Abstract
In this paper, we discuss the possibility of excluding the cosmic ray background in gamma ray telescope experiments using the Čerenkov photons arrival time. A method to distinguish proton and iron from gamma induced showers of energies around 50 TeV is presented. A total number of 300 simulated showers are analysed one by one and a distinction method is developed. The simulations were performed with the program CORSIKA and a detailed simulation of the telescope is applied to the surviving Čerenkov photons. Two different shapes of telescopes are tested: parabolic and Davies-Cotton, and the superiority of the parabolic mirrors concerning time information is illustrated.
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