MUONS WITH Eth ≥ 1 GeV AND MASS COMPOSITION IN THE ENERGY RANGE 10 18 − 10 20 eV OBSERVED BY YAKUTSK EAS ARRAY

• Main Authors: S. P. Knurenko, V. A. Kolosov, I. T. Makarov, I. Ye. Sleptsov, V. R. Sleptsova, G. G. Struchkov
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2004
• Subjects: Cosmic Rays; Extensive Air Showers; Mass Composition. 1. A Portion of Muons with Eth ≥ 1 GeV; Yakutsk
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.254.9726; http://arxiv.org/pdf/astro-ph/0411683v1.pdf

In this work the dependence of the ratio muon flux density to charged particle flux density at distances of 300, 600 m from the shower axis ρµ(300)/ρµ(300) and ρµ(600)/ρs(600) has been obtained. Separately the dependence ρµ(1000) on the energy in showers with E0 ≥ 10 18 eV is analysided. The comparison of experimental data with calculations by the QGSJET model in the case of primary proton, iron nuclei and gamma – ray is given. The conclusion that showers with E0 ≥ 3 · 10 18 eV can be formed by light nucleus with the pronounced fraction of protons and helium nucleus is made. It is not excluded that a small part of showers with E0 ≥ 10 19 eV can be initiated by primary gamma – rays.