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Estimating the fraction of gamma quanta in the primary cosmic ray flux with energies of ∼1017 eV from the MSU EAS array data

  • Proceedings of the 32nd All-Russia Conference on Cosmic Rays
  • Published:
Bulletin of the Russian Academy of Sciences: Physics Aims and scope

Abstract

Using data from the MSU EAS array and model calculations, we search for events with abnormally small fractions of muons with energies above 10 GeV in showers with particle numbers of >2 × 107 and zenith angles of <30 degrees. We confirm with good statistical accuracy that the content of gamma quanta in the primary cosmic ray flux can be as high as 2% at energies of ∼1017 eV.

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Authors and Affiliations

  1. Skobel’tsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119991, Russia

    N. N. Kalmykov, G. V. Kulikov, V. P. Sulakov & Yu. A. Fomin

Authors
  1. N. N. Kalmykov
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  2. G. V. Kulikov
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  3. V. P. Sulakov
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  4. Yu. A. Fomin
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Corresponding author

Correspondence to Yu. A. Fomin.

Additional information

Original Russian Text © N.N. Kalmykov, G.V. Kulikov, V.P. Sulakov, Yu.A. Fomin, 2013, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2013, Vol. 77, No. 5, pp. 695–697.

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Kalmykov, N.N., Kulikov, G.V., Sulakov, V.P. et al. Estimating the fraction of gamma quanta in the primary cosmic ray flux with energies of ∼1017 eV from the MSU EAS array data. Bull. Russ. Acad. Sci. Phys. 77, 626–628 (2013). https://doi.org/10.3103/S1062873813050250

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  • DOI: https://doi.org/10.3103/S1062873813050250

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