arXiv subjects
Publications and source records attributed to A. Razdan.
In this paper we study factorial moments of simulated Cherenkov images of TACTIC type gamma ray telescope for cosmic gamma rays and proton segregation. A comprative and supplemnetary studies between factorial moments and Hillas parameters using ANN is discussed.
Extensive air shower products are fractal in nature. Both simulated and experimental Cherenkov images display multifractal properties. In this paper we explore the possibility of searching multifractal features in Cherenkov arrival times.
Cherenkov images are multifractal in nature. We show that multifractal behaviour of cherenkov images arises due to binomial multiplicative nature of pair production and bremsstahlung processes in the longitudinal shower passage.
In this exploratory simulation study, we compare the event-progenitor classification potential of a variety of measurable parameters of atmospheric Cherenkov pulses which are produced by ultra-high energy (UHE) gamma-ray and hadron progenitors and are likely to be recorded by the TACTIC array of atmospheric Cherenkov telescopes. The parameters derived from Cherenkov images include Hillas, fractal and wavelet moments, while those obtained from non-image Cherenkov data consist of pulse profile rise-time and base width and the relative ultraviolet to visible light content of the Cherenkov event. It is shown by a neural-net approach that these parameters, when used in suitable combinations, can bring about a proper segregation of the two event types, even with modest sized data samples of progenitor particles.