Homestake tracking spectrometer: a one-mile deep 1400-ton liquid-scintillation nucleon-decay detector

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We describe a proposed nucleon decay detector able to demonstrate the existence of nucleon decay for lifetimes up to 5 x 10/sup 32/ yr. The proposed instrument is a self-vetoed completely-active 1400-ton liquid scintillation Tracking Spectrometer to be located in the Homestake Mine at a depth of 4200 mwe, where the cosmic ray muon flux is only 1100/m/sup 2//yr, more than 10/sup 7/ 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 +- 4.2%; and ... continued below

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Pages: 16

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Cherry, M.L.; Davidson, I.; Lande, K.; Lee, C.K.; Marshall, E.; Steinberg, R.I. et al. January 1, 1982.

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Description

We describe a proposed nucleon decay detector able to demonstrate the existence of nucleon decay for lifetimes up to 5 x 10/sup 32/ yr. The proposed instrument is a self-vetoed completely-active 1400-ton liquid scintillation Tracking Spectrometer to be located in the Homestake Mine at a depth of 4200 mwe, where the cosmic ray muon flux is only 1100/m/sup 2//yr, more than 10/sup 7/ 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 +- 4.2%; 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 938 MeV, thereby allowing clear separation of nucleon decay events from 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 ..-->.. ..nu.. + K/sub s//sup 0/ as suggested by supersymmetric grand unified theories), as well as determine the charge of lepton secondaries and the polarization of secondary muons.

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Pages: 16

Notes

NTIS, PC A02/MF A01.

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  • 3. workshop on grand unification, Chapel Hill, NC, USA, 15 Apr 1982

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  • Other: DE82017614
  • Report No.: BNL-31350
  • Report No.: CONF-820466-2
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 5308736
  • Archival Resource Key: ark:/67531/metadc1066677

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  • January 1, 1982

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  • Feb. 4, 2018, 10:51 a.m.

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  • April 4, 2018, 12:09 p.m.

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Cherry, M.L.; Davidson, I.; Lande, K.; Lee, C.K.; Marshall, E.; Steinberg, R.I. et al. Homestake tracking spectrometer: a one-mile deep 1400-ton liquid-scintillation nucleon-decay detector, article, January 1, 1982; United States. (digital.library.unt.edu/ark:/67531/metadc1066677/: accessed May 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.