Results from the GAMMA experiment on Mt. Aragats
Romen Martirosov, Aleksander Garyaka, Samvel Ter-Antonyan, Anatoly, Erlykin, Natalya Nikolskaya, Yves Gallant, Lawrence Jones, Jacques Procureur,, Hovhannes Babayan

TL;DR
The GAMMA experiment on Mt. Aragats studied cosmic rays above the knee, revealing a variable power-law spectrum and irregularities around 70-80 PeV, supporting a two-component model including pulsar-origin Fe components.
Contribution
This paper provides new measurements of cosmic ray composition and spectrum above the knee, highlighting spectral irregularities and supporting a two-component primary cosmic ray model.
Findings
The energy spectrum becomes flatter above 20 PeV.
Irregularities observed at 70-80 PeV suggest additional components.
A two-component model with pulsar Fe contributions explains the spectrum features.
Abstract
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.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsGeophysics and Gravity Measurements · Geomagnetism and Paleomagnetism Studies · Spacecraft and Cryogenic Technologies
