Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997japa...18..151c&link_type=abstract
Journal of Astrophysics and Astronomy, Vol. 18, p.151
Astronomy and Astrophysics
Astronomy
5
Vhe Gamma-Ray Astronomy-Technique
Scientific paper
It is shown that parameters of flashes, detected by multi-channel 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.
Chalenko N. N.
Kalekin O. R.
Neshpor Yu I.
Stepanian A. A.
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