Muons in EASs with E0 = 1019 eV According to Data of the Yakutsk Array

Abstract

Lateral distribution functions of particles in extensive air showers with the energy $${{E}_{0}} \approx {{10}^{{19}}}{\kern 1pt} $$ eV recorded by ground-based and underground scintillation detectors with a threshold of $${{E}_{\mu }}$$$$ \approx {\kern 1pt} 1.0 \times {\text{sec}}{\kern 1pt} \theta $$ GeV at the Yakutsk array during the continuous observations from 1986 to 2016 have been analyzed using events with zenith angles θ ≤ 60°. Experimental functions have been compared to the predictions obtained with the QGSJet-01-d hadron interaction model by applying the CORSIKA code. The entire dataset indicates that cosmic rays consist predominantly of protons.