DOCSLIB.ORG

The Double Chooz Reactor Neutrino Experiment

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Double Chooz Reactor Neutrino Experiment The Double Chooz reactor neutrino experiment Inés Gil Botella 3rd CHIPP Neutrino Meeting November 17 -18, 2008 Overview The search for the θ13 mixing angle Neutrino measurements at reactor experiments The Double Chooz experiment Physics goals Experimental concept Detector design Present status Expected sensitivity and schedule Summary Inés Gil-Botella Page 2 Current knowledge on neutrino mixing parameters Best global limit on θ13 Experimental measurements arXiv:0808.2016 Global (90% CL) 2 sin θθθ13 ≤≤≤ 0.035 arXiv:0808.2016 2 θθθ13 , sign( ∆∆∆m 31 ), δδδ-CP ?? Inés Gil-Botella Page 3 The θθθ13 mixing angle The only mixing angle unknown CHOOZ Crucial for CP violation measurements in R = 1.01 ±±± 2.8%(stat) ±±± leptonic sector 2.7%(syst) Best experimental limit: CHOOZ reactor experiment νννe →→→ννν x νe νe (disappearance experiment) Pth = 8.4 GWth , L = 1.050 km, M = 5 t Overburden: 300 mwe 2 θ sin (2 13 ) < 0.12 - 0.2 (90% C.L) M. Apollonio et. al., Eur.Phys.J. C27 (2003) 331-374 Inés Gil-Botella Page 4 Measuring θθθ13 : ννν-reactors vs super-beams Accelerator experiments : appearance experiments → 2 2 2 P( νµ νe) depends on sin (2θ13 ), sin (θ23 ), sign( ∆m 31 ), δCP phase Parameter degeneracies and correlations Matter effects sensitive Reactor ννν experiments are unique for: Unambiguous determination of θ13 no dependence on δCP No parameter degeneracies no dependence on mass hierarchy No matter effects 2 weak dependence on ∆m 12 Resolve θ23 degeneracy combined with accelerator experiments Reactor advantages with respect to accelerators : ►Pure θ 13 Both type of experiments ►Pure ν--, no flavor contamination e provide independent and ►ν flux known at few% complementary ► Smaller detectors (cheaper) information Inés Gil-Botella Page 5 Neutrino oscillations at nuclear reactors _ νννe disappearance searches ∆m 2 L ∆m 2 L P ≈1− sin 2 2θ sin 2 13 − cos4 θ sin 2 2θ sin 2 21 ee 13 E 13 12 E 4 ν 4 ν 2 Small deficit (= sin 2θθθ13 ) high precision is necessary Inés Gil-Botella Page 6 Antineutrino detection at nuclear reactors _ νννe detection: inverse beta decay + ve + p → n + e n + Gd → 8 MeV γ Prompt photons from e+ annihilation: EVIS ≈ Eν - (Mn-Mp) + m e Delayed photons from n capture: on H : ∆t ~200 µs, E~2 MeV on dedicated nuclei (Gd): ∆t ~30 µs, E ~8 MeV Inés Gil-Botella Page 7 Expected backgrounds at nuclear reactors Accidental events: e+ signal-like : radioactivity from n materials, PMTs, surrounding rock,… + Gd n signal-like : true neutrons from γγγ cosmic µ´s or gammas mimicking Eγγγ >~ 1 MeV ΣγΣγΣγ ~ 8 MeV neutrons Correlated events: n deposits energy Fast n : produced by cosmic µ´s Recoil-p (low energy) + Gd-capture n Gd Long-lived isotopes : 9Li & 8He ( β-n ΣγΣγΣγ ~ 8 MeV decay) Inés Gil-Botella Page 8 Complementarity with super-beams hep-ph/0601266 3σσσ discovery potential 3σσσ sensitivity (no signal) Inés Gil-Botella Page 9 Reactor neutrino experiments Double Chooz RENO Daya Bay Angra st 2 1 generation: sin (2 θ13 )~0.02-0.03 nd 2 2 generation: sin (2 θ13 ) 0.01 Inés Gil-Botella Page 10 Comparison between reactor experiments Thermal Depth Target Distances Near/Far Experiments Location Power Near/Far Mass (m) (GW) (mwe) (tons) Double Chooz France 8.7 400/1050 115/300 10/10 RENO Korea 16.4 290/1380 120/450 15/15 Daya Bay China 11.6 360(500)/1985(1613) 260/910 40 ×××2/80 Inés Gil-Botella Page 11 The Double Chooz experiment Inés Gil-Botella Page 12 Double Chooz goals Measure the θθθ13 mixing angle 2 Goal : sin 2θ13 < 0.03 @ 90% CL in 3 years Needed improvements : Increase statistics Suppress backgrounds More powerful reactors Improve detector design Longer exposure Better cosmic muon veto detectors Larger detector mass External shielding Reduce systematic uncertainties Near/Far detector comparison to minimize reactor errors Identical detectors to do relative measurements Detailed calibration program Non-proliferation studies (interest of IAEA) Use DC near detector as prototype for reactor monitoring Inés Gil-Botella Page 13 Double Chooz collaboration Spokesman: Hervé de Kerret (APC) France : APC Paris, CEA/Dapnia Saclay, Subatech Japan : HIT, Kobe, MUE, Niigata, TGU, TIT, TMU, Nantes, Strasbourg Tohoku Germany : Aachen, MPIK Heidelberg, TU München, Russia : RAS, RRC Kurchatov Institute EKU Tübingen, Hamburg USA : Alabama, ANL, Chicago, Columbia, Drexel, Spain : CIEMAT Madrid Illinois, Kansas, LLNL, LSU, Notre Dame, Sandia, Tennessee, UCD UK : Univ. Sussex Brazil : CBPF, UNICAMP Collaboration Meeting June 2008 Inés Gil-Botella Page 14 Double Chooz concept Near detector (400 m) Far detector (1050 m) 115 m.w.e. 300 m.w.e. ν ν ν ν ν ν ν 2 reactors - 8.5 GWth Far site already exists 2 identical detectors: ►Target: 2 x 8.3 t Comparison of neutrino rate & energy spectrum Civil work: ► 1 near lab is foreseen Chooz B nuclear power plant ► 1 farInés lab Gil-Botella is available Page 15 Ardennes, France Survival probability 2 “identical” detectors Rate comparison Spectral distortion ND Limit: FD Systematics Backgrounds Rate + shape information if θθθ13 not too small νννe νννe ? Far/Near energy bin ratio energy Far/Near Inés Gil-Botella Page 16 Far and near labs Far site (1050 m) Near site (400 m) ~ 500 evts/day ~ 70 evts/day Inés Gil-Botella Page 17 Detector design Outer veto Acrylic Target vessel (10.3 m 3 Gd-doped LS) Inner R =1.15 m H = 2.474 m t = 8 mm 7 m Acrylic Gamma catcher vessel Stainless steel (22.6 m 3 LS) Buffer (110 m 3 mineral oil) Inner R = 1.696 m Inner R = 2.758 m Inner H = 3.55 m Inner H = 5.674 m t = 12 mm t = 3 mm Inner VETO (90 m 3 LS) Shielding (steel) Inner R = 3.27 m Inner R = 3.471 m Inner H = 7 m Inner H = 6.840 m t = 10 mm t = 150 mm 7 m Inés Gil-Botella Page 18 Detector in the lab Electronics racks OTHER SYSTEMS OTHER SYSTEMS Calibration Systems Outer Muon Veto: Glove Box Plastic scintillator strips with X/Y meas Inés Gil-Botella Page 19 R&D activities and tests fADCs CAEN V1721 @ APC 1/5 mockup @ Saclay L1 Trigger board @ Aachen Magnetic tests @ CIEMAT Gd doped scintillator development @ MPIK Inés Gil-Botella Page 20 Current activities: Far lab integration Cleanliness + radiopurity measurements ongoing Civil engineering work completed Pit refurbished Access adapted Inés Gil-Botella Page 21 Current activities: Near lab preparation Neutrino Lab 85 m open air Site engineering study completed ramp (14%) Tender process for construction soon 155 m of Schedule: lab finished beginning 2010 gallery (12%) Neutrino Lab Liquid Handling and Storage Building ~12 m ~12 24 m >45 m rock overburden 85 m open air ramp (14%) 155 m of gallery (12%) Inés Gil-Botella Page 22 Current activities: Steel shield installation finished Assembly of each side of the bottom part Integration completed Demagnetization of steel shielding bars Inés Gil-Botella Connection of two bars Page 23 8m Current activities: Inner veto vessel installation in progress Inés Gil-Botella Page 24 Current activities: Inner detector components Scintillator production Mechanical vessels: Main components needed for both acrylics and buffer detectors have been delivered and Design completed checked Manufacturing is on going Scintillator hall ready Gd delivered Iso-tank for GC liquid Current activities: Tools for acrylics handling Target vessel tool COMPLETED!! Gamma-catcher vessel tool Inés Gil-Botella Page 26 Current activities: PMT production completed 10” R7081Low backgroundHamamatsu glass PMTs PMT geometry baseline (390 PMTs/detector) Being tested HV splitters PMT mechanical support & magnetic shield Production completed Inés Gil-Botella Production completed Page 27 Delivered Current activities: PMT testing and assembly PMT testing almost finished PMT assembly in progress Inés Gil-Botella Page 28 Current activities: Inner & Outer veto systems Inner Veto Outer Veto Tag efficiently cosmic ray muons & Redundancy for higher rejection external fast neutrons entering the power detector Full prototype built and tested 78 8” PMTs delivered and tested Inés Gil-Botella Page 29 Calibration systems Fish-line (Z-axis) Glove Box GC guide Tube Articulated Arm Embedded LED calibration system 385, 420, 470 nm Buffer guide Tube Inés Gil-Botella Page 30 Statistical and systematic errors @CHOOZ: R = 1.01 ±±± 2.8%(stat) ±±± 2.7%(syst) – Statistical error – Luminosity = ∆t x P(GW) x Np(target ) CHOOZ Double-Chooz Target volume 5.55 m 3 10.3 m 3 Target composition 6.77 10 28 H/m 3 6.55 10 28 H/m 3 Data taking period Few months 3-5 years CHOOZ-far : 40 000/3 y Event rate 2700 CHOOZ-near: ~1 10 6/3 y Statistical error 2.8% 0.5% – Systematic errors – Improve the detector design Two identical detectors: towards σrelative ~0.6% Careful backgrounds control: subtraction error<1% Inés Gil-Botella Page 31 Background rates hep-ex/0606025 (Old position) Inés Gil-Botella Page 32With new location N ν/2, N µ/3 Expected θθθ13 sensitivity 2 phases expected: FD 1. Far detector only : σσσsys =2.5% 10 x CHOOZ statistics sin 22θθθ <0.06 FD & ND θθ13 σσσsys =0.6% 2. Far + near detectors : shape analysis 2 sin 2θθθ13 <0.03 Double-Chooz can surpass the original CHOOZ result in 3 months (even with a single detector) Inés Gil-Botella Page 33 Schedule Proposal of the experiment ( hep-ex/0606025 ) Technical Design Report finished The first detector is being installed! Schedule: 2008-Summer 2009 : Far detector integration Summer 2009 : Far detector commissioning Beg. 2010 : Near lab completed 2010 : Near detector installation 2011 : Near and far detectors data taking Inés Gil-Botella Page 34 Summary Double Chooz is the first new generation reactor neutrino experiment using two identical detectors at different distances to measure θ13 Far detector installation has started! First data taking expected to start in 2009 with far detector: 2 sin 2θθθ13 < 0.06 in 1.5 years (90% CL) (if no oscillation) Data taking with far and near detectors in 2011: 2 sin 2θθθ13 < 0.03 in 3 years (90% CL) (if no oscillation) Inés Gil-Botella Page 35 Danke schön! Merci! BACKUP SLIDES Systematics Inés Gil-Botella Page 38 Relative normalization: analysis e+ @Chooz: 1.5% syst.
Load more

Recommended publications
  • Realization of the Low Background Neutrino Detector Double Chooz: from the Development of a High-Purity Liquid & Gas Handling Concept to first Neutrino Data
    Realization of the low background neutrino detector Double Chooz: From the development of a high-purity liquid & gas handling concept to first neutrino data Dissertation of Patrick Pfahler TECHNISCHE UNIVERSITAT¨ MUNCHEN¨ Physik Department Lehrstuhl f¨urexperimentelle Astroteilchenphysik / E15 Univ.-Prof. Dr. Lothar Oberauer Realization of the low background neutrino detector Double Chooz: From the development of high-purity liquid- & gas handling concept to first neutrino data Dipl. Phys. (Univ.) Patrick Pfahler Vollst¨andigerAbdruck der von der Fakult¨atf¨urPhysik der Technischen Universit¨atM¨unchen zur Erlangung des akademischen Grades eines Doktors des Naturwissenschaften (Dr. rer. nat) genehmigten Dissertation. Vorsitzender: Univ.-Prof. Dr. Alejandro Ibarra Pr¨uferder Dissertation: 1. Univ.-Prof. Dr. Lothar Oberauer 2. Priv.-Doz. Dr. Andreas Ulrich Die Dissertation wurde am 3.12.2012 bei der Technischen Universit¨atM¨unchen eingereicht und durch die Fakult¨atf¨urPhysik am 17.12.2012 angenommen. 2 Contents Contents i Introduction 1 I The Neutrino Disappearance Experiment Double Chooz 5 1 Neutrino Oscillation and Flavor Mixing 6 1.1 PMNS Matrix . 6 1.2 Flavor Mixing and Neutrino Oscillations . 7 1.2.1 Survival Probability of Reactor Neutrinos . 9 1.2.2 Neutrino Masses and Mass Hierarchy . 12 2 Reactor Neutrinos 14 2.1 Neutrino Production in Nuclear Power Cores . 14 2.2 Energy Spectrum of Reactor neutrinos . 15 2.3 Neutrino Flux Approximation . 16 3 The Double Chooz Experiment 19 3.1 The Double Chooz Collaboration . 19 3.2 Experimental Site: Commercial Nuclear Power Plant in Chooz . 20 3.3 Physics Program and Experimental Concept . 21 3.4 Signal . 23 3.4.1 The Inverse Beta Decay (IBD) .
    [Show full text]
  • Results in Neutrino Oscillations from Super-Kamiokande I
    Status of the RENO Reactor Neutrino Experiment RENO = Reactor Experiment for Neutrino Oscillation (For RENO Collaboration) K.K. Joo Chonnam National University February 15, 2011 Research Techniques Seminar @FNAL Outline Experiment Goals of the RENO Exp. - Short introduction - Expected q13 sensitivity - Systematic uncertainty Overview of the RENO Experiment - Experimental Setup of RENO - Schedule - Tunnel excavation - Status of detector construction - DAQ, data analysis tools Summary Brief History of Neutrinos 1930: Pauli postulated neutrino to explain b decay problem 1933: Fermi baptized the neutrino in his weak-interaction theory 1956: First discovery of neutrino by Reines & Cowan from reactor 1957: Neutrinos are left-handed by Glodhaber et al. 1962: Discovery of nm by Lederman et al. (Brookhaven Lab) 1974: Discovery of neutral currents due to neutrinos 1977: Tau lepton discovery by Perl et al. (SLAC) 1998: Atmospheric neutrino oscillation observed by Super-K 2000: nt discovery by DONUT (Fermilab) 2002: Solar neutrino oscillation observed by SNO and confirmed by Kamland What NEXT? Standard Model Neutrinos in SM Neutrino Oscillation . Three types of neutrinos exist & mixing among them Oscillation parameters (q12 , q23 , q13) Not measured yet . Elementary particles with almost no interactions . Almost massless: impossible to measure its mass Neutrino Mixing Parameters Matrix Components: νe Ue1 Ue2 Ue3 ν1 3 Angles (θ ; θ ; θ ) 12 13 23 ν U U U ν 1 CP phase (δ) μ μ1 μ2 μ3 2 2 Mass differences ντ Uτ1 Uτ2 Uτ3 ν3 1 0 0 c 0 s ei c s 0 13 13 12 12 U 0 c23 s23 0 1 0 s12 c12 0 i 0 s23 c23 s13e 0 c13 0 0 1 atmospheric SK, K2K The Next Big Thing? SNO, solar SK, KamLAND ≈ ≈ ° q23 qatm 45 q12 ≈qsol ≈ 32° Large and maximal mixing! Reduction of reactor neutrinos due to oscillations Disappearance Reactor neutrino disappearance Prob.
    [Show full text]
  • Letter of Interest Forthcoming Science from The
    Snowmass2021 - Letter of Interest Forthcoming Science from the PROSPECT-I Data Set Neutrino Frontier Topical Groups: (NF02) Sterile neutrinos (NF03) Beyond the Standard Model (NF07) Applications (NF09) Artificial neutrino sources Contact Information: Nathaniel Bowden (LLNL) [[email protected]] Karsten Heeger (Yale University) [[email protected]] Pieter Mumm (NIST) [[email protected]] M. Andriamirado,6 A. B. Balantekin,16 H. R. Band,17 C. D. Bass,8 D. E. Bergeron,10 D. Berish,13 N. S. Bowden,7 J. P.Brodsky,7 C. D. Bryan,11 R. Carr,9 T. Classen,7 A. J. Conant,4 G. Deichert,11 M. V.Diwan,2 M. J. Dolinski,3 A. Erickson,4 B. T. Foust,17 J. K. Gaison,17 A. Galindo-Uribarri,12, 14 C. E. Gilbert,12, 14 C. Grant,1 B. T. Hackett,12, 14 S. Hans,2 A. B. Hansell,13 K. M. Heeger,17 D. E. Jaffe,2 X. Ji,2 D. C. Jones,13 O. Kyzylova,3 C. E. Lane,3 T. J. Langford,17 J. LaRosa,10 B. R. Littlejohn,6 X. Lu,12, 14 J. Maricic,5 M. P.Mendenhall,7 A. M. Meyer,5 R. Milincic,5 I. Mitchell,5 P.E. Mueller,12 H. P.Mumm,10 J. Napolitano,13 C. Nave,3 R. Neilson,3 J. A. Nikkel,17 D. Norcini,17 S. Nour,10 J. L. Palomino,6 D. A. Pushin,15 X. Qian,2 E. Romero-Romero,12, 14 R. Rosero,2 P.T. Surukuchi,17 M. A. Tyra,10 R. L. Varner,12 D. Venegas-Vargas,12, 14 P.B.
    [Show full text]
  • APC Scientific Board 2017 Tech
    2012-2016 APC Laboratory Technical Activities T. Zerguerras on behalf of the Technical Departments 20/11/2017 APC Scientific Board 2017 1 Technical Departments Organisation Equipment, facilities and platform Instrumentation Department (Techniques Expérimentales) Electronics and Microelectronics Department Mechanics Department IT Department Quality Unit R&D: CMB µelectronic, Compton, GAMMACUBE, Liquido Analysis & Prospects 20/11/2017 APC Scientific Board 2017 2 General organisation • 5 technical departments + Quality Unit + the FACe platform • Building an instrument => combining skills 22/09/2017 APC Scientific Board 2017 3 Technical departments organisation Matrix organisation structure: Project/Department (Assignment to a department, participation to projects) One specific skill (Mechanics, Electronics/µelectronics, Instrumentation, IT, QA/PA) Transverse activities of the Quality Unit Supervision : Head of department Project coordination: Project manager Indicator Boards for activities and assignments monitoring Project Monitoring Committee (Comité de Suivi de Projets CSP) This organisation aims to create a bond of trust with funding and tutelage agencies 20/11/2017 APC Scientific Board 2017 4 Organisation: Technical staff evolution On 31/12 Technical departments staff evolution 60 Technical departments staff - Gender 45 50 40 40 35 34 30 30 33 35 38 38 Permanent 25 MEN Fixed-term 20 38 40 39 40 39 20 WOMEN 15 10 10 15 17 13 12 12 5 10 11 9 10 11 0 0 2012 2013 2014 2015 2016 2012 2013 2014 2015 2016 Technical departments
    [Show full text]
  • Muon Spallation in Double Chooz
    Muon Spallation in Double Chooz Claire Thomas∗ REU, Columbia University and MIT (Dated: August 10, 2009) This report presents my work for Double Chooz at MIT during the 2009 Summer REU program, funded by Columbia University. Double Chooz is a reactor neutrino experiment that aims to measure the mixing parameter θ13. The experiment detects electron antineutrinos via inverse beta decay. Neutrons and light nuclei made in muon spallation are a major background to the experiment. The delayed neutron emitter 9Li is especially problematic because it mimics the inverse beta decay signal. For this reason I studied muon spallation in Double Chooz, focusing on the production and subsequent decay of 9Li. There are two key differences between 9Li decay and inverse beta decay. The first is that 9Li is a β− decay, so it emits an electron, whereas inverse beta decay emits a positron. The second difference is the energy of the neutrons emitted. In 9Li decay the neutron energy is on the order of MeV, whereas the inverse beta decay neutron has a negligible kinetic energy. Since Double Chooz does not distinguish charge, the positrons and electrons are not easy to distinguish. First, I ran simulations of electrons and positrons in the Double Chooz detector and constructed a late light variable to distinguish them from electrons. This proved insufficient, so I wrote general software to simulate radioactive decays in the Double Chooz detector. In this report I present the deposited energy spectra of a few important decays. 1. INTRODUCTION The consequence of neutrino oscillation is that an ex- periment that is sensitive to only one of the three neu- 1.1.
    [Show full text]
  • Neutrino Oscillation Studies with Reactors
    REVIEW Received 3 Nov 2014 | Accepted 17 Mar 2015 | Published 27 Apr 2015 DOI: 10.1038/ncomms7935 OPEN Neutrino oscillation studies with reactors P. Vogel1, L.J. Wen2 & C. Zhang3 Nuclear reactors are one of the most intense, pure, controllable, cost-effective and well- understood sources of neutrinos. Reactors have played a major role in the study of neutrino oscillations, a phenomenon that indicates that neutrinos have mass and that neutrino flavours are quantum mechanical mixtures. Over the past several decades, reactors were used in the discovery of neutrinos, were crucial in solving the solar neutrino puzzle, and allowed the determination of the smallest mixing angle y13. In the near future, reactors will help to determine the neutrino mass hierarchy and to solve the puzzling issue of sterile neutrinos. eutrinos, the products of radioactive decay among other things, are somewhat enigmatic, since they can travel enormous distances through matter without interacting even once. NUnderstanding their properties in detail is fundamentally important. Notwithstanding that they are so very difficult to observe, great progress in this field has been achieved in recent decades. The study of neutrinos is opening a path for the generalization of the so-called Standard Model that explains most of what we know about elementary particles and their interactions, but in the view of most physicists is incomplete. The Standard Model of electroweak interactions, developed in late 1960s, incorporates À À neutrinos (ne, nm, nt) as left-handed partners of the three families of charged leptons (e , m , t À ). Since weak interactions are the only way neutrinos interact with anything, the un-needed right-handed components of the neutrino field are absent in the Model by definition and neutrinos are assumed to be massless, with the individual lepton number (that is, the number of leptons of a given flavour or family) being strictly conserved.
    [Show full text]
  • PROSPECT Upgrade
    Precision Reactor Upgrade significantly expands oscillation Oscillation and physics reach in unique parameter space ] prospect.yale.edu ] ] 2 2 90% CL 90% CL 2 90% CL SPECTrum Experiment: PROSPECT, 1 yr Sensitivity PROSPECT, 2 yr Optimized Sensitivity PROSPECT, 2 yr Optimized Sensitivity PROSPECT, 2 yr Sensitivity DANSS Exclusion PROSPECT, 2 yr Optimized Sensitivity, σspectrum = 5% [eV [eV PROSPECT, 2 yr Optimized Sensitivity NEOS Exclusion [eV DYB Exclusion KATRIN Exclusion 2 41 PROSPECT, Current Sensitivity 2 41 STEREO, Current Exclusion 2 41 PROSPECT-I demonstrated PROSPECT, Current Exclusion STEREO, Expected Sensitivity LBN CPV Ambiguity Limit m m 10 m SBL + Gallium Anomaly (RAA + Evolution), 95% CL Δ 10 Δ 10 Upgrade & Science Goals Δ excellent performance H. Pieter Mumm for the PROSPECT collaboration 6 Primary Physics Goals Li capture Search for sterile neutrino oscillation 1 1 1 • Nuclear recoil within unique parameter space important for the reactor anomaly and Long Baseline Electronic recoil experiments. 235 • High-resolution U spectrum and flux 10−1 10−1 10−1 measurement addresses observed shape 10−2 10−1 1 10−2 10−1 1 10−2 10−1 1 sin22θ sin22θ sin22 discrepancies 14 14 θ14 Pulse shape discrimination (PSD) PROSPECT measurement strategy capable scintillator with high light yield • Unique 6Li-doped liquid scintillator as inverse Left: Comparison of sterile oscillation sensitivities for current and projected PROSPECT-II datasets. allows for excellent background beta decay target; distinct IBD topology Center: Projected PROSPECT-II sensitivity compared to selected short-baseline reactor experiments. rejection and > 5%/ E resolution. • Highly segmented array for background Right: Overlap of three year PROSPECT-II sensitivity with relevant regions of parameter space rejection and event localization • ~ 7m baseline to very compact highly- PROSPECT-II uniquely addresses a high Δ m2 region between enriched reactor core provides unique 1 eV2 - 15 eV2, and will reach the 5o sin2(2�14) sensitivity over sensitivity at high Δ m2.
    [Show full text]
  • Double Chooz: the Show Goes On!
    Double Chooz: The Show Goes On! Lindley Winslow University of California Los Angeles On behalf of the Double Chooz Collaboration The Double Chooz Collaboration: Brazil France Germany Japan Russia Spain USA CBPF APC EKU Tübingen Tohoku U. INR RAS CIEMAT- U. Alabama UNICAMP CEA/DSM/ MPIK Tokyo Inst. Tech. IPC RAS Madrid ANL UFABC IRFU: Heidelberg Tokyo Metro. U. RRC U. Chicago SPP RWTH Aachen Niigata U. Kurchatov Columbia U. SPhN TU München Kobe U. UCDavis SEDI U. Hamburg Tohoku Gakuin U. Drexel U. SIS Hiroshima Inst. IIT SENAC Tech. KSU CNRS/IN2P3: LLNL Subatech MIT IPHC U. Notre Dame Spokesperson: U. H. de Kerret (IN2P3) Tennessee Project Manager: Ch. Veyssière (CEA-Saclay) Web Site: www.doublechooz.org/ 2 Theory favored small sin 2θ13! Model Review Theory Order of Magnitude Prediction by Albright et. al. ArXiv:0803.4176 Le-Lμ-Lτ 0.00001 SO(3) 0.00001 Neutrino Factory S3 and S4 0.001 Designs A4 Tetrahedral 0.001 Texture Zero 0.001 Reactor Experiment RH Dominance 0.01 Design SO(10) with Sym/Antisym 0.01 Contributions Limit as SO(10) with lopsided 0.1 masses of 2011 Measuring the last mixing angle: 1.0 Probability 2 2 2 P = 1 - sin 2!13 sin (1.27 "m L/E)! Distance ~1000 meters Measuring the last mixing angle: 1.0 Probability 2 2 2 P = 1 - sin 2!13 sin (1.27 "m L/E)! Distance ~1000 meters Remember: We are looking for an effect as a function of L/E. Construction Underway! Double Chooz Analysis is Unique: • Analysis uses BOTH Rate and Energy information ➙Detailed Energy Response Model • Simple Reactor Configuration ➙ Multiple analysis periods.
    [Show full text]
  • Highlight Talk from Super-Kamiokande †
    Communication Highlight Talk from Super-Kamiokande † Yuuki Nakano and on behalf of the Super-Kamiokande Collaboration Kamioka Observatory, Institute for Cosmic Ray Research, The University of Tokyo, Higashi-Mozumi 456, Kamioka-cho, Hida-city Gifu 506-1205, Japan; [email protected]; Tel.: +81-578-85-9665 † This paper is based on the talk at the 7th International Conference on New Frontiers in Physics (ICNFP 2018), Crete, Greece, 4–12 July 2018. Received: 30 November 2018; Accepted: 7 January 2019; Published: 9 January 2019 Abstract: Super-Kamiokande (SK), a 50 kton water Cherenkov detector in Japan, is observing both atmospheric and solar neutrinos. It is also searching for supernova (relic) neutrinos, proton decays and dark matter-like particles. A three-flavor oscillation analysis was conducted with the atmospheric neutrino data to study the mass hierarchy, the leptonic CP violation term, and other oscillation parameters. In addition, the observation of solar neutrinos gives precise measurements of the energy spectrum and oscillation parameters. In this proceedings, we given an overview of the latest results from SK and the prospect toward the future project of SK-Gd. Keywords: Super-Kamiokande; atmospheric neutrino; solar neutrino; neutrino oscillation; CP violation; proton decay 1. Introduction A theoretical framework of neutrino oscillation has been established in the past 50 years [1,2]. Neutrino physics has been dominated by the measurement of oscillation parameters and such measurements suggest that neutrinos are massive and mixing in the lepton sector [3]. Within the three- 2 2 flavor framework, three mixing angles (q12, q23, and q13) and two mass splittings (Dm21 and Dm32,31) are measured among neutrino experiments.
    [Show full text]
  • Overview of Hyper-Kamiokande
    Overview of Hyper-Kamiokande Masato Shiozawa ANT11 Workshop, Oct.-10-2011 Kamioka Observatory, Institute for Cosmic Ray Research, U of Tokyo, and Kamioka Satellite, Institute for the Mathematics and Physics of the Universe, U of Tokyo Establish θ13, then CP violation T2K collaboration, PRL107,041801(2011) Fogli et al., arXiv1106.6028 T2K observed indication of νμ→νe titled “Evidence of θ13>0 from global ν analysis” Data ν Osc. e CC ν ν MeV) μ+ μ CC 3 ν e CC NC 2 Nobs : 6 νe candidates Nexp : 1.5±0.3(syst) 2 for sin 2θ13=0 1 nonzero θ13 at 2.5σ Number of events /(250 Number of events 0 0 1000 2000 3000 ν Reconstructed energy (MeV) nonzero θ13 is already >3σ w/ solar and reactorν ‣T2K aims to establish nonzero θ13 and measure it w/ more data ‣reactor experiments are starting data taking (Double CHOOZ, RENO, Daya Bay) It’s now time to seriously think about next generation 2 experiments assuming θ13≠0 (sin θ13= a few %). Hyper-K WG, arXiv:1109.3262 [hep-ex] Letter of Intent: The Hyper-Kamiokande Experiment — Detector Design and Physics Potential — K. Abe,12, 14 T. Abe,10 H. Aihara,10, 14 Y. Fukuda,5 Y. Hayato,12, 14 K. Huang,4 A. K. Ichikawa,4 M. Ikeda,4 K. Inoue,8, 14 H. Ishino,7 Y. Itow,6 T. Kajita,13, 14 J. Kameda,12, 14 Y. Kishimoto,12, 14 M. Koga,8, 14 Y. Koshio,12, 14 K. P. Lee,13 A. Minamino,4 M. Miura,12, 14 S.
    [Show full text]
  • APC - Astroparticule Et Cosmologie Rapport Hcéres
    APC - Astroparticule et cosmologie Rapport Hcéres To cite this version: Rapport d’évaluation d’une entité de recherche. APC - Astroparticule et cosmologie. 2013, Université Paris Diderot - Paris 7, Commissariat à l’énergie atomique et aux énergies alternatives - CEA, Centre national de la recherche scientifique - CNRS, L’Observatoire de Paris. hceres-02031598 HAL Id: hceres-02031598 https://hal-hceres.archives-ouvertes.fr/hceres-02031598 Submitted on 20 Feb 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Department for the evaluation of research units AERES report on unit: AstroParticule et Cosmologie APC Under the supervision of the following institutions and research bodies: Université Paris 7 - Denis Diderot Centre National de la Recherche Scientifique Commissariat à l’Energie Atomique et aux Energies Alternatives Observatoire de Paris January 2013 Research Units Department The president of AERES "signs[...], the evaluation reports, [...]countersigned for each evaluation department by the relevant head of department (Article 9, paragraph 3, of french decree n°2006-1334 dated 3 november 2006, revised). Astro-Particule et Cosmologie, APC, UP7, CNRS, CEA, Observatoire de Paris, Mr Pierre BINETRUY Grading Once the visits for the 2012-2013 evaluation campaign had been completed, the chairpersons of the expert committees, who met per disciplinary group, proceeded to attribute a score to the research units in their group (and, when necessary, for these units’ in-house teams).
    [Show full text]
  • The Double Chooz Experiment
    The Double Chooz experiment M. Goger-Neff,¨ M. Franke, N. Haag, M. Hofmann, L. Oberauer, P. Pfahler, W. Potzel, S. Schonert,¨ H. TrinhThi, V. Zimmer Introduction The goal of the Double Chooz experiment is the precise determination of the neutrino mixing angle θ13. Two iden- tical detectors measure the electron antineutrinos emitted from two nuclear reactors at the Chooz nuclear power sta- tion in France. The far detector in 1 km distance from the reactor cores started data taking in April 2011. A second near detector at a distance of about 400 m from the reactors is currently under construction and will start data taking in 2014. The near detector will monitor the unoscillated neu- trino flux whereas the far detector is searching for a disap- pearance effect due to neutrino oscillations. If the electron antineutrinos change their flavor (for a nonzero value of θ13), a reduced electron antineutrino flux is observed at the far detector. Detector Setup The target of the Double Chooz detector consists of about 8 tons of a newly developed Gadolinium-loaded liq- uid scintillator. The detection reaction is the inverse beta + decay: ν¯e + p ! n + e . The positron created in this re- action provides a prompt scintillation light signal and car- ries the energy information of the neutrino. The neutron is captured with high probability on the Gd dissolved in Figure 1: Setup of the Double Chooz detectors. the target scintillator with a typical delay time of ∼ 30µs releasing gamma radiation with a total energy of about 8 MeV. This coincidence allows an efficient neutrino de- tection and background reduction.
    [Show full text]