Gamma quanta with energy ≈ 10¹⁵eV in the primary cosmic radiation

Abstract

Extensive air shower (EAS) experimental data have been analysed, as registered by the Tien Shan array during an effective running time of 17951 h. It is shown on the basis of EAS, with few muons with energy Emu >5 GeV and in high energy hadrons, that there exist gamma quanta in the primary cosmic radiation at energies approximately 1015 eV. The primary gamma-quanta flux is estimated as Igamma (>4*1014 eV)=(3.4+or-1.2)*10-13 cm-2 s-1.