DEPARTMENT OF COSMIC RAY PHYSICS 121

7.8 ZEUS Experiment by P.Plucifiski PLO201875

The Hadron-Electron-Ring-Accelerator (HERA) component of the Zeus detector) was implemented to allows for collisions between electrons of energy 27.5 determine tracks of muons passing through the GeV and protons of energy (after upgrade) 920 GeV. detector and to measure the energies of particles the The Zeus detector is built in the south hall of which are not absorbed in uranium calorimeter. HERA. Its dimensions are 12xl)Oxl9m. The The main subject of our work in DESY is the experiment is focused on studying the structure of trigger system of the BAC calorimeter. Mainly, we are protons. The BAcking Calorimeter (BAC as preparing codes (in Occam) for trigger electronics.

7.9 The Underground Muon Telescope by JGawin, J.Karczmarczyk, .J.Swarzyhski, B.Szabelska, J.Szabelski, P.Tokarski and T.Wibig = D _ - The underground muon telescope of 0.5 m2 area can be correlated with the Forbush decreases of low = - 0 has registered the flux of muons with energies above 5 energy cosmic rays registered in the neutron monitors. cj GeV almost permanently in the year 2001. These From the comparison of our results with other muons are produced in the Earth's atmosphere by measurements of primary cosmic ray decreases it primary cosmic rays that are modulated by solar comes out that some geomagnetic disturbances can phenomena. We performed simulations of muon modulate the flux of primary cosmic ray particles with production in the atmosphere and determined the energies above 50 GeV. We have also started distribution of energy of primary cosmic rays registrations of the muon count rate in the on-surface responsible for muons registered in our telescope. detectors of the air shower array. These measurements These energies are in the range from 10 to 50000 GeV will be included to the analysis of the disturbed energy (median energy around 120 GeV). We have also spectrum of primary cosmic rays. determined the so-called barometric coefficient, which We are working on the project of a large is equal to - 0.0006/mb. underground muon telescope of 40 m2 area, in which The Sun is now in the state of maximum activity. the main detecting elements will be the scintillator It was very active last year and the resulting strips used in the MINOS experiment and multipixel geomagnetic disturbances had various amplitudes. We photo-multipliers. have registered a few decreases of the muon flux that

Forbush Decrease registration

< 1 - 5 GeV muons.

0.96

0.984 ground level muons 0.92 _

0.9 neutron monitor Apatity

0.88 ...... 29 Oct 31 Oct 02Nov 04 Nov 06 Nov 08 Nov 10 Nov

Fig. 1 Example of cosmic ray intensity variation. Forbush Decrease of the 6"' November 2001 registered as: - 9% change in neutron flux in the Apatity Neutron Monitor (www.kolasc.net.ru/cosmicRay/) (corresponding CR energy about 2 GCV) - 3.5 % change in tie Coonltin1g rate of Lodd air shower array surface scintillation detectors (primary CR energy 10 - 50 GeV), - about 2% decrease of 5 GcV muon rate registered in the underground muon telescope (primary CR energy 20-100GeV). 122 Annual Report 2001

LIST OF PUBLICATIONS

ELECTRON, MUON. AND HADRON LATERAL DISTRIBUTIONS MEASURED IN AIR SHOWERS BY THE KASCADE EXPERIMENT. T.Antoni,..., J.Zabierowski, et al. (KASCADE Coil.) Astropart. Physics 14 (2001) 245-260

TIME STRUCTURE OF THE EXTENSIVE AIR SHOWER MUON COMPONENT MEASURED BY THE KASCADE EXPERIMENT T.Antoni--..., J.Zabierowski, et al. (KASCADE Col].) Astropart. Physics 15 (2001) 149-165

HIGH ENERGY COSMIC RAYS IN THE LOW STRATOSPHERE AND EXTRAPOLATION ABOVE LHC ENERGIES J.N.Capdevielle, F.Cohen, I.Kurp, C.Lc Gall. B.Szabelska, ..Szabelski 11 Nuovo Cimento C 024C, issue 0405 (2001) 531-538

COSMIC RAY PHYSICS AROUND THE KNEE WITH KASCADE EXPERIMENT A.Haungs-.--- J.Zabierowski, et al. (KASCADE Coil.) IL Nuovo Cintento C 024C, issue 0405 (2001) 599-606

LATERAL DISTRIBUTIONS, LOCALISATION METHODS, (600), SIZE AND ENERGY DETERMINATION IN GIA'IT EAS J.N.Capdevielle, C.Le Gall, J.Gawin, I.Kurp, M.Matraszck, B.Szabelska, J.Szabelski and T.Wibig Nuclear Physics B (Proc. Suppl.) 97(2001) 223-226

RECENT RESULTS OF KASCADE - PHENOMENOLOGY OF EXTENSIVE AIR SHOWERS G.Schatz._ J.Zabicrowski, et al. (KASCADE Coil.) Nucl.Phys.B (Proc.Sup1pl) 97(2001) 93-96

TOWARDS ENERGY SPECTRUM AND COMPOSITION OF PRIMARY COSMIC RAYS IN THE KNEE REGION: METHODS AND RESULTS AT KASCADE A.Haungs, ..., J.Zabicrowski, et al. (KASCADE Coil.) Nucl.Pi..YB (Proc.Suppl/) 97 (2001) 97-100

TEST AND ANALYSIS OF HADRONIC INTERACTION MODELS WITH KASCADE EVENT RATES M.Risse, ..., J.Zabicrowski, et al. (KASCADE Coll.) Nucl.Ph~vs.B (Pioc.Soppl) 97 (2001) 101-104

CROSS SECTION OF THE pp--> pp pizero REACTION BETWEEN 310 AND 425 MeV R.Bilger, ..., J.Stepaniak, J.Zabierowski, et al. Nucl.Pkvs.A 693 (2001) 633- 662

SPECTATOR TAGGING IN QUASI-FREE PROTON-NEUTRON INTERACTIONS IN DEUTERIUM USING AN INTE ZNAL CLUSTER-JET TARGET IN A STORAGE RING R.Bilger,.-..,-A.Kupge, I'.Marciniewski, J.Stepaniak, J.Zabierowski, et al. Nucl. Iustr. and Met/i. A 457 (2001) 64-74

STUDY OF THE EFFECTIVE TRANSVERSE MOMENTUM OF PARTONS IN THE PROTON USING PROMPT PHO'ONS IN PHOTOPRODUCTION AT HERA S.Chekanov, ..., P.Plucifiski, et al. (ZEUS Collaboration) Physics Letters B 51/ (2001) /9-32

MULTIPLICITY MOMENTS IN DEEP INELASTIC SCATTERING AT HERA S.Chekanov, ..., P.Pluciiski, et al. (ZEUS Collaboration) Physics Letters B 510 (2001) 36-54

THREE-JET PRODUCTION IN DIFFRACTIVE DEEP INELASTIC SCATTERING AT HERA S.Chekanov, ..., P.Plucifiski, et al. (ZEUS Collaboration) Phlv sic s Letters B 516 (2001) 273-292

MEASUREMENT OF THE NEUTRAL CURRENT CROSS SECTION AND F 2 STRUCTURE FUNCTION FOR DEEP INELASTIC EP SCATTERING AT HERA S.Chekanov-..., P.Plucinski, et al. (ZEUS Collaboration) The European Physical Journal C 21 (2001) 443-471

NABLYUDENIE SIGNALOV, ZAPAZDYWAYUSZCZIH NA 500-2000 ,us OTNOSITELNO FRONTA SzAL. J.Gawin, S.Pachala, W.W.Poddubny, J.Swarzvinski, B.Szabelska, J.Szabelski, T.Wibig, A.F.Yanin kziviestia RosxjskiejAkadenfii Nauk. Serija Fizicheskaja 65 (2001) 1194-1195

PROSPECTS FOR EXTRAGALACTIC PARTICLES FROM EXOTIC PROCESSES T.Wihig and A. W.Wolfendale J. Phys. C 27 (2001) 1625 DEPARTMENT OF COSMIC RAY PHYSICS 123

HIGH ENERGY INTERACTIONS AROUND THE KNEE T.Wibig J. Phys. G 27(2001) 1633

TEST OF HADRONIC INTERACTION MODELS IN THE FORWARD REGION WITH KASCADE EVENT RATES T.Antoni,..., J.Zabicrowski, et al. (KASCADE Coll.) J. Phys. G. Nucl.Part.Plhv.s. 27 (2001) /785 -1798

A UNIVERSAL ORIGIN FOR COSMIC RAYS ABOVE 107 GEV? A.D.Erlykin, T.Wibig and A.W.Woltendale New Journal of Phys.vics 3 (2001)18.1

PIATA SILA ,,ARS LONGA, VITA BREVIS" T.Wihig, Acta Uni. Lodc., Folia Physica 24 (2001) 3

COSMIC RAYS OF THE HIGHEST ENERGIES: THE CASE FOR EXTRAGALACTIC HEAVY NUCLEI J.Szabelski, T.Wibig and A.W. Wollendale Astroparticle Pli'sics.(in press)

FRONT-END READOUT BOARDS FOR STREAMER TUBE MUON TRACKING DETECTOR IN THE KASCADE EAS EXPER IMENT J.Zabicrowski and P.Doll Nuel. Instr. and Meth A. (in pre vs)

DIUET PRODUCTION IN NEUTRAL CURRENT DEEP INELASTIC SCATTERING AT HERA S.Chekanov, .-- P.Plucifiski, et al. (ZEUS Collaboration) The Eu ropeasn Physical Journmal (ill piess)

PROPERTIES OF HADRONIC FINAL STATES IN DIFFRACTIVE DEEP INELASTIC SCATTERING AT HERA S.Chekanov,..., P.Pluciiiski, et al. (ZEUS Collaboration) Phys. Rev. D (in press)

REPORTS

ESTIMATION OF THE TRIGGER DISTRIBUTION DELAYS IN THE KASCADE- GRANDE EXPERIMENT J .Zabicrowski Forscelinotgszeiitrumi Karil.vsuhle. Interner Beric/it KASCADE-2/2001-02 51.02.03

PARTICIPATION IN CONFERENCE AND WORKSHOPS

invited talks

THE CELSIUS-WASA DETECTOR FACILITY J.Zahicrowski for CELSIUS/WASA collab. Workshop on Eta Physics. Upp.sala. Szwec a. 25-27.10.2001

PION PRODUCTION IN pN COLLISIONS NEAR THRESHOLD J.Zlomanczuk-..., J.Stepaniak,..., J.Zabicrowski et al. AIP Con/S: Proc., Dec.2001, V,,o.603. 21, Mesons anid Light Nuclei: 8"'Conf 2001, Prague, Czech Republik, ed. hy J1Adams et al.

oral talks

HIGH ENERGY COSMIC GAMMA RAY REGISTRATION (FROM MEV TO 100 TEV) J.Szabelski 11'"International School ,,Pa r-ticle.s and Cosmology Baksan Volle', Kabardino-Balkaria, Russian Federation, April 18-24 2001

HADRONIC COLLISIONS AT VERY HIGH ENERGY I.Kurp 1/"' International Sclhool ,,Par-tic/les and Cos.vnologi", Baksani Valley, Kabardino-Balkaria, Russian Federation, April 18-24 2001

ASTROPHYSICAL REGISTRATION OF SIGNALS COMING 500-1000 MICROSECONDS AFTER THE MAIN EAS FRONT J.Gawin, K.J~di-zcjczak, J.Karczrnarczyk, S.Pachala, J.Swarzyiiski, B.Szabelska, .I.Szahelski, T.Wibig, A.F.Yanin et al. 27"' ICRC, Hamiburg, Geiniany, 8-15 .4ugust 2001

PRIMARY ENERGY DETERMINATION OF UHE EVENTS FROM PUBLISHED VOLCANO RANCH, YAKUTSK AND AGASA DATA J.N.Capdevielle, F.Colien, C.Le Gall, ,.Gawin, I.Kurp, B.Szabelska, .I.Szahelski, and T.Wibig 27" ICRC, Hamibuig, Gerpnany, 8-15 August 2001

THE PRIMARY ENERGY SPECTRUM OF COSMIC RAYS OBTAINED BY MUON DENSITY MEASUREMENTS AT KASCADE A.Haungs, . J.Zabierowski et al. (The KASCADE Collaboration) 27"' CRC, Hamiburg, Germany, R-15AIu.gut 2001 124 Annual Report 2001

NONPARAMETRIC DETERMINATION OF ENERGY SPECTRA AND MASS COMPOSITION OF PRIMARY COSMIC RAYS FOR SLANT DEPTH M.Roth, .. J.Zabierowski et al. (The KASCADE Collaboration) 27" ICRC, Hamnburg, Germany, 8-15 August 2001

A MEASUREMENT OF THE PRIMARY COSMIC RAY ENERGY SPECTRUM USING THE HADRONIC AIR SHOWER COMPONENT J.Hoerandel, ..., J.Zabierowski et al. (The KASCADE Collaboration) 271' ICRC, Hantbur,'g. Germany, 8-15 August 2001

HADRONIC INTERACTION MODELS AND THE AIR SHOWER SIMULATION PROGRAM D.Heck, ..., J.Zabierowski et al. (The KASCADE Collaboration) 27" ICRC, Hamburg, Gernmawn, 8-15 August 2001

KASCADE-GRANDE: A CONCLUSIVE EXPERIMENT ON THE KNEE M.Bertaina,..., J.Zabicrowski et al. (The KASCADE Collaboration) 27"` ICRC. Hamndburg, Germany, 8-15 August 2001

TEST OF HADRONIC INTERACTION MODELS WITH THE KASCADE HADRON CALORIMETER J.Milke,..., J.Zabierowski et al. (The KASCADE Collaboration) 27" ICRC, Hanburg, Germnazly. 8-15 Augusti 2001

PRIMARY ENERGY SPECTRA OF COSMIC RAYS SELECTED BY MASS GROUPS IN THE KNEE REGION H.Ulrich, ..., J.Zahierowski et al. (The KASCADE Collaboration) 27" ICRC, Hamburg. Germany, R-15 August 2001

MULTIPLE PRODUCTION, TRANSPORT IN ATMOSPHERE AND DETECTION OF HIGH ENERGY COSMIC RAYS J.N.Capdevielle, F.Cohen. C.Le Gall. I.Kurp, B.Szabelska, J.Szabelski 31" Int. Svnp. o01Multiparticle Dvnat7iaic.s, Datong. China, 1-7 Sept. 2001

THE ROLAND MAZE PROJECT J.Gawin, I.Kurp, K.Jcdrzcjczak, P.Plucinski, B.Szahelska, J.Szabelski, and T.Wihig 27' Mazurian Lakes School of Phyzsics. Kr~-ye. 2-9 Sept. 2001

GLOBAL TRIGGER SYSTEM OF THE ZEUS EXPERIMENT P.Piticifiski Wilga. Poland. 26-28 May 2001

UNTERSUCHUNG ZUR VERBESSERUNG DER WINKELAUFLOSUNG DES MYONENSPURDETEKTORS IN KASCADE- EXPER IMENT R.Obenland, C.Biittner, K.Daumiller, P.Doll, K.-H.Kampert, D.Frey, I.Martello, J.Zabierowski Verhmdlingen7 derDeulivc17en Ph-,sikalis17leui Gesellschafl, Fri-ljahrstagungBonn 2001, T201.7, 36 (only abstracts are published)

PRODUKTIONSHOHENBESTIMMUNG VON MYONEN MIT DEM MYONSPURDETEKTOR DES KASCADE- EXPERIMENTE C.Buttner. K.Daumiller. P.Doll, K.-H.Kampert, D.Frey, D.Martello, R.Obenland, J.Zahierowski Verlhandlungen der Deutschetn Physikalischen GesellschaftB FtiihjahrstagungBmnt 2001, T 201.8, 37 (only abstractsmre 1pli.tlsed)

EXCLUSIVE MEASUREMENT OF THE pp --> pp 7ran- REACTION CLOSE TO THRESHOLD W.Brodowski, ..., J.Stepaniak, ..., J.Zabicrowski et al. AIP Canf. Proc., Dec.2001, Vol.603 ,p.503. Mesons and Light Nuclei: 8"'Conf: 2001, Prague, Czech Republik. ed. by J.Adanms el al.

SOME FEATURES OF THE pd-->ppn 7" REACTION AT 1.037 GeV J.Stepaniak, ..., J.Zabierowski et al. AIP Conf: Proc.. Dec.2001, Vol.603. p.531. Mesons ajud Light Nuclei: R'"Conf 2001, Prague, Czech Republik. ed. by J.Adatns etal.

posters

NEGATIVE EXCESS IN THE ELECTROMAGNETIC COMPONENT OF GAS AND THE RADIO EMISSION J.N.Capdevielle, F.Cohen, C.Le Gall. .IGawin, I.Kurp, B.Szabelska, .I.Szabelski, and K.Sanosyan 27" ICRC, Hamburg, Gertmaty, 8-15 August 2001

FLUCTUATIONS OF PARTICLE DENSITY IN GIANT AIR SHOWERS J.N.Capdevielle, F.Cohen, C.Le Gall, J.Gawin, I.Kurp, B.Szabelska, J.Szabelski, and T.Wibig 27" ICRC, Hattburg. Getnmanyv, 8-15 August 2001

THE HYPERGEOMETRIC FORMALISM FOR THE LATERAL DISTRIBUTION OF CHARGED PARTICLES IN EAS J.N.Capdevielle, F.Cohen, C.Le Gall, J.Gawin, I.Kurp, B.Szabelska, J.Szabelski, and T.Wibig 27" ICRC, Hatnburg, Get-many, 8-15 August 2001

THE SMALL MUON TELESCOPE FOR 5 GEV MUON FLUX REGISTRATION IN THE UNDERGROUND LABORATORY IN LODZ J.Gawin, J.Karczmarczyk, J.Swarzyfiski, B.Szabelska, J.Szabelski, P.Tokarski, and T.Wibig 27" ICRC. Hamburg, Gertanly, 8-15 August 2001 DEPARTMENT OF COSMIC RAY PHYSICS 125

FORBUSH DECREASES OBSERVED AT TH-IE LEVEL OF 25 M.W.E. IN THE UNDERGROUND DETECTOR IN LODZ B.Szabelska, .. Szahelski, T.Wihig, and M.V.Alania 27" ICRC, Haiiibiur ', Gernmany. 8-15 Auj,'ust 2001

NON-EXTENSIVITY IN HADRONIC INTERACTIONS AT HIGH ENERGIES I.Kurp and T.Wihig, 27"' ICRC, Hamiburg, Germany. 8-15 August 2001

COSMIC RAYS FROM DARK MATTER HALOS'? T.Wibig and A.W.Wolfendale 27"ICRC, Hamburg, Gerany, 8-15 Aupist 2001

THE PROPAGATION OF ULTRA-HIGH ENERGY COSMIC RAYS T.Wibig and A.W.Wolfendale, 27" ICRC, Haniburg, Germanly, 8-15 August 2001

LARGE MUON TRACKING DETECTOR IN THE KASCADE EAS EXPERIMENT J.Zabierowski et al. (The KASCADE Collaboration) 27"' ICRC, Hauinburg, Germ~any. 8-15 Au,,gu'si 2001

PRODUCTION HEIGHTS OF MUONS DETERMINED WITH THE MUON TRACKING DETECTOR OF THE KASCADE EXPERIMENT J.Zabierowski ct al. (The KASCADE Collaboration) 27" ICRC, Hamiburg, Germany, 8-15 August 2001

THE INFLUENCE OF THE DETECTOR SYSTEM ON THE MEASUREMENTS OF MUON ARRIVAL TIMES IN EXTENSIVE AIR SHOWERS (EAS) R.Heusler .... I1.Zabierowski ct al. (The KASCADE Collaboration) 27" ICRC, Haimiburg, Germm)any, 8-15 Aim1,'imsi2001

SEARCH FOR EXTREMELY HIGH ENERGY GAMMA RAYS WITH THE KASCADE EXPERIMENT F.Fessler, ...., J.Zabierowski ct al. (The KASCADE Collaboration) 27" ICRC, Hamiburg, Germimnly, 8-15.4i,.gt 2001

ATTENUATION AND ABSORPTION LENGTHS OF EAS MEASURED WITH THE KASCADE EXPERIMENT G.Meier, ...,j..Zai)ierowski et al. (The KASCADE Collaboration) 27" ICRC, Huiiauburg, Gerumamzy,8-15,4itit.vr 2001

SEARCH FOR ELONGATED SPATIAL STRUCTURES IN HADRONIC SHOWER CORES WITH KASCADE A.Iwan,.... J.Zabierowski et al. (The KASCADE Collaboration) 27"' ICRC, Hamumburg, Germanmiy 8-15 ,4Ugil.t 2001

A LAYER OF STREAMER TUBE DETECTORS FOR THE MEASUREMENT OF MUONS IN THE KASCADE CENTRAL DETECTOR T.Antoni, ..., J.Zabierowski et al. (The KASCADE Collaboration) 27" ICRC, Hamiiburg, Germamur 8-15 ,Auigt.vm 2001

IMPROVEMENT OF THE RESOLUTION OF THE MUON TRACKING DETECTOR IN THE KASCADE EXPERIMENT R.Obenland, ..., J.Zabicrowski et al.. (The KASCADE Collaboration) 27" ICRC, Hamuburg. Ger imiil.. 8-15 AIm.tus.vt 2001

THE SINGLE SOURCE MODEL AND ULTRA-HIGH ENERGY COSMIC RAYS ORIGIN T.Wibig 27" Mazurian Lakes School of Physic5, Kr yfie, Poland, 2-9 Sept. 2001

ON THE GENERALIZATION OF THE THERMODYNAMICAL PICTURE OF HADRONIC INTERACTIONS AT HIGH ENERGIES lKurp and T.Wihig 21"Mazurian Lakes Scrlool of Physics, Krzyje, Poland, 2-9 Sept. 2001

COMUNICATIONS PUBLISHED IN CONFERENCES PROCEEDINGS

HADRONIC COLLISIONS AT VERY HIGH ENERGY I.Kurp Proc. 1 1" Int. Sc~i'ol,, Particles and C

HADRONIC COLLISIONS AT VERY HIGH ENERGY I.Kurp Proc.of the 12"'Course of the Int.Scho,,l of Cosmic Ray Astrophysics, Emice, Italy, Nov.10-21,2000,Math.Phlmsics and Chiem,,. 44(2001) 126 Annual Report 2001

REGISTRATION OF SIGNALS COMING 500-1000 MICROSECONDS AFTER THE MAIN EAS FRONT J.Gawin, K.Jedrzejczak, J.Karczmarczvk, S.I'achala, J.Swarzvfiski, B.Szabelska, J.Szabelski, T.Wibig, V.V.Pocdubnyj, A.F.Yanin Proc. 27" ICRC. Honiburl, Germani. 1 (2001) 205

NEGATIVE EXCESS IN THE ELECTROMAGNETIC COMPONENT OF GAS AND THE RADIO EMISSION J.N.Capdevielle, F.Cohen, C.Le Gall, .1.Gawin, I.Kurp, B.Szahelska, J.Szabelski, and K.Sanosyan Proc. 277"ICRC, Hamburg. Germanmy, 1 (2001) 319

FLUCTUATIONS OF PARTICLE DENSITY IN GIANT AIR SHOWERS J.N.Capdevielle, F.Cohen. C.Le Gall. J.Gawin, I.Kurp, B.Szahelska, J.Szahelski, and T.Wihig Proc. 27" ICRC, Homburg, Gernuuav, 2 (200/) 465

PRIMARY ENERGY DETERMINATION OF UHE EVENTS FROM PUBLISHED VOLCANO RANCH, YAKUTSC AND AGASA DATA J.N.Capdevielle. F.Cohen, C.Le Gall, J.Gawin, I.Kurp, B.Szahelska, J.Szahelski, and T.Wihig Proc. 27" ICRC, Hamburg, Germoans. 2 (2001) 479

THE HYPERGEOMETRIC FORMALISM FOR THE LATERAL DISTRIBUTION OF CHARGED PARTICLES IN EAS J.N.Capdevielle, F.Cohen. C.Le Gall. J.Gawin, I.Kurp, B.Szabelska, J.Szabelski, and T.Wibig Proc. 27" ICRC. Hamburg, Gernaouv, 2 (2001) 503

THE SMALL MUON TELESCOPE FOR 5 GEV MUON FLUX REGISTRATION IN THE UNDERGROUND LABORATORY IN LODZ J.Gawin, J.Karczniarczvk, J.Swarzv nski. B.Szabelska, J.Szabelski, P.Tokarski, and T.Wibig Proc. 27" ICRC. Hanpbur,,'. Germapi,' 9 (2001) 3535

FORBUSH DECREASES OBSERVED AT THE LEVEL OF 25 M W E. IN THE UNDERGROUND DETECTOR IN LO[17' B.Szabelska, J.Szahelski, T.Wibig, and M.V.Alania Proc. 27" ICRC. Haomburg, Germioaov}, 9 (2001) 3538

NON-EXTENSIVITY IN HADRONIC INTERACTIONS AT HIGH ENERGIES I.Kurp and T.Wibig Proc. 27" ICRC. Hamlbuig, Germoa, 4 (2001) 1350

COSMIC RAYS FROM DARK MATTER HALOS? T.Wibig and A.W.Wolfendale Pr oc. 27" 1CRC, Hamburg, Gernmao,'. 5 (2001) 1792

THE PROPAGATION OF ULTRA-HIGH ENERGY COSMIC RAYS T.Wibig and A.W.Wolfendale Proc. 27" ICRC, Hamburg. Gernmaoov, 5 (2001) 19S7

LARGE MUON TRACKING DETECTOR IN THE KASCADE EAS EXPERIMENT J.Zabierowski et al. (The KASCADE Collaboration) Proc. 27" ICRC. Hamburg 2001, p. R10

PRODUCTION HEIGHTS OF MUONS DETERMINED WITH THE MUON TRACKING DETECTOR OF THE KASCADE EXPERIMENT I.Buettner, ..., J.Zahicrowski et al. (The KASCADE Collaboration) Proc. 27" ICRC. Haniburg 200/.1i. 153

THE INFLUENCE OF THE DETECTOR SYSTEM ON THE MEASUREMENTS OF MUON ARRIVAL TIMES IN EXTENSIVE AIR SHOWERS (EAS) R.Heusler, ..., J.Zabierowski et al. (The KASCADE Collaboration) Proc. 27" ICRC, Hamburg 2001. p. 201

HADRONIC INTERACTION MODELS AND THE AIR SHOWER SIMULATION PROGRAM D.Heck...., J.Zabierowski et al. (The KASCADE Collaboration) Proc. 2 7" ICRC, Ham~butrg 2001, p. 233

THE PRIMARY ENERGY SPECTRUM OF COSMIC RAYS OBTAINED BY MUON DENSITY MEASUREMENTS AT KASCADE A.Haungs, .-- J.Zahierowski et al. (The KASCADE Collaboration) Proc. 27` lCRC, Hanbhurg 2001, p. 63

NONPARAMETRIC DETERMINATION OF ENERGY SPECTRA AND MASS COMPOSITION OF PRIMARY COSMIC RAYS FOR SLANT DEPTH M.Roth, ..., J.Zabieromski et al. .(The KASCADE Collaboration) Proc. 27" ICRC. Haomburg 2001, p. 55

A MEASUREMENT OF THE PRIMARY COSMIC RAY ENERGY SPECTRUM USING THE HADRONIC AIR SHOWER COM PONENT JiHoerandel, ..., J.Zabierowski et al. (The KASCADE Collaboration) Prosc. 27" ICRC, Hamburg 2001, 1. 137 DEPARTMENT OF COSMIC RAY PHYSICS 127

SEARCH FOR EXTREMELY HIGH ENERGY GAMMA RAYS WITH THE KASCADE EXPERIMENT F.Fessler, ..., J.Zabierowski et al. (The KASCADE Collaboration) Proc. 271 ICRC. Hamburg 2001. p. 2 370

ATTENUATION AND ABSORPTION LENGTHS OF EAS MEASURED WITH THE KASCADE EXPERIMENT G.Meier, ..., J.Zabierowski et al. (The KASCADE Collaboration) Proc. 27" ICRC. Hainbur,' 2001. p. 161

SEARCH FOR ELONGATED SPATIAL STRUCTURES IN HADRONIC SHOWER CORES WITH KASCADE A.lwan, . J.Zabicrowski ct al. (The KASCADE Collaboration) Proc. 27" ICRC, Hamiburg 2001, p. 1418

KASCADE-GRANDE: A CONCLUSIVE EXPERIMENT ON THE KNEE M.Bertaina, ..., J.Zabierowski et al. (The KASCADE Collaboration) Proc. 27" ICRC, Hanibuir, 20(01, p. 792

A LAYER OF STREAMER TUBE DETECTORS FOR THE MEASUREMENT OF MUONS IN THE KASCADE CENTRAL DETECTOR T.Antoni, ..., J.Zabierowski et al. (The KASCADE Collaboration) Proc. 27" ICRC, Haniburg 2001. p. 806

TEST OF HADRONIC INTERACTION MODELS WITH THE KASCADE HADRON CALORIMETER J.Milke,..., J.Zabierowski et al. (The ASCADE Collaboration) Proc. 27" ICRC. Hamiburg 2001. p. 241

IMPROVEMENT OF THE RESOLUTION OF THE MUON TRACKING DETECTOR IN THE KASCADE EXPERIMENT R.Obenland, ...,,I.Zabierowski et al. (The KASCADE Collaboration) Proc. 27' ICRC, Hamburg 2001. p. 814

PRIMARY ENERGY SPECTRA OF COSMIC RAYS SELECTED BY MASS GROUPS IN THE KNEE REGION H.Ulrich, ..., J. Zabicrowski et al. (The KASCADE Collaboration) Proc. 27" ICRC. Hamburg 2001, p. 97

MULTIPLE PRODUCTION, TRANSPORT IN ATMOSPHERE AND DETECTION OF HIGH ENERGY COSMIC RAYS J.N.Capdevielle, F.Cohen, C.Le Gall. I.Kurp, B.Szabelska, J.Szabelski Proc. 31/ lot. Symip. on Mithiparticle 1)Dnaniics. Datong, China, 1-7 Sepl. 2001

THE ROLAND MAZE PROJECT J.Gawin, I.Kurp, K.J drzcjczak, P.Pluciniski, B.Szabelska, J.Szabelski, and T.Wibig Proc. 27" Miizriani Lakes SchI(JIl of Physics. Kr-yje, 2-9 Sepl. 2001 ( Acta Physica Polonica, in press)

THE SINGLE SOURCE MODEL AND ULTRA-HIGH ENERGY COSMIC RAYS ORIGIN T.Wibig Proc. 27" Mazurian Lakes School of Physics, Krzyze, 2-9 Sept. 2001 (Acla Physica Polonica, in press)

COSMIC RAYS IN THE ENERGY RANGE OF THE KNEE - RECENT RESULTS FROM KASCADE K.-H.Kampert, ...,.I.Zabicrowski ct al. (The KASCADE Collaboration) Proc. XXX lii/. Svmp. On Mulliparticle Drnaiiics, Til/any (Hungary) 2000, ,,Tihany 2000, From e' e to heavy ion collisiolis (eds. T Csorgo et al.), World Scientific., Singuipore 2001, p. 235-245

SEARCH FOR HIGH ENERGY GAMMA RAYS WITH THE KASCADE EXPERIMENT F.Fessler, ..., J.Zabicrowski et al. (The KASCADE Collaboration) Proc. lnt. Syniip. On High Fneirgy Giiiiimia Rlia Ast-onomy, Heidelberg, Germnany, June 2000, ,,Heidelberg 2000, High eniergy gaimuiuip ray astronomy ". AlP 2001, p. 788-791

UNTERSUCHUNG ZUR VERBESSERUNG DER WINKELAUFLOSUNG DES MYONENSPURDETEKTORS IN KASCADE- EXPERIMENT R.Obenland, C.Buttner, K.Daumiller, P.Doll, K.-H.Kampert, D.Frey, I.Martello, J.Zabierowski. Verhandlungeni der Deuiscihen Gesellschlaft, FrihljahrrstagingBonn 2001, T201. 7, s.36 (abstract only)

PRODUKTIONSHOHENBESTIMMUNG VON MYONEN MIT DEM MYONSPURDETEKTOR DES KASCADE- EXPERIMENTE C.Buttner, K.Daumiller, P.Doll, K.-H.Kampert, D.Frey, D.Martello, R.Obenland, J.Zabierowski Verhandluingeit der Deutschen PlivIsikalis(clen Gesellschaft, FriihijalrstaguingBonn 2001, T201.8, s.37 (abstractonly)

THE CELSIUS-WASA DETECTOR FACILITY J.Zabicrowski for CELSIUS/WASA collab. Proc. Workshop ,'i, Eta Physics, Uppsiala. Szwierja, (2001) Physica Scripta, in press

PION PRODUCTION IN pN COLLISIONS NEAR THRESHOLD J.Zlomanczuk,..., J.Stepaniak,..., J.Zabierowski et al. AlP Cont Proc., Dec.2001, Vol.603,1P.211, Mesios and Light Nuclei: 8"' Conf: 2001, Prague, Czech Republik. ed. by J.Adams. et il.

EXCLUSIVE MEASUREMENT OF THE pp --> ppt7rt REACTION CLOSE TO THRESHOLD W.Brodowski, ., J.Stepaniak, J.Zabicrowski et al. AIP CGmf: Proc., Dec.2001, Vol.603. p.503. Mesons and Light Nuclei: 8"' Conf 2001, Prague, Czech Republik, ed. by J.Adamts et al. 128 Annual Report 2001

SOME FEATURES OF THE pd-->ppn n" REACTION AT 1.037 GeV J.Stepaniak,..., J.Zabierowski et al. AIP Conf Proc., Dec.2001, Vol.603, p.531, Mesons undl Light Nuclei: 8"' Cont: 2001, Prague, Czech Republik, ed. b1yJ.Adar is et al.

LECTURES, COURSES AND EXTERNAL SEMINARS

MASS COMPOSITION AT 105 EV AND ANIZOTROPY AT I0W'EV T.Wibig, Deparmnent of Experimeintal Physics, Un~iversity of LJd, 22 February 200]

COSMIC RAYS OF THE HIGHEST ENERGIES - NEW SOLUTION OF THE OLD PUZZLE ' T.Wibig, Department of Physics, Warsaw Universitv. 2 April 2001

a) in Polish

CHAIRING OF CONFERENCE SESSIONS

J.Szabelski - chairing of session at the 11" hit. Scholol,. Particles and(Coso~logy .", Baksan Vale',, Kabardino-Balkaria, Ru.:sian Federation, 18-24 Apri 2001

J.Szabelski - chairing of session at the 27" Mazurian Lakes School of Physics, Kr~yye, Polanid, 2-9 September 2001

DIDACTIC ACTIVITY

T.Wibig -Supervisor of PhD thesis of Mrs l.Kurp (IPJ) ,,Thermodynamical description of particle production processes in ultra-high energy collisions"

J.Zabicrowski - Supervisor of PhD thesis of Mrs A.lwan (University of Lodz) ,Studies of hadrons in extensive air showers basing on the data from KASCADE experiment"

SCIENCE POPULARIZATION ACTIVITY

HOW COSMIC RAYS HAVE BEEN DISCOVERED T.Wibig, Lecture during l` Science Festival. L6dS', 15-17 May 2001

WHAT ARE COSMIC RAYS? J.Szabelski, Lecture during 1" Scie,,ce Festival, Ldd'. 15-17 May 2001

J.Szabelski, T.Wibig demonstrating of air shower array and cosmic ray registrations for students of three high schools(during 1' Scielice Festival Lad', 15-17 Mav 2001)

J.Szabelski, T.Wibig TV plo,,rci iii,,RetSatl looks at the stors '. Decemblser 2001

PERSONNEL

Research scientists Jerzy Gawin, Professor 1/2 Tadeusz Wibig, DSc., 1/3 Barbara Szabelska, Dr. Janusz Zabierowski, DSc. Jacek Szabelski, Dr.

PhD students Izabela Kurp, MSc.

Technical and administrative staff Jadwiga Feder Zygmunt Piskor 1/5 (up to May 31) Karol J~drzejczak 1/2 (up to August 31) Pawel Pluciniski Jacek Karczmarczyk ½/2 J6zef Swarzyfiski Ryszard Lewandowski Przemyslaw Tokarski Stefan Pachala 1/5