Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-10-29
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Invited talk presented at the XVI International Symposium on Very High Energy Cosmic Ray Interactions, ISVHECRI 2010, Batavia,
Scientific paper
The present status of the GAMMA facility consisting of an enlarged surface EAS array (116 of 1 m^2 scintillation detectors) and underground muon carpet (150 m^2 detectors) is described. The recent results on mass composition and energy spectrum at the energy region above the knee obtained on the basis of the GAMMA experimental data are presented. It is shown that the power law after the knee is not invariable like -3.1. The slope of the energy spectrum becomes more flat at E0>20 PeV. The strong irregularities of the energy spectrum at about 70-80 PeV are discussed in comparison with other experiments. The bump can be described by a two-component model of primary cosmic ray origin, where additional (pulsar) Fe components are included with a very flat power law energy spectrum.
Babayan Hovhannes
Erlykin Anatoly
Gallant Yves
Garyaka Aleksander
Jones Lawrence
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