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VOLUME 100 (2014) | ISSUE 11 | PAGE 797
Estimates of the cosmic gamma-ray flux at PeV to EeV energies from the EAS-MSU experiment data
DOI: 10.7868/S0370274X14230039
Abstract
Archival EAS-MSU data are searched for anomalous muonless events which may be caused by primary gamma rays with energies between 1015 and 1018 eV. We consider a refined sample of high-quality data and confirm the previously reported detection of a non-zero gamma-ray flux at {\sim} 5\cdot10^{16} eV with a similar flux value but at somewhat lower statistical significance, corresponding to a depletion of the sample. We present upper limits on the flux below and above these energies, including the first constraints in the range 1016.5 -1017.5 eV never studied by any other experiment.