Abstract

The distribution of energy fluxes of the hadron component of extensive air showers through an ion-ization calorimeter in the primary-energy range ∼3 × 1013−1016 eV is considered. Extensive air showers with zero and minimum energy fluxes of the hadron component are selected. It is concluded that the primary-energy range E 0 ≈ 1 × 1014−2 × 1015 eV contains isotropic γ radiation with a spectrum close to bell-shaped, having a maximum near E 0 ≈ 2.2 × 1014 eV and an additional peak near E 0 ≈ 1.6 × 1015 eV.

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