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- W3123800141 abstract "The γ/hadron separation in the imaging air Cherenkov telescope technique is based on differences between images of a hadronic shower and a γ induced electromagnetic cascade. One may expect for a large telescope that a detection of hadronic events containing Cherenkov light from one γ subcascade only is possible. In fact, simulations show that for the MAGIC telescope their fraction in the total protonic background is about 1.5% to 5.2% depending on the trigger threshold. It has been found that such images have small sizes (mainly below 400 photoelectrons) which correspond to the low energy primary γ's (below 100 GeV). It is shown that parameters describing shapes of images from one subcascade have similar distributions to primary γ events, so those parameters are not efficient in all methods of γ selection. Similar studies based on MC simulations are presented also for the images from 2γ subcascades which are products of the same π0 decay. The ratio of the number of the expected background from false γ and one π0 to the number of the triggered high energy photons from the Crab direction has been estimated for images with a small alpha parameter to show that the occurrence of this type of protonic shower is the reason for the difficulties with true γ selection at low energies." @default.
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- W3123800141 date "2007-10-09" @default.
- W3123800141 modified "2023-10-17" @default.
- W3123800141 title "Natural limit on the γ/hadron separation for a stand alone air Cherenkov telescope" @default.
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- W3123800141 doi "https://doi.org/10.1088/0954-3899/34/11/005" @default.
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