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

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 a threshold $${{E}_{\mu }}$$ {\kern 1.0 \times {\text{sec}}{\kern \theta GeV at Yakutsk array during continuous observations from 1986 to 2016 have been analyzed using events zenith angles θ ≤ 60°. Experimental compared predictions obtained QGSJet-01-d hadron interaction model applying CORSIKA code. The entire dataset indicates that cosmic rays consist predominantly protons.