Muon Content of Extensive Air Showers: Comparison of the Energy Spectra Obtained by the Sydney University Giant Air-Shower Recorder and by the Pierre Auger Observatory


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Abstract

The Sydney University Giant Air-shower Recorder(SUGAR) measured the energy spectrum of ultra-high-energy cosmic rays reconstructed from muon detector reading. Comparison of their spectra SUGAR and Pierre Auger Observatory allows us to reconstruct the empirical dependence of the number of muons in a vertical shower on the primary energy for energies between 1017 and 1018 eV. We compared this dependence with the predictions of hadronic interaction models QGSJET-II-04, EPOS-LHC and SIBYLL-2.3c. In addition, we analyzed the response of the array of muon detectors in order to determine the slope of the muon lateral distribution function. It is important to understand how much the number of muons differs from the predictions of modeling at different distances from the shower axis.

About the authors

I. S. Karpikov

Institute for Nuclear Research of the Russian Academy of Sciences, 60th October Anniversary Prospect 7a

Author for correspondence.
Email: karpikov@inr.ru
Russian Federation, Moscow, 117312

J. A. Bellido

Physics Department

Email: karpikov@inr.ru
Australia, Adelaide, SA, 5005

R. W. Clay

Physics Department

Email: karpikov@inr.ru
Australia, Adelaide, SA, 5005

N. N. Kalmykov

D. V. Skobeltsyn Institute of Nuclear Physics

Email: karpikov@inr.ru
Russian Federation, Moscow, 119991

G. I. Rubtsov

Institute for Nuclear Research of the Russian Academy of Sciences, 60th October Anniversary Prospect 7a

Email: karpikov@inr.ru
Russian Federation, Moscow, 117312

S. V. Troitsky

Institute for Nuclear Research of the Russian Academy of Sciences, 60th October Anniversary Prospect 7a

Email: karpikov@inr.ru
Russian Federation, Moscow, 117312

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