Local Muon Density Spectra at Various Zenith Angles Measured with NEVOD-DECOR


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Data on cosmic ray muon bundles accumulated at the NEVOD-DECOR complex over the period from May 2012 to December 2018 have been analyzed. Local muon density spectra at various zenith angles have been reconstructed and compared with CORSIKA-based simulations. At large zenith angles and high muon multiplicities corresponding to primary particle energies more than about 3 × 1017 eV an excess of multi-muon events compared to simulations is clearly seen. Present data are compatible with the expectation for recent LHC-adjusted hadron interaction models only under assumption of extremely heavy (iron group nuclei) primary composition. The assumption of a heavy composition is however in contradiction with other EAS observables, such as maximum depth and its fluctuations.

Sobre autores

R. Kokoulin

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Autor responsável pela correspondência
Email: rpkokoulin@mephi.ru
Rússia, Moscow

A. Bogdanov

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: rpkokoulin@mephi.ru
Rússia, Moscow

G. Mannocchi

Osservatorio Astrofisico di Torino—INAF

Email: rpkokoulin@mephi.ru
Itália, Torino

A. Petrukhin

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: rpkokoulin@mephi.ru
Rússia, Moscow

V. Shutenko

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: rpkokoulin@mephi.ru
Rússia, Moscow

G. Trinchero

Osservatorio Astrofisico di Torino—INAF

Email: rpkokoulin@mephi.ru
Itália, Torino

I. Yashin

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: rpkokoulin@mephi.ru
Rússia, Moscow

E. Yurina

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: rpkokoulin@mephi.ru
Rússia, Moscow

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