Estimate of the Mass Composition of Ultrahigh Energy Cosmic Rays
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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