Change of primary cosmic radiation nuclear composition in the energy range 1015 - 1017 eV
Abstract
The dependence Eh (Ne) of Extensive Air Shower (EAS) hadronic component energy flux on the number Ne of particles in EAS is investigated in the primary energy range of the order of 1015 - 1017 eV. The work was aimed at checking the existence of irregularities of Eh (Ne)/Ne behavior at these energies in several independent experiments. The investigation is carried out using large statistical material obtained at different configurations of experimental apparatus and under different triggering conditions. The existence of irregularities of Eh (Ne)/Ne behavior in the region Ne > 2*106 is confirmed. These irregularities have the character of sharp deeps and are located near the same values of Ne regardless of the experimental material and selection conditions used. So, at recent stage of research the existence of these irregularities of Eh (Ne)/Ne behavior in the range of Ne > 2*106 may be regarded as reliably established. This fact supports our earlier conclusion on the existence of primary cosmic radiation (PCR) nuclei spectra cutoff effect in the primary energy region 1015 - 1017 eV.
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