Estimate of the Mass Composition of Ultrahigh Energy Cosmic Rays
Mikhailov, A. A. · Efremov, N. N. · Gerasimova, N. S. · Makarov, I. T. · Nikolayeva, G. V. · Struchkov, G. G.
Original · EN
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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