Estimate of the Mass Composition of Ultrahigh Energy Cosmic Rays
A. A. Mikhailov, N. N. Efremov, N. S. Gerasimova, I. T. Makarov, G. V. Nikolayeva, G. G. Struchkov
Abstract
It is proposed a new approach for estimating the composition of cosmic rays. It is found that the zenith angle distributions and muon components of EAS for energies E>1019 eV and E>4.1019 eV differ from each other. It is shown that the cosmic rays above E>4.1019 eV is heavier than the cosmic rays at energy E~ 1019 eV. According to our estimation the SUGAR array detected 8 showers above 1020 eV. It is concluded that no sign of Greisen-Zatsepin-Kuzmin (GZK) cut off in the spectrum of cosmic rays and all cosmic rays are galactic.
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