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

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 mult...

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Bibliographic Details
Published in:Physics of atomic nuclei 2019-11, Vol.82 (6), p.657-662
Main Authors: Kokoulin, R. P., Bogdanov, A. G., Mannocchi, G., Petrukhin, A. A., Shutenko, V. V., Trinchero, G., Yashin, I. I., Yurina, E. A.
Format: Article
Language:English
Subjects:
Analysis
Composition
Computer simulation
Cosmic rays
Density
Elementary Particles and Fields
Interaction models
Muons
Particle and Nuclear Physics
Physics
Physics and Astronomy
Specific gravity
Variations
Zenith
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Summary: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 × 10 17 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.
ISSN:1063-7788
1562-692X
DOI:10.1134/S1063778819660293