http://arxiv.org/abs/1908.01508
The paper presents the results of the longitudinal development of extensive air showers (X${max}$) of ultra-high energies and mass composition of cosmic rays. The measurements of X${max}$ are based on data from observations of the Cherenkov radiation at the Yakutsk array for the period 1974-2014. The cascade curves of individual showers and the depth of maximum X${max}$ were reconstructed over the energy range 10$^{16}$-5.7$\cdot$10$^{19}$ eV. It is shown that the displacement rate of the parameter dX${max}$ / dE in the atmosphere is nonlinear and depends on the energy. Such a feature indicates a change in mass composition, which is confirmed by fluctuations of X$_{max}$ in this energy region. The composition of cosmic rays was determined by interpolation using the QGSJetII-04 model.
S. Knurenko and I. Petrov
Tue, 6 Aug 19
41/76
Comments: 12 pages, 9 figures, 3 tables, Accepted for publication in Journal of Advances in Space Research
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