Abstract
Results of a global analysis of data from the Yakutsk array and AGASA are presented. The zenith-angle dependences ρs,600(θ) and ρμ,600(θ) of the densities of all charged particles and muons (the threshold energy is E μ ≈ 1.0·secθ GeV) at a distance of 600 m from the axis of giant air showers (GAS) of energies E0≥1019 eV are considered. These dependences are compared with the results of the calculations based on the QGSJET model and performed for the case of primary protons. The results of the calculations within this model agree well with data from both arrays at E0≤2×1018 eV, but they are in a glaring contradiction with GAS data. The experiments indicate that the lateral structure of showers changes at E0≥(3–5)×1018 eV. In all probability this is due to some new processes accompanying their evolution. The neglect of this fact can lead to considerably overestimating the GAS energy (by a factor of 1.5–2.5).
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