MINOS Document 842-v1

MINOS Far Detector Gamma Background and Rate Prediction

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John Urish
Updated by:
John Urish
Document Created:
02 Jul 2002, 12:00
Contents Revised:
02 Jul 2002, 12:00
Metadata Revised:
02 Jul 2002, 12:00
Actually Revised:
08 Sep 2006, 21:19
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A measurement of the gamma ray background in the MINOS Far Detector
Hall is combined with a Monte Carlo simulation to predict both
one-ended and two-ended singles rates per scintillator strip.
Single-ended rate predictions range from 1.5 kHz per plane of 192 strips
(28 Hz per square meter) for centrally (effectively shielded) planes to
11 kHz per plane (210 Hz per square meter) for the first and last plane
of the detector. Typically 25-30% of gamma events are predicted to be
seen by photomultipliers at both ends of the scintillator strip (i.e.
intrastrip coincidence). For a trigger requiring 2 hits in 36 adjacent
planes (single sided readout), the simulation predicts a 4 kHz rate for
a supermodule of 248 planes. The MC also predicts a singles rate of
350 Hz per square meter for an unshielded scintillator module located up
against a wall, ceiling, or floor, as might be implemented in a veto

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