Speaker
Dorota Sobczynska
(University of Lodz)
Description
A system of Imaging Air Cherenkov Telescopes (IACTs) can be triggered by hadronic events containing Cherenkov light from at most two electromagnetic subcascades, which are products of the single $\pi^0$ decay. The recorded images of those showers have a similar shape to the primary $\gamma$-ray events. Therefore, they are hardly reducible background for observations using IACTs.
In this paper, the impact of the single $\pi^0$ events on the efficiency of the $\gamma$/hadron separation was studied using the Monte Carlo simulations. The fractions of events containing the light from single $\pi^0$ in the expected total protonic background depends on the the trigger threshold, reflector area and altitude of the observatory. The calculated quality factors are correlated with the contributions of single $\pi^0$ events in the proton initiated showers with primary energies below 200 GeV. The occurrence of the single $\pi^0$ images is one of the main reasons for the deterioration of the $\gamma$/hadron separation efficiency at low energy.
| Registration number following "ICRC2015-I/" | 0415 |
|---|---|
| Collaboration | -- not specified -- |
Primary author
Dorota Sobczynska
(University of Lodz)
