Gamma-ray families with halos: Main characteristics and possibilities of using them to estimate the p+He fraction in the mass composition of cosmic rays at energies 1–100 PeV
1 P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia
2 Institute for Nuclear Research, Russian Academy of Sciences, Moscow, Russia
a e-mail: email@example.com
Published online: 26 June 2017
Characteristics of γ-ray families with halos (XREC, Pamir) and data of experiments with EAS are analyzed to estimate the proton and helium (p+He) fractions in the primary cosmic radiation at E0 = 1–100 PeV. It is shown that at energies E0 ∼ 1–100 PeV the fraction of p+He remains significant, namely, the fraction of p+He is near 40% at E0 = 10 PeV.
© The Authors, published by EDP Sciences 2016
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