Cosmic Ray Energy Spectrum and Mass Composition from 1015 to 1017 eV by Data of the Tunka EAS Cherenkov Array
Abstract
We present results of an improved analysis of the experimental data of the EAS Cherenkov array Tunka-25. A new function to fit the Cherenkov light lateral distribution LDF at core distances from 0 to 350 m has been developed on the base of CORSIKA simulations and applied to the analysis of Tunka data. Two methods to estimate the EAS maximum position have been used. The one is based on the pulse FWHM, the other on the light LDF. We present the primary energy spectrum in the energy range 1015 - 1017 eV. The use of the depth of the EAS maximum to determine the mean mass composition is discussed.
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