Mass composition of cosmic rays determined by muon fraction with $varepsilon_{thr.} geq$ 1 GeV in air showers with energy greater than 5 EeV. (arXiv:2007.08135v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Knurenko_S/0/1/0/all/0/1">Stanislav Knurenko</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Petrov_I/0/1/0/all/0/1">Igor Petrov</a>
The ratio of the number of muons with a threshold of 1 GeV and charged
particles at a distance of 600 m from the axis is analyzed. Air showers with
energies above 5 EeV and zenith angles with less than 60 degrees are
considered. Comparison of experimental data with calculations by the
QGSJETII-04 model for various primary nuclei, including a gamma ray, showed
that the mass composition of cosmic rays up to energies of $sim$ 10 EeV mainly
consists of protons and helium nuclei, with a small number of heavy nuclei.
Data include air showers with a very low muon content, which are assumed to be
produced by primary gamma rays.
The ratio of the number of muons with a threshold of 1 GeV and charged
particles at a distance of 600 m from the axis is analyzed. Air showers with
energies above 5 EeV and zenith angles with less than 60 degrees are
considered. Comparison of experimental data with calculations by the
QGSJETII-04 model for various primary nuclei, including a gamma ray, showed
that the mass composition of cosmic rays up to energies of $sim$ 10 EeV mainly
consists of protons and helium nuclei, with a small number of heavy nuclei.
Data include air showers with a very low muon content, which are assumed to be
produced by primary gamma rays.
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