Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-12-18
Pisma Zh.Eksp.Teor.Fiz.79:175-177,2004
Astronomy and Astrophysics
Astrophysics
5 pages, 4 figures. Contributed talk presented at 28-th ICRC, Thusuba, Aug., 2003; Sem. Inst. Nucl. Phys., Lodz, Oct. 2003; Se
Scientific paper
Arrival directions of extensive air showers by using world data are considered. It is found that the shower distribution in zenith angle at the energies E>10^{19} eV and E>4x10^{19} eV differs from each other. By our estimations, the shower with E>10^{20} eV at the Sugar array was not registered. The mass composition of very high-energy cosmic rays has been estimated. It is shown that E>4x10^{19} eV cosmic rays are, most likely, super heavy nuclei with charge Z>26.
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