Some discrepancies have been reported between observed and simulated muon content of extensive air showers: the number of observed muons exceeded the expectations in HiRes-MIA, Yakutsk and Pierre Auger Observatory data. Here, we analyze the data of the Moscow State University Extensive Air Shower (EAS-MSU) array on E µ 10 GeV muons in showers caused by ∼ (10 17 − 10 18 ) eV primary particles and demonstrate that they agree with simulations (QGSJET-II-04 hadronic interaction model) once the primary composition inferred from the surface-detector data is assumed.

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Results of the search for ∼ (10 16 − 10 17.5 ) eV primary cosmic-ray photons with the data of the