Physics – Instrumentation and Detectors
Scientific paper
2005-03-05
Nucl.Instrum.Meth.A545:225-233,2005
Physics
Instrumentation and Detectors
Submitted to NIM A
Scientific paper
10.1016/j.nima.2005.01.319
In low background and low threshold particle astrophysics experiments using observation of Cherenkov or scintillation light it is common to use pairs or arrays of photomultipliers operated in coincidence. In such circumstances, for instance in dark matter and neutrino experiments, unexpected PMT noise events have been observed, probably arising from generation of light from one PMT being detected by one or more other PMTs. We describe here experimental investigation of such coincident noise events and development of new techniques to remove them using novel pulse shape discrimination procedures. When applied to data from a low background NaI detector with facing PMTs the new procedures are found to improve noise rejection by a factor of 20 over conventional techniques, with significantly reduced loss of signal events.
Carson J. M.
Kudryavtsev Vitaly A.
Lightfoot P. K.
Robinson Michael
Spooner Neil J. C.
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