Abstract
The number of low-energy muons (Emu <or=1 GeV) in EAS initiated by primary gamma rays of extremely high energies is calculated. It is shown that at large depths (z>or=1000 g cm-2) the number of low-energy muons in EAS from gamma rays with energy E0>or=1018 eV is of the same order as in the proton-induced shower, as opposed to the energy range E0 approximately 1015 eV, where the gamma showers are 'muon-poor'. The influence of the Landau-Pomeranchuk-Migdal effect and of the interaction of the primary photon with the geomagnetic field on the development of an electromagnetic shower in the Earth's atmosphere at energies E0>or=1019 eV is investigated. In case of a high content of gamma rays in the primary cosmic radiation ( gamma / rho >0.1) one should not ignore these effects when interpreting data on EAS of extremely high energies.
Published Version
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