a. Cambridge Univ. anargy CERN Copenhagen Niels Bohr In«t. Heidelberg Univ. Ml Ian Uni v. /INFN Ortay LI naar Ace. Lab. CLAD Pavl a Univ. Perugla Univ. PI *a Uni v. /INFN Sac lay CEN DPhPE UA3 Coapleted Baarch for Magnetic Monopole» Annacy L.A.P.P. at tha ant I proton-pro-ton CERN colliding ring UAf Coaplated Measureaent of elaitlc Aasterdaa NIKHEF Matthlae. C. «catterlng In -the Couloab CERN Intarferanca raglon at the Genova Univ./INFN ant I proton-proton collldar Naplai Univ. /INFN Palalieau Ec.Poly. L. P. N. H. E. Pita Univ. /INFN UA5 Completed Investigation of proton- Bonn Univ. Rushbrooke» J. D. antiproton avant! at 54-0 CaV BriiittlSi IIHE e. a. anargy with a lirnmr Caabrldga Univ. chaabar detection systea CERN Stockhol M Uni v. UAB Data-Taking An Internal hydrogen Jet CERN Joseph. C. /Dick. L. target In -the BPS to study Lausanne Univ. Inclusive a IactroaagnatIc Michigan Univ. final state» and laabda Rockefeller Univ. production In ant I pro-ton-proton am at 2N-. 3 GtV c. a. ~UA7 Data-Taking Measurement by silicon shower Japan U.C. „_.._.. Murale I. V. detectors of tha Invariant Naplas Univ./INFN cros» - sect I on of pltaeroj's enltted close to iero dagraa ^ ...... "ÛÂâ Installation Study of Jat structura U. C. L.A. Behlaln. P. In high aass diffraction at -tha SPB Collider "wÂs/â'coapTêtâd Ân'àxpI oratory Invas11 flat I on Bonn Uni». Rushbrooka. J.C. of p/antl-p Interactions at Brussals. IIHE 600-900 CaV ca energy Ceabrldga Univ. at the SPB Collldar CERN Btoekhola Uni v. ~RÎU7 Coâpîâtâd MuTïriïa"«Baaa-rây production Brookhavan Nat. Lab. Borala. B. In PP collisions Roua Univ...... E "*ÎÔê"""coâp7âtêd"* Study of high transvars* £ ?*Lh,« Caalllarl. L. aoaentuM phenoaana Coluabla Oxford Univ. Rockafallar Univ. "RIÔS côâpïêtêd Baarch for aagnetlc aonopoles CERN KaniardJIan. C. usina the superconducting Roaa Univ. solanold at tha I8R "ïïïo""co»pïatàd 8Ïûir*oï*MÎn"ââiî"«ïicfron Brookhavan Nat. Lab. Caalllarl. L. pairs and hljh tram varia CERN aoaantua phanoaana Mlchlaan Stata Univ. Oxford Uni v. Rockafallar Uni v. "iâÔ7 Coâpiâtei âââîT ân«7a dTffraction CKRN Bai»». J. C. -••«••» •* » •'•• a2Kh55*.r-Sj,rj. _ "iâoi"""coâpîa*âd iaarêhïord7riê*inot«B Brookhavah Nat. Lab. Borflla. B. production at tha XSR «RM Unl w "i»âÔ»""coiiîâtâd Hrïh"iB»»*âûon"iâTr«*âtid î52Sev «-.*.•». P. Braeel ni. F. /Tl n«.«. ...OC.t.- i...r... «RN-r- oniw M. X. T. Map las Uni v. /INFN PI ta Univ./INFN *ïâîô c#ââ7âtâd""""rrâêl«a aaaavraaant of tha CERN .-„-», O#l ****** T* N310 "•""" araton-antlaraton total Naplas Uni v./INFN tl .t tha CKRN 2BR 5'jVv. «taSÇ Braak 2$,» EXP. STATUS EXP.TITLE INSTITUTES SPOKESMAN R211 Coiplt*»d Milluriitnt of the antiproton Louviln Ceth. Univ. Favart. D. proton total cron-KCtlon Nor-t h»tl tar n Unix. at th« CERN ISR R301 Coapleted Starch for aagnetlc aonopoles Bologna Univ. Glecoaelll, C. Ftrnllab RtOl Coapleted Isobar production at ISR Annaey L.A.P.P. Winter» K. anerglas CERN Haaburg Uni v. Vianna Akad. Vlninicb. RH-06 Coaplatad Search for naw parti clfi Bologna Univ. Massaa» T. at the ISR CERN RtO7 Coaplatad Study of general avants and of CERN Dalla Negra. H. avants Including a fast Paris Col lag» da Frmncm forward partlcla using tha SFM Haldaibarg Univ. Kar I >r uha Uni v. R409 Withdrawn A alnlaua bin trlggar axparl- CERN Btelnberger. J. aant uilng tha BFM to (tudy typical baaa-baaa avants RtlO Coaplatad High transvarsa aoaantua Llvarpool Univ. «Ibro». M.C. avants and cantral correlation M.I.T. at tha SFM Orsay Linear Ace. Lab. CLAL3 Rutharford Appiaton Lab. Copanhagen MI•I * Bohr Intt. Bargan Uni v. Lund Uni v. RH11 Coaplatad Doubla diffraction dissocia- Pavla Univ. Mantovani< G.C. tI on at the 1ER Prlncaton Inst.Adv.Stud I as RHlt Coaplatad Study of high aass Muon pair Annacy L.A.P.P. Winter. K. production at tha EFM CERN Haaburg Uni v. Hal da I barg Uni v. Vianna AJcad. Vlutnich. RtlS Coaplatad Study of avants with larga Bologna Univ. Massaa* T. angle alactrons In tha SFM CERN RtlS Coaplatad Study of rar» avants at tha Annacy L.A.P.P. Caist. W. M. SFM CERN Dortaund Univ. Hal da I barg Uni v. Paris Collage da Franca Warsaw Univ. RH-17 Coaplatad Study of axcluslva nautron CERN Mantovanl. C. C. raactlons and coherent proton- Pavla Univ. dautaron procassas with tha SFM RtlS Coaplatad Study of light Ion collisions Aaas Lab. Ottarlund. I. Bol ogna Uni v. CERN Dortaund Uni v. Hal dal barg Uni v. Lawranca Berkeley Lab. Lund Uni v. Warsaw Uni v. SCM9 Ceaplatad Study of avants with forward Aaas Lab. Calst. W.M. Identified particles at tha Bologna Univ. BFM CERN Dortaund Univ. Heidelberg Univ. Warsaw Inst.NucI.Ras. a.»ao Coaplatad Btudy of In s physics In Aaas Lab. Mayar. W. T. entl-p p Interactions at the Bologna Univ. Split Field Magnat CERN Dortaund Univ. Heidelberg Univ. Warsaw Uni v. R»21 Coaplated Btudy of proton-proton and Bologna Univ. 21 chichi. A. proton-ant I proton collisions Bologna ZNFN at «ha BFM facility of tha CERN CERN IBR Frascatl Nat.Lab. CINFN) R*aa Coaplatad Btudy of haavy flavour* Bologna Univ. Zlchlchl. A. production In Cpp) Bologna XNFN Intaractlons at S2 Gsv c.a. CERN Frascatl Nat.Lab. CXNFN) R5D1 Coaplatad Search for aagnatlc aonopolas Annecy L.A.P.P. Muenat. P. KCOE Coaplatad A hunt for charaed parti clas CERN «tullar. P. at tha IBR Harvard Univ. Munich Univ. U.C. Riverside Northwestern Uni v. RCwt* "eoBPleted* Naw Partiela Production at Aachen TH Naroska. B. Forward Anglas CERN Harvard Univ. Munich Univ. Northwestern Univ. U.C. Rivers I da 289 EXP. STATUS EXP.TITLE INSTITUTES SPOKESMAN R6D7 Coapleted Cor r a I a-t I on s bttvtfn high Aasterdaa NIKHEF Bans. J. C. I ongl t. aoaant ua •••ont Louwal n Cath. Uni w. produced in p p collisions Northwestern Univ. R60S Coap1eted Larga-X had r on p h ys 1 ci and CERN Schlaln. P. corre1 at 1 on• wl -th centra1 C1triont-Farrand Univ. U. C. L. A. Sac lay CEN DPhPE R702 Coap1etad Baarch for chsmid par-t 1 c 1 as CERN Oarrlulat. P. at tha IBR Saclay CEN DPhN Zurl ch E. T. H. R703 Coaplcted Evaluation of a larga streamer Bonn Univ. Ruthbrooke. J. C. chaaber detection systaa and a Bruliili, IIHE study of antiproton proton- Caabrldge Univ. proton proton di ffarancas CERN at ISR energies Btockhola Univ. R70M- Coaplatad Charaonlua spactroscopy at tha Annecy L.A.P.P. Micrl, M. ISR using an antiproton baa» CERN and a hydrogen Jat targat Ganova Unlv. /INFN Lyon Uni v. Os I o Uni v. Roae Uni v. Tor I no Uni v. R8D5 Coaplated Maasuraaant of tha ratio of CERN WetherelI. A.M. the raai to tha laaglnary part Roaa of tha pp strong Interaction forward scattering aaplltuds RS06 Coaplated Study of larga transverse Athens Uni v. Willis. W. J. aouentua phenoaana Athens Nat. Tech. Univ. Brookhaven Nat. Lab. CERN Syracuse Univ. R607 Coapleted A study of I arga-1ransvers « Brookhaven Nat. Lab. Boggl Id. H. aoaentua phenomena CaabrIdge Uni v. CERN Copenhagen Niels Bohr Inst. London. Queen Mary Col I age Lund Uni v. Pennsylvania Unlv Phlladelphli PIttsburgh Univ. Rutherford «pole-ton Lab. Te I - AvI v Uni v. R8 08 Coapleted A study of direct Athens Uni v. Wl I I I s. W. J. photon production Brookhaven Nat. Lab. CaabrI dge Uni v. CERN Copenhagen Niels Bohr Inst. London. Quean Mary Collage Lund Uni v. Moscow Labadav Phys.lnst. Moscow Eng.Phys.Inst. Novosibirsk Inst.NucI.Phys. Pennsylvania Unlv Phlladelphli PI ttsburgh Uni v. Rutherford Applaton Lab. Ta ! -AvI v Uni v. PE97 Coap1eted CERN Picasso. E. the anonalous aagnetlc Darasbury Lab. aoaant of the auon Mal m Uni v. P6131 Coup 1 eted Measureaant of production of Geneva Un 1 v. Martin. M. strange bosons In the reactions K- p -> antIKO PI- p KO PI •» p PS132 Coap 1 wit ad Syaaetrlc b1tpectroaeter for Annecy L. A. P. P. Stroot. J. P. a systcaatlc search of haavy Balgl UM I. I. S. N. parti c1 as Fral burg Uni v. PS13S Coap1eted Mu 1 housa I. S. E. A. Schneagans. M. pair and gaaaa-ray production Strasbourg Unlv. In ant 1 proton-proton Tor 1 no Unlv. annlhllatlon at rest PS136 Coap1ated Maasuraaant of reaction CERN Lwtx. C. Pl-P (forward) • PI* PI- n Munich MPI on a transversely polarized proton targat PS137 Coap1atad Maasuraaant of tha Sac lay CEN DPhPE Wan Roi tua L. polar1zatIon In K» neutron charge exchange PS1H0 Coaplatad Maasuraaant of tha reaction CERN BIUB. W. K- p • laabda (forward} * Muni eh MPI neutral aason PSltl Coa»•atad Spin dependent affects In CERN Dick. L. proton-proton Interactions at Annecy L. A. P. P. 2t Gev/c Oxford Uni v. PSi»2 Coap1atad X-rays of protonlua Daretbury Lab. ••1 lay. J. Cant 1-p p atoa) Mal n* uni v. Vancouver Uni v. exp. STATUS EXP. TITLE INSTITUTES SPOKESMAN PSlf3 Coapleted A itarch for mtsr CI iraon-t-Fir rand Univ. Ku I landar, 8. Lyon Univ. Lund Uni v. Uppsa la Uni v. Vartm» Uni ». PSlfS Couple-tad Study of the reaction and Hal da Ibtrg MPI Kl I I an. K. scattering cross section for Hal da I berg Uni v. antiproton - proton at antiproton aoaenta be/ov 1 CeV/c PS1S0 COMP 1 eted Study of the channel ling Aarhus Uni v. UggerhoJ. E. CERN structurât at high énergie» Strasbourg Univ. P81S1 C oap 1 a-tffd Exot 1 c a-t OKI Base 1 Uni v. Tauschar, L. Kar I «ruhe Uni v. Btockholn Uni v. PS1S2 Coap 1 e-ted Further study of hypernuclear Lyon Univ. Plakarz, H. Warsaw Univ. P6153 Coap1 a tad Hunt for na r r ow-ba r y on CERN Bal M on, P. foraatlon In Pl-p backward Palalsaau Ec.Poly. L. P. N. H. E. elastic scattering Paris Collage da France PSISt Coap1atad Heidelberg MPI Kl 1 1 an, K. on nuclei Baclay CEN DPhN Strasbourg Uni v. PG1SS Coap1atad Properties of exotic light Orsay C. S. N. 6. M. Klaplsch. R. nuclei produced at tha PS Orsay C. N. R. B. PS15E Coap1atad Measuraaent of the Annacy L. A. P. P. Dick, L. CERN elastic and charge exchange Oxford Uni v. scattering at 2» GevVe PS1S7 Coap1atad High Precision MeasureMent of CERN Barralat. E. Palaisaau Ec.Poly. L.P.N.H.E. Paris Collage da France psisa Basa 1 Univ. Tavschar. L. Kar 1 sruha Uni v. Stockhola Uni v. P6159 Coap1atad 6-trangi dlbaryon systeas Roae Uni v. Paul!, E. Saclay CEN DPhPE Vanderbl 11 Uni v. PS160 Coapletad Edl nburgh Uni v. LItchf1 eld, P. J. paraaeters 1n the Rutherford Apple-ton Lab. reaction PI* p - K-»slgaa + London. Vestfleld College PB1G1 Completed Search for strongly bound Base I Univ. Koch. H. states of the Antl-p p. Kar I sruhe Uni v. Antl-p d and Ant I-PCNN. . . 3 Stockhola Uni v. states Strasbourg Univ. Thessa I onl k I Unl v. I» SI 62 Coapleted Study of the structure of Orsay C. S. N. S. M. Thl bau 11. C. axotlc light nuclal produced Orsay C. N. R. 5. at tha PS Orsay I.P.N. PE1B3 Coaplated Burch for narrow baryontua CERN Watcher. T. states near tha antl- p p Heidelberg MPI threshold Hal da I berg Uni v. Baclay CEN DPhN P616* Coar. I atad Tha Influence of channelling Aarhus Univ. Uggerhoj. E. on atoalc and nuclear reaction CERN yields Strasbourg Univ. PS16S Coapletad Measvreaent of tha Bl ral nghax Univ. Batty. C. J. K- p scattering length at Rutherford Appleton Lab. threshold by observation of Surrey Univ. keonIc-hydrogen x-ray* froa condensed target PS16S Coap1ated Search for Clgaa hyeernuclear Heidelberg MPI Bruckner. W. states usina the strangeness Hal dalbarg Uni v. exchange reactions Saclay CEN DPhN (K -. pi -) and CK -, pi O P11S7 Coaplatad Background calibration for • CERN Florlnl, E. proton-11 fat 1ae detector Fraieatl Nat.Lab. (INFN) Ml Ian Uni v. /INFN Tor 1 no Uni v. psita Coapleted Test of a prototype of a Orsay Linear Ace. Lab. (LAD Barloutaud. R. proton llfetlae detector In a Palalseau Ec.Poly. L. P. N. H. E. neutrino beast at tha P6 •aclay CEN DPhPE Coapleted Search for neutrino CERN Wotschack. J. aid 1 latl em Dortaund Uni v. Heidelberg Uni v. Sac lay CEN DPhPE PB.1T0 Oeta-Teklng Precision aeasuraaents of tha Fsrrara Univ. Dalai ai. p. araten electroaagnetIc fora Padova Univ. factars In tha tlae-llke Bac I ay CEN DPhN raglan and vector aasan ••Clay CEN OPhPE saectrescepy Terme Unl». (LCAR3 291 EXP. STATUS EXP.TITLE INSTITUTES SPOKESMAN FB171 Dl-ta-Tik I ng Study of ant I proton-proton CERN I nteraet I ont at rest In a Mal nz Unl v. hydrogen gas tlrgf* at LEAR Muni eh Uni v. (ASTERIX) Orsay Linear Ace. Lab. (LAD Vancouver Un) v. VI ctori a Unl v. VI anna. Inst.RadIumforschung*Kernphyslk Zur I ch Unl v. PS172 Data-Tak I ng Antlpro'ton-proton troll- Amsterdam NIKHEF Bugg. O. •actions and ipln effects I Ganava Univ. ant I proton-proton • K+K-, London. Duftn Mary Collage PI* PI-. ant I proton-proton Surrey Univ. • bom 200 MaV/c CLEAR) Tri esta Uni v. PS173 Data-Taking Mmuriaint of antiproton- Heidelberg MPI Wai cher, T. proton crof•- sectI ons at low Heidelberg Univ. antiproton momenta Laval Univ. CLEAR) Mal nz Uni v. Rutgers Uni v. PB17» Data-Taking Precision survey of X-rayi Aasterda» NIKHEF Davles, J.D. fro* antiproton proton Blralngha» Univ. Cant Iproton-deuteron) atoas Delft Tech. Univ. using the Initial LEAR beau Rutherford Appleton Lab. VI I Max and Mary Collage VI I I Iaasburg P517S Data-Taking Measurement of ths Karlsruhe KfK / Univ. Slaons. L.M. antlprotonle Lyaan- and Balaer X-rays of antlproton-H and antiproton-D atoas at very low target pressures P6Î76 Data-Taking Study of X-ray and gamma-ray Basel Univ. Poth. H. spectra frOM antlprotonlc Karlsruhe KfK / Univ. atoms at the slowly extracted Stockholm Univ. antiproton beaa of LEAR Strasbourg Univ. Thessa I onl k I Unl v. PS177 Data-Taking Search for heavy hyparnuclel Amsterdam NIKHEF Pollkanov. S. M. AT LEAR CERN Darastadt CSI Grenoble. C. E. N. Orsay C. S. N. S. M. Baclay CEN DPhfJ Uppsal a Unl v. Warsaw Unl v. PS17S Data-Taking Study of antineutron Caglla>-I Univ. Brassant, T. production at LEAR Padova Univ. Torino Univ. PS179 Data-Taking Study of the Interaction of Bergen Univ. Plraglno C. low-ensrgy antiprotons with Brescia Univ. Hydrogen 2. Helium 3, Oubna J. I.N. R. Helium t, Naon-nuclel Frascatl Nat.Lab. CINFN) using a streamer chamber Oslo Univ. In magnetic field Padova Univ. Pavi a Univ. Torino Univ. PS1S0 Completed Search for neutrino Athens Univ. Baldo-CeoHn. M. oscillations PadovaUnlv. at CERN PS using BEBC Pisa Unlv./INFN VI scons In Univ. PS1S1 Completed Contribution of the CHARM CERN Winter. K. collaboration to the CERN Hamburg Univ. neutrino oscillation program Amsterdam NIKHEF Rome Unlv./INFN Moscow I. T. E. P. PS182 Data-Taking Investigations on baryonlum Basel Univ. * Tauseher,~L and other rare antiproton Stockholm Univ. -proton annihilation «odes Thes•ft I on)kI Univ. uilng high resolution pICo) spectrometers PS1B3 Data-Taking Search for bound Athens Univ. Smith." B~ tk" " " ant InucI eon-nucI eon states U.C. Irvine " ' using a precision garni and Karlsruhe KfK / Univ. charged pi on spectrometer K'ew Mexico Univ., Albuquerque at LEAR Pennsylvania State Unl». Btresbourg/C. R. N. PBlSf Data-Taking Study of ant I pr ot on-nuc I eus Grenoble. C. E. N. Carrêtâ """"' Interaction with a high Baclay CEN OPhN resolution magnetic Btrasbourg/C.R. N. •pactroaeter Tel-Aviv Univ. "Bias Data-Taking Btudy of threshold production Car nag I e - Me I I on Univ. '*KM ^ânT'ic"* ""' of hyperon-»ntI hyper on pairs ErIangen-Nuernberg Univ. In ant I proton-proton Fralburg Univ. Interactions at LEAR Illinois Univ. Champaign JulIch KFA HI ce Uni v. Houston Baclay CEN DPhN Uppsala Univ. Vienna Akad. Wltsensch. PS1A6 Oata-Taklng Mucfmr excitations ky Munich TU " ----- "»ô"Êrii""" " antlprotons and antlprotonlc atoas EXP. STATUS EXP. TITLE INSTITUTES SPOKESMAN PS1S7 c»i>l»tid A good ttatlttlet i-tudy of Lot Alaaot Nat. Lab. DlClneoao, N. J. antiproton Intaractlons Cranobla. I. B. N. with nuclal Psiiâ* Data- Tait Ing Maaturaaan-t« of channelling Aarhut Unix. UggarhoJ. E. radiation and Itt CERN polarization, x-ray Btratbourg Univ. axcltatlon. togather with deviation! froa Landau dlttrlbutlont PB1BS "priiiritTon High praeltlon mmtl CERN .„.,_„ Thibault. C. aaaeuraaentt with a Ortay C. S. N. S. M. rtdl ofrfqvtticy Mitt tpactroaatar application to tha aaatucaHant of tha p/antl-p • in dlffaranca PS190 " * *•• WA«O and NA35 PS1S1 Coaplatad S»»reh for dacayt of haavy Athans Daaokrltot Vannuccl. F. nautrlnot with tha PB baaa CERN Parlt. LPNHE. P. at M.Curia Univ. PB192 Coaplatad Study of tha anargy Frankfurt/Maln Univ. FrI ad Iandar, E.M. dapandanca of tha anoaalout Lawranca Barkalay Lab. aaan fraa path affact by Marburg Univ. aaant of hlgh-anargy C> or • 12 GaV/nuclaon) ha I Iua nuc tal P6193 Coaplatad Study of tha nuclaar Banarat Univ. Ottarlund. I. trantparancy In alpha** Cairo Univ. raaetlont at anarglat largar Chandigarh. Punjab Univ. or aqual 12 CaV/nucDaon Jaipur. Rajatthan Univ. JlDtv Un) v. Lund Uni v. PS19* Praparatlon Maaturaaantt of -tha ratio Mrhm Univ. UggarhoJ* C. batwaan doubla and 11ngI a CERN Ionisation of hallua Btockhola Rat. Intt. for ant I protons PS195 Praparatlon Ta«t of CP Violation Athant Daaokrltot Pavlopoulo*. P. with KCzero] and antl-KCzero) Batal Univ. Bt LEAR CERN Fr I bourg Uni v. LI varpool Uni v. Baclay CEN DPhPE S. I. N. Btoekhola Rat. Intt. Thaitalonlki Univ. 2vrl eh E. T. H. T209 CoNp:?4ad A larga ttatlttlct K-p Blralnghaa Univ. Buarclgh. E. axpotura at s. S>s Gav/e CERN In tha S a HBC Clatgow Univ. Palaltaau Ec.Poly. L. P. N. H. E. Ml chl gan Btata Uni v. Tail withdrawn K-n Intaractlont In tha c. a. Blralnghaa Univ. Cox. CF. anargy ragisn around 1 CaV and around 2 CaV T227 Coaplatad Study of hyparcharga axchanga Bargan Uhlv. DIBX. J. raactlont and ratonanca CERN propartlat In PI- p Intaract- Parlt Collaga da Franca I ont at H- C«V/c In tha 2 a Palaltaau Ee.Poly. L. P. N. H. E. bubble chaabar Madrid J. E.N. Stockholm Univ. T23& Withdrawn Study of K-p Intaractlont London. laparSal Coltaga Ron, R.T. batwaan H-SO and 900 MaV/c Rutharford Applaton Lab. TaS7 Coaplatad High ttatlttlct antiproton- Athant Univ. Mulrhaad. H. proton axparlaant» Athant Oaaokrltot •t 7.3 CaV/c Athent Nat. Tach. Univ. LI varpool Uni v. Vlann* Akad, Wlttantch. 1839 Coaplatad A high «tatlttlët Mgh CERN " Critt"~M ratoiutlon aaaturaaant of tha Roaa C. N. E. N. total and partial antl-p p Padova Uniw. croit «action» batvaan 1900 Roua Univ. and 19SS Mav total c.m. anargy Trlattc Univ. Ta»* Ccapldtad Aht I proton-dautarl un Intar- Haltlnkl Uni». "*"**""""Êîît»onir*B*""""*" actions at la CaV/c «toekhola Univ. ^»n». ». •tratbourg Univ. •»»S8 Coaplatad A high ttatlttlc* hlgii CERN " * * " * " ****Cr»»*îT'A"* resolution aaaturaaant af tha Roaa C. N. E. N. -rw.T... „. total and partial antl-p <• Padovc Uhl v. cresc •actions batwean 1900 Reno Univ. and 19SS Maw total CM. Trlatta Univ. . anargy •S*l c«aplataa iaaturaaant ef tna~ÏIÎ/â tô ÔÊÂN * *" *" "iiwiJiTM T'Ê"*"" t»3/a mamrmr «I ff aranca I it *ha Pita Univ./INFN "' *• • ua Ha* auontc I on by aaant •f • tunaala dya latar •CSS Co»»3»tnd Nuclaar crass tact)ont Orsay C•.N.•.M. •-•-••---•-----•»•«---.----»..... of (title ray Intarait TI«». r. 293 EXP. STATUS EXP.TITLE INSTITUTES SPOKESMAN SCS2 Coiplaitd Mtaiuroint of average Oa I o Univ. Hagebo. E. Intrgltti forward MONCnia and • nl lotrctln of specific «I III or products fro* tllllon of I«ad Inducad by SOD MeV P r ot ont SC53 Coaplated Study of products of binary Lund Univ. Bchroder» B. fission In dl ll niagri-tl am of Olio Univ. U,P6,Pr,»a,6r and Cu by 6O0 M«V protein BOSS Coaplatad A study of partiel* «uliilon Karltruha Univ. Ullrich. H. Induced In -th« absorption of CERN •topptd PI- In oxygtnClE) and othir pa ha I I nueI a I SCS7 Coaplatad Hadron biology: I n vaa t I gat I on CERN Baarll. J. of tha a urvlva I of t peraatogonl a typa b In nice limaitlgatloii of tha Inhibition of tan days g r owth of vlela faba roota SCSS Coaplttta Production of 10m u>-2t OaIo Univ. Hagebo. E. from uranlua at I nta mad I ata and low proton energies 8CS9 Coxplatad Praelalon aaaturaMantt of tha Louvaln Cath. Univ. Dfutich. J.P. partial «non captura rata llthlua-6 • hellua-6 g.t. ECBO Coapleted Baarch for a naw aode of Louvaln Cath. Univ. Diutich, J.P. capture In nuclei VI- * a • b • 2 sennas SCB3 Coxplatad Elastic «cat-taring of au p and Bologna Univ. Bartlr. A. au d auonlc atom agalnat protons and dautarons SC6* Coapleted Taats for fast •operations Damstadt TH Bachaann. K. of nuclaar raactlon products 6CS5 Data-Taking Local aagnatlc fields In CERN Karlsson. E. ferr&»agnetIcs studlad by Grenoble. I.S.N. positiva au on pracassfon Upvialt Univ. BCee Coaplatad Installation of tha Aastardasi I.K.O. Mlchaalls. E.G. OMICRON spectroneter Aastardu» Vrlje Univ. Bl ml nghaa Univ. CERN LJubIJana Uni v. Oxford Uni v. Tor I no Univ. 6C67 Coaplatad Plon absorption on nuclal Basal Univ. Tautcher. L. Kar I sruha Uni v. StockholM Uni v. BCS8 Data-Taking Muonlc cheatstry In condansad Parae Univ. Buccl> C. •attar 6C69 Coaplatad Study of auonlc and plonlc Darasbury Lab. Bal lay. J. X-rays In H2. 02 and Has- Malm Univ. Vancouver Univ. BC70 Coaplatad étudiai of fission of haavy CERN Pollkenov. B.M. nuclal Inducad by auont Oslo Univ. Warsaw Inst.NucI.Ras. EC71 Coaplatad Study of tha absorption of Trlasta Univ. Cernlaol. C. PI- at rest In hallo»-*, berylllua-9< carbon-12. nltrogen-1* BC72 Coaplatad Further studies of lens CERN Baarll. J. opacl f I cat I on In nice after Roate C. N. E. N. exposure to 60D MaV neu-fcrons SC73 Coapleted PI backward scattering Aatterdaa I.K.O. Dallacaaa. C. on nuclal Aastardasi Vrlje Univ. • I ral njjhaa Uni v. CERN Ljubljana Univ. Oxford Uni v. Tor I no Uni v. EC7» Coaplated Maaauraaant of tha population Plaa Unlv./INFN Toralll. C * and llfatlae of tha 2s state In auonlc hydrogen 6CTS Coaplatad Search for PI •- and K* Cagllarl Univ. AalanlOes. C aasons with the 3Ha bean Btrasboure Univ. at tha CERN EC Torino Univ. «C76 Oata-Taklna lapurlty trapping of positiva CERN Karlssan. £""" auons In Betels Geneva Univ. Oui Ich KFA Uppsala Uni v. 8CTT Ceapletea Daterai nat I on ef tha branching Aasterdaa VrIJa Univ. Oavlës. 5*0*"" ratio for the eecey PIU • a*e- «Iralnghaa Univ. Cagllarl Univ. CERN Oelft Tech. Univ. Ljubljana Univ. Manitoba Univ. Oxfora Univ. Tari ne Uni v. Rutherford Appleton Lab. 294 EXP. STATUS EXP. TITLE INSTITUTES SPOKESMAN SC7S Coapleted Radl ob I o I 091 ca I •xpirlatn-ti CERN Bairll. J. using the SC 6D0 Mev Ron* C. N. E. N. muiron beaa Mtnchutt^ Univ. BC79 CoipKtfd Btudles of binary (Itilon of Lund Univ. Schroder. B. light nuclei Induced by Oslo Univ. 600 MeV proton» BCBO Coapleted Measureaent of -tha Aasterdaa I.K.O. Konljn. J. «ubdrupola aoaan-t In C1853R» «>ittrd» VrIJa Univ. and C187)Ro froa pionlc and CERN auenlc X-ray» Kingston Quaant Univ. S-tockhola Uni v. SCSI Da-ta-Tak I ng Formation and Interaction of Paraa Univ. Buccl. C. auonlua In Insulators and Rutherford Appleton Lab. «••I conductors SCS2 Ceapleted auSR In organic and fraa CERN Stirling. C. C. radical chealttry Paraa Univ. Rutherford Appleton Lab. 6C83 Data-Taking Study of the partiel» Btrjtn Univ. Ryda. H. production In 86 MeV/N Copenhagen Niels Bohr Inst. ISC Induced heavy Ion Grenoble. C.E.N. reaction* Grenoble. I.6.N. Lund Uni v. Sedey CEN DPhN 6CBt Coaplated Use of 12C projectiles at Orsay I. P. N. Gal In. J. energies up to SB MeV/N for studying the dlsslpatlve phenoaena In nuclear col I I11 on* j GC8S Data-Taking Element distribution and Deraitadt GSI Lynen. V. aultlpllclty of heavy Heidelberg MPI I fragaentt Mun*ter Univ. 1 SC86 Coapleted Study of nuclear col I I tl on* Bordeaux Univ. Fleury. A. of SS Mev/H Carbon-ia with 1 heavy target* by collection of the heavy recoil nuclei ) SC87 Date-Taking Study of target fragaentatI on U.C. Berkeley Aleklatt, K. In the Interaction of 86 MeV/A Oregon Univ. 12 carbon with tantalua. Btudavlk Bel.Re*.Lab. blsauth. and uranlua SCB8 Completed Study of reaction aechanlta Grenoble. C.E. N. Blachot. J. In the Interaction of Grenoble. I.8.N. B6 MevVA lSCarbon with Lyon Univ. heavy target* SCB9 CoMpleted On-line Mil •pactroaetrIc Oraay C. S. N. S. M. De Salnt-Slaon. M. •tudy of heavy ten Induced Or«ay I.P.N. reaction* at énergie* up to «6 MeV/aau BC90 Coapleted Study of the plon production Cagliarl Univ. Bre**anl. T. aechanltas In nucI eus - nue I eu* CERN collision* at the CERN EC Strasbourg Univ. tiling the Oalcron Torino Univ. Bpectroaeter SC91 Coapleted Meatureaent of total reaction Grenoble. I.S.N. Longequeue. N. cro«* -tectI ont with Grenoble. CEN heavy I ant at tha synchro-cycIotron 6C92 Data-Taking Bubthreshold production of Darnttadt GSI Grè*se. E. neutral plon* In heavy Ion Oara«tadt TH colllilon* Frankfurt/Main Univ. SC93 Data-Taking au-SR aea*uraaent* under Grenoble, C.E.N. Kalviut. G M high pretture and at Munich TU low température* Uppsala Univ. 6C9* Coapleted Study of the production A«tterde« Vi-IJ» Univ. Kernel. C. of tingle plon* In Bl ral ngheni Univ. plon-proton colIliloni CERN near threshold Delft Tech. Univ. LJublJane Univ. Oxford Univ. RC9S Date-Taking Muonl and auonlua In CERN Syaon*. M. C.R. aoleculer phytlct Leicester Univ. Rutherford Appleton Lab. 'SC96 ' Coapleted BOO Mev «laulatlon of the Ahaedabad. PRL Michel. R. production of cotaogcnle Bordeaux Univ. nucliee* In aeteorltet Cologne Univ. by galactic protons Jullch KFA Mal ni MPI Zurl ch E. T. H. ISOLDE Oata-Taklng Iiol«t prograaae CERN Thlkault. C. Isolde Collaboration 1610 Eate-Tak1ng Daterai nat I on of the Aarhu» Univ. Jonson. B. electron neutrino na.it CERN fro« experlaents on Isolde Collaboration electron-capture Luna Univ. beta-decay CEO Roskllde. Taadea Accelerator 2120 Dat»-Teklng Mces*bauer studies of Aarhut Univ. Weyer. C. laplante« lapurltlet Gronlngen Univ. In toiie» Isolde Collaboration EXP. STATUS EXP.TITLE INSTITUTES SPOKESMAN IG30 Dit.-Tiklni PAC exporIaentt at ISOLDE Btrlln(W) HMI Has», H BarI I n(V) FU BarllnCIO TU Isolde Collaboration 16*0 Dati-Tikl nj ABMR ixrirlafnti at ISOLDE Gothenburg Univ. Ekstroa. C. Isolda Col I «bora-t I on 3S50 Conplated Bpectroscop Ic studies of Lyon Unix. Knlppar. A exotic nuclei at ISOLDE Madrid J. E. N. Paris, IN2P3 Strasbourg Univ. Isolda Collaboration I860 COB» la-tad Continuation of •••• Orsay C. S. N. S. M. Epnerre, M data m I nattons through a Isolda Collaboration doubla focusing aass spactroaatar on I I no with ISOLDE 1670 Coaplatad Continuation of atoale Orsay C.S.N.S.M. Thibault. C spactroscopy on alkali Orsay, AI Ma Cotton Lab. Isotopas at ISOLDE Isolda Collaboration IS«0 Data-Taking Study of nuclaar aoaants and Mainz Univ. Neugart. A. • «•n-Mutrt charge radii Boabay, Bhabha Ateal c Ras.Cantra by colllnaar fast-baa» CERN luar spactroscopy Cothanburg Univ. New Vork Uni v. Isolda Collaboration laai Data-Taking Lasar spactroscopy at Z'SO CERN Hubar. C. Darastadt CSI Mal nx Univ. Isolda Collaboration ISS2 Praparatl on Multlphoton lonlxatlon CERN Ottan, E. W. detection In colllnaar lasar Mainz Univ. spactroscopy of ISOLDE baaas Troltik, Inst. of Spactroscopy Isolda Collaboration IB90 Coaplatad Studlas of tha doub I y-c I osad Bergen Univ. Bloaejvltt, J. shall nuclaut 132-Sn CERN and 1st valanca nuclal Isolda Collaboration Darastadt CSI Gothanburg Univ. Ju I I eh KFA Kingston OJueens Univ. Btockhola Ras. Inst. IB1Û0 Data-Taking Studlas of stabla Bargan Univ. Lovholdan, C. octupola daforaatlont CERN In tha radlua raglon Chalaars Unlv of Technology Mal nz Uni v. Warsaw Uni v. Isolda Collaboration IS110 Data-Taking Nuclaar orientation studlas CERN Calaprlco. F. P. and aeasureaents of aagnatlc Kingston Quean» Univ. aoaants of radon Isotopes Mainz Univ. Prl ncaton Uni v. Zurl en E. T. H. Isolde Collaboration 18120 Preparation Nuclear Implantation Into Bonn Univ. Stone. N. J. Cold On Line Ee.ulpaent CERN Darasbury Lab. Delft Tech. Uni v. Bant. State Uni v. Louvaln Cath. Univ. Lyon Uni v. Munich TU Orsay C. •. M. S. M. Oxford Uni». Paris. IN2P3 atrasbourg/C. R. N. Isold* Collaboration IB130 Preparation HIgh-precls I on direct CCRN Kluge. H. -J. •ass detaralnatlon Mains Univ. of unstable Isotopes Montreal McCI I I Univ. Isolde Collaboration «LEPH Preparation Tha ALCPH Detector Athens DeaokMtot Stel neerger, j. •arl Uni v. Beijing H. C. P. Inst. CERN Cleraont-Ferrand Univ. Copenhagen Niels Bohr Znst. Dertaund Uni v. Cdl neurgh Uni v. Florida State Univ. Frascatl Nat.Lab. tINFN) Glasgow uni v. Heidelberg Uni ». Innsbruck Univ. Lancaster Uni v. Landen, leper Ial Callage Martel I la C. P. P. M. Munich MPI Orsay Linear Dec. La*. CLAD Pelalaeau Cc.Pely. ... P. N. H. e. •lea Univ. /INF* Rayai Helleway Cellega. Eghea Rutherford Appletan Lab. tac lay CKN DPhPt Sheffield Univ. ll«|*n OHB Trieste Univ. Ml scans In Uni». EXP. STATUS EXP. TITLE INSTITUTES SPOKESMAN OPAL Praperatl on OPAL Collaboration LEP Bl ml nghaa Uni v. Ml ehal I nl . A. Bol egna Uni v. Bonn Uni w. Caabrl dge Uni v. Car la-ten Uni v. CEKN Chi ctfo Uni v. Frai burg Uni v. Hal da Ibarg Uni v. Itrltl Imi. Taeh. London» Blrkback College London» Queen Mary College London» Uni vcrdiy College Manchester Univ. Maryland Uni ». Ottawa Mat. Res. Councl I Rehovoth UiliMnn Init. Rutherford Appleton Lab. Baelay CEN DPhPE Tel-Avl v Uni v. Tokyo Uni v. L3 Preparation L3 Collaboration LEP Aachen TH, X Phyt.Xnst. Tl ng» S. C. C. Aachen TH, III Phys.Xntt. AatterdaM NIKHEF Annecy L. A. P. P. Bel Jl ng H. E. P. Intt. Boabay. Tata Ins*. Budapact Ret. Intt. CaI tech Carnegle-MeI I on Unix. CERN EIR WuerenI Ingen FI orence Uni v. Fratcatl Nat.Lab. CINFN) Geneva Un) v. Harvard Uni v. Hawal I Unl v. Hotel 6clence and Tech. Univ. John HopkIns Uni v. Lausanne Univ. Lund Uni v. Lyon Unl v. Medrl d J. E. N. Ml ehi gan Uni v. M. I. T. Moscow I. T. E. P. Nap let Univ. /INFN Northeastern Univ. Ohl o State Uni v. Ok lahoaa Uni v. Prl nceton Un! w. Horn» Uni v. Slegen CHS Va le Uni v. 2eut»en Intt.H.En.Phyt. Zurl ch E. T. H. DELPHI Preparetlon DELPHI Collaboration Aaas Lab. Aaaldl, U. Aasterdaa NIKHEF Athens Univ. Athens Nat. Tech. Univ. Belglua {DELPHI? Bergan Uni v. Bologna INFN CERN Copenhagen Niels Bohr Inst. Cracow Intt.NucI.Phy». Oubna J. I. N. R. Genova Uni«. /INFN He I sinkl Uni v. Karlsruhe KfK LI verpool Uni v. Lund Uni v. Ml Ian Uni v. /INFN Orsay Linear Ace. Lab. CLAD Of lo Uni v. Oxford Univ. Padova Univ. Paris Colleta de France Pari», LPNHE, P. et M. Curie Univ. Roaa. Banlta/XNFN Rutherford Appleton Lab. Bac lav CEN DPhPE Bantanaar Univ. Berpukhov I. H. E. P. BtockholM Univ. Strasbourg Uni v. Tori no Uni v. /INFN Trieste Uni v. Uppsala Uni v. Valancl a Uni v. Vienna Akee\ Wlttentch. Warsaw Ins*. Nuc I. Rat. Wupperta I Uni v. EMU01 Preparation Study of particle production Bel Jl ng H. E. P. Xntt. Otterlund. X. and nuclear fragmentation In Jaipur. Rajasthan Univ. call I tiens of C1S3O baaas ilsssv Uni v. with eaulslan nuclei Lawrence Berkeley tab. a* U-tOO A Cev Lund Uni v. Ottawa Nat.Res.CounclI Ottawa Uni v. Bhanxl Noraal Univ. Tashkent. LHEP Phys.Tech.Inst. Washington Univ. Seattle Wuhan» Hua-Zhong Noraal Univ. Préparât!en Search far fractionally U.C. Berkeley • rlee. P. B. chart*' nuclal In hlth-enerfV eCKN oxyton-I«ad collisions CHU03 Preparation Interactions of Caire Uni v. Badawy. O. C. C1CJO projectile end It* fretaentt In nuclaar eaulslan at about SO and 111 DaV/n 297 f f f ?