Cosmic ray mass composition through Cerenkov technique - a feasibility study

Abstract

Detailed Monte Carlo simulations of atmospheric Cerenkov events, recorded by the 349 - pixel imaging camera of the TACTIC Imaging Cerenkov Telescope array at Mt. Abu, Rajasthan, have been carried out to study the possibility of using the Hillas image and orientation parameters for mass segregation of the primary air shower - initiating particles. Four primary species, namely, gamma rays, protons, Neon and Iron nuclei, with energies above 10 TeV have been considered for the simulations. Our preliminary results indicate that, except for Width, Azwidth and Length parameters, all other image parameters may not provide asignificant segregation of the primary particles in terms of their mass.