Abstract

Chemical composition of PCR were investigated by means of emulsion chambers in several works [1-3]. The conclusion was that the fraction of Fe induced families is less than 3% – 7% and heavy nuclei in primary cosmic rays with energy more than 10 16 eV are less than 0.22 – 0.27. The aim of the present report is to show the origin of sensitivity of γ -hadron families to the atomic number of PCR and review once more the conclusion about normal composition of PCR in the energy interval 10 15 — 10 16 eV.

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