18 January 2002CERN - Workshop on Large Detectors - L. R. Sulak1 Comparison of Detectors for Proton Decay L. R. Sulak Boston University overview and “long”

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18 January 2002CERN - Workshop on Large Detectors - L. R. Sulak1 Comparison of Detectors for Proton Decay L. R. Sulak Boston University overview and “long” discussion...

18 January 2002CERN - Workshop on Large Detectors - L. R. Sulak2 physics motivation Giudice theories severely constrained synergism with superbeams, ν factories current status: implications for future our goals? near medium long-term comparison of detector technologies water Cherenkov liquid argon balanced scintillator & Cherenkov oil? new photodetectors Ferenc a “shoot-out” considering competing long-term options “long” discussion... broad brush, round-number overview...

18 January 2002 CERN - Workshop on Large Detectors - L. R. Sulak3 Proton Decay Search, now where are we? where going? Current State...size is everything Goodman Super-K: 3.5 yr  22 kT  80 kT-yr, Soudan at 6 kT-yr IMB still best for most of ~40 modes SK PDK limitse + π o 5  10 33, background 0.2 ν K  10 33, background 2.2 with wide-open cuts for SK...could be  5 x more restrictive Mine, Shiozawa probably no background to 10 yr  0.5 MT IMB ( ) & SK: 10 yr realistic lifetime Near Term Program: Super-K (2003 to ~2007 with 1/2 pms) increase exposure x ~2 statistically improve limits develop improved cuts and reconstruction for Hyper-K find 1-2 proton decay candidates invaluable guide to future detector determine mode to focus on define size of detector set technology study atmospheric ν background to proton decay compare with K2K near detector events Mine (2003: K2K long baseline study of neutrino oscillations)

18 January 2002 CERN - Workshop on Large Detectors - L. R. Sulak4 Proton Decay Search, longer term where are we, where going? continued Medium Term Goal Super-K (between 2007 and 2012 ) proton decay search with original pm density (  2007 JHF 1 superbeam for neutrino properties) Long Term Goal: New Megaton Detector want significant increase of sensitivity x sensitivity = mass x detection efficiency need knowledge of neutrino interactions minimize atmospheric background for linear gain mode focus? K + detection could drive technology Long Term Detector Technology? 1) MT water Cherenkov McGrew, Shiozawa UNO / Hyper-K (also for JHF 2,  2012 Titanic - sunken, water/pm-filled tanker Suzuki 2) liquid argon LANNDD Rubbia, Cline 3) detector with balanced scintillator / Cherenkov oil Svoboda (via Kamyshkov)

18 January 2002 CERN - Workshop on Large Detectors - L. R. Sulak5 PDK Detector Technology: water what are the options? water Cherenkov - low cost/MT underground  Super-K 50 kT  Hyper-K / UNO x 100kT torus no scale-up of Super-K...just repeat array of ~ Super-K tanks horizontal array...low hydrostatic pressure e.g. in Homestake Nat. UG Lab when does cavern size set ultimate limit? undersea embedded, fine grain in Antares, Nestor piggy back on infrastructure 10 GeV threshold veto sufficient? deployment inside existing array feasible? submerged vessel, e.g. Titanic no excavation: dominant time and cost no bioluminescence, sea currents movement raise to surface for maintenance >100m must use pressure-tolerant enclosures under-ice Amanda 50 GeV threshold? diffuse light? spacing?

18 January 2002 CERN - Workshop on Large Detectors - L. R. Sulak6 PDK Detector Technology: Scintillator what are the options, continued? liquid scintillator... 2 options as substitute for water for ν K + 1) high light yield, e.g. Kamland or, 2) doping balanced: e.g. LSND / Miniboone 2003 a) isotropic scintillator for calorimetry and timing signature of K + b) but dilute, Cherenkov not overwhelmed for ring imaging and directionality  ν K + detection efficiency 10%  40% but potential problem: μ/e discrimination tech information to come from Miniboone e. g. electron π o discrimination what if SUSY discovered? what if Super-K gets 1 or 2 candidates for ν K + ? should we fill S-K with dilute scintillator? MT project: $1B/MT oil...show stopper?

18 January 2002 CERN - Workshop on Large Detectors - L. R. Sulak7 PDK Detector Technology: Liq Ar what are the options, continued? liquid argon time projection chamber - Icarus everything charged visible...3 x 3 x 0.6 mm pixels 1/2 of 600T studied at surface 1.5 m drift, achieving 1.8 ms lifetime (vs. 30 ms needed for scaling up) + 2 x 1200T = 3 kT proposed for 2005 in Gran Sasso safety under consideration tech evaluation awaited see pix e.g. reconstruction of stopping muons and decay: vertices of end of muon and beginning of e dE/dx vs. range for stopping muons cross-check with multiple scattering electron energy distribution...Michel LANNDD 70 kT ~6 x better efficiency than water for K + (but not for e + π o)  420 kT effective (8 x Super-K total) moderate cost: $200 M for the liquid proposal site: WIPP underground facility

18 January 2002 CERN - Workshop on Large Detectors - L. R. Sulak8 Reach 4x better than Super-K years Technology Strong Scintillation Scintillator balanced w/ Cherenkov Liquid Argon Water Cherenkov underground Water Cherenkov in sea Current detector Kamland 1KT LSND Icarus 0.3kT Super-K 50KT Proposal detector ---Miniboone LANNDD 70kT Hyper-K and UNO Titanic Scale Factor ~200 (x7 IMB  SK)  ν K + Detection Efficiency CostHigh Medium Excavation: Time & $ ? Pros calorimetry on all charged particles Directionality Superb detail; 6x better for νK + Mature technology, going since 1981 get > 2MT reach atm ν e + π o limit? Cons Single Goal...ν K + no direction Single Goal...ν K +  / e id Safety cost to be proven Limited by cavern size Unknown technology, pm pressure Proton Decay Detector “Shoot-Out”

18 January 2002CERN - Workshop on Large Detectors - L. R. Sulak9 physics motivation strong for PDK search theories severely constrained synergism with superbeams, ν factories next goals detailed understanding of neutrino bkgnd vigorous r & d for detector options...decision only after questions answered if e + π o 1 candidate, oil in Super-K? then big water detector? if SUSY, look for ν K + economy determines detector some open questions on detector technology water Cherenkov: ultimate atmospheric background level? can biggest underground cavern reach it? is liquid argon scalable a factor of 200? summary... “long” discussion...