Does the GAMMA experiment detect the polar cap component at energies 70-80 PeV?

The all-particle energy spectrum of the primary cosmic rays at energies 1-200 PeV has been obtained on the basis of the GAMMA experimental data using the event-by-event method of the primary energy evaluation from the measured Nch, Nμ and shower age (s) parameters. The energy estimation method was developed using the CORSIKA simulation code in the frames of the SIBYLL interaction model taking into account the response of the GAMMA detectors and the reconstruction uncertainties of the EAS parameters. The observed ‘bump’ at ∼7.4⋅107 GeV can be described by a two-component model of primary cosmic ray origin.