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The HPW proton‐decay experiment

2008 
The Harvard‐Purdue‐Wisconsin water Cherenkow proton‐decay detector is described. Running through early August, 1983, comprises 3.1×106 triggers at a 0.6 Hz rate, and 3.6×106 triggers at 0.7 Hz. Track reconstruction is demonstrated for cosmic‐ray muons. The apparatus records full data for as many as 7 delayed triggers occuring within 32 microseconds of the primary trigger or each other. Such delayed triggers have been used to calibrate the detector on electron‐decays of muons. We discuss the implications of delayed triggers for rapid recognition of certain classes of candidates for nucleon decay, and indicate the present sensitivity of the experiment.
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