Estimate of the Mass Composition of Ultrahigh Energy Cosmic Rays

Details Estimate of the Mass Composition of Ultrahigh Energy Cosmic Rays Estimate of the Mass Composition of Ultrahigh Energy Cosmic Rays

2005-07-28

arxiv.org/abs/astro-ph/0507681v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, the paper will be publish in Proc. ICRC, Pune, India, 2005

Scientific paper

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>10^19 eV and E>4.10^19 eV differ from each other. It is shown that the cosmic rays above E>4.10^19 eV is heavier than the cosmic rays at energy E~ 10^19 eV. According to our estimation the SUGAR array detected 8 showers above 10^20 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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