Search for Proton Decay - The HPW
The data gathering and background characteristics of a totally sensitive 850 ton Water Cerenkov Detector containing some 5 ´ 1032 nuclei and located at a depth of 1700 mwe in the Silver King Mine in Park City, Utah is described. The device contains 704 5” PMT’s located throughout its volume with a density of ~ 1 PMT/m3, and is surrounded with an active shield made from 6 m proportional wire tubes. The detector is optimized to be sensitive to the principle decay modes predicted by Grand Unified Theories, and to suppress the backgrounds that are associated with cosmic ray muon and neutrino interactions occurring both in the detector and in the surrounding rock. Using the Cerenkov light patterns from the proton decay products, the timing sequence and pulse height of the hit PMT’s allow nucleon decays to be separated from backgrounds to a lifetime limit of 4 x 1032 years in about 3 years of running. Data taking will start about June 1982.
KeywordsAttenuation Ozone Polyethylene Smoke Calorimetry
Unable to display preview. Download preview PDF.