The effective technique of the charged particles background discrimination in the atmospheric Cherenkov light detectors

It is shown that parameters of flashes, detected by multichannel image cameras of Cherenkov detectors with closed lids are close to those of Cherenkov flashes initiated by VHE gamma-quanta in the Earth atmosphere. Even after application of criteria for gamma-like events selection a considerable part...

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Published in:Journal of astrophysics and astronomy 1997-09, Vol.18 (2-3), p.151-159
Main Authors: Chalenko, N. N., Kalekin, O. R., Yu, I. Neshpor, Stepanian, A. A.
Format: Article
Language:English
Subjects:
Astrophysics
Atoms & subatomic particles
Cameras
Cerenkov counters
Charged particles
Detectors
Earth atmosphere
Scintillation counters
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description It is shown that parameters of flashes, detected by multichannel image cameras of Cherenkov detectors with closed lids are close to those of Cherenkov flashes initiated by VHE gamma-quanta in the Earth atmosphere. Even after application of criteria for gamma-like events selection a considerable part of those flashes may be misclassified and accepted as gammas. Since the flashes of this kind are detected also during normal measurements with the opened lids of image cameras it just increases the background and, as a consequence, decreases the detector sensitivity even when one uses an anticoincidence scintillator shield around the camera (its efficiency is about 75 %). The use of detectors consisting of two (or more) sections no less than 20-30 m apart permits us to avoid the detection of both muon and local charged particles flashes in the course of observations.[PUBLICATION ABSTRACT]
doi_str_mv 10.1007/BF02714876
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subjects Astrophysics
Atoms & subatomic particles
Cameras
Cerenkov counters
Charged particles
Detectors
Earth atmosphere
Scintillation counters
title The effective technique of the charged particles background discrimination in the atmospheric Cherenkov light detectors
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