ESTIMATE OF THE FRACTION OF PRIMARY PHOTONS IN THE COSMIC-RAY FLUX AT ENERGIES eV FROM THE EAS-MSU EXPERIMENT DATA
Fomin Yu.A., Kalmykov N.N., Kulikov G.V., Sulakov V.P., Troitsky S.V.

Received: May 27, 2013

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We reanalyze archival EAS-MSU data in order to search for events with an anomalously low content of muons with energies E_{μ. We confirm the first evidence for a nonzero flux of primary cosmic gamma rays at energies eV. The estimated fraction of primary gamma rays in the flux of cosmic particles with energies eV is %, which corresponds to the intensity . The study of arrival directions does not favor any particular mechanism of the origin of the photon-like events.}