A method for restoring the high energy cosmic rays mass composition (1-100 PeV) based on attribution mass for each shower event using the SPHERE-2 Cherenkov radiation detector is presented. To estimate the errors in determining the mass, the simulated events of extensive air showers Cherenkov light without taking into account the background of the night sky was used. To simulate artificial events, various models of the nucleus-nucleus interaction are used, the predictions of which can differ markedly. The mass restoring procedure is based on two models of hadronic interaction, which are very different from each other in the energy range of 1–100 PeV. These are the QGSJET-01 and QGSJETII-04 models. Thus, the independence of data processing from the choice of the nuclear interaction model is ensured. The developed method for restoring the mass composition can be applied to any experiment of the SPHERE type.
96.50.sd Extensive air showers
$^1$Physics Department, M.V. Lomonosov Moscow State University
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