-We describe a proposed nucleon decay detector able to demonstrate 32 the existence of nucleon decay for lifetimes up to 5 x 10 yr. The proposed instrunent is a self-vetoed conpletely-active 1400-ton liquid scintillation Tracking Spectrometer to be located in the Honestake Mine at a depth of 4200 nwe, where the cosmic ray 2 ' 7 muon flux is only 1100/n /yr, more than 10 times lower than the flux at the earth's surface.' Based on computer simulations and laboratory measurements, the Tracking Spectrometer will have a spatial resolution of + 15 cm (0.32 radiation lengths); energy resolution of ± 4.22; and time resolution of ^ 1.3 ns-Because liquid scintillator responds to total ionization energy, all neutrinoless nucleon decay modes will produce a sharp (+ 4.2%) total energy peak at approximately 933 MeV, thereby allowing clear separation of nucleon decay events froa atmospheric neutrino and other backgrounds. The instrument will be about equally sensitive to most nucleon decay modes. It will be able to identify most of the likely decay modes (including n-* if + K, as suggeste 1 S supcrsymnetric grand unified theories ), as well as detenu! the charge of lepton secondaries and the polarization of sec nuons.
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