Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....3.1318z&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
We describe a 1 Mt water volume in form of a RICH detector suitable for detection of NNN (Neutrinos, Nucleon decay and superNovae). It has a 124 m diameter outer geodesic dome supporting 3000 inward facing, 1 m diameter hybrid photo diodes mHPDs (3.5% cover) each with 512 pixels of 40 x 40 mm2 looking through transparent holes in a 124 m diameter spherical mirror balloon. An inner geodesic dome of 62 m diameter supports 3800 outward facing dHPDs (25% cover). The dHPDs see focused Cherenkov rings which give the best pattern recognition and determine particle momentum from multiple scattering. The mHPDs determine the direction of tracks and their vertex point in space. The photon energy acceptance of mHPDs is 5 times that of dHPDs thus they both detect about 200 photons per meter tracklength. This device can detect about 30000 atmospheric neutrinos per year, be sensitive to proton decay with lifetime > ˜ 6.2 · 1035 years and detect supernovae out to a radius of 1 Mpc (includes Andromeda). The algorithms and calculations to determine particle momentum, direction and vertex as well as the current status will be presented. 1 Physics motivation With the growing evidence for massive neutrinos (for recent reviews see Zuber (1998)) coming from atmospheric neutrino data, solar neutrinos and the LSND experiment, prospects to explore the physics beyond the standard model in form of GUT-theories should be attacked again. One process always considered within this context is proton decay. Early predictions of non-supersymmetric minimal SU(5) resulted in life-times of about 1028 yrs for a decay mode p → e+ π0 , which is ruled out by current Super-K data of τ/BR(p → e+ π0 ) > 1.6 · 1033 yrs with 90 % CL Shiozawa (1999). Other models emerged favouring now the decay mode p → ¯νK+ , where Super-K gives a limit of τ/BR(p → ¯νK+ ) >
Aqua-Rich Project
Zuber Kai
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