Zenith-angle dependence of local muon density spectra of extensive air shower near the horizon

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Resumo

The integral local muon density spectra (LMDS) of EAS at large zenith angles were reconstructed on the basis of the DECOR experimental data on muon bundles detected in a long-term measurement series from 03.05.2012 to 04.07.2023. The results were obtained for two threshold muon density values of 0.015 and 0.068 particles/m2, corresponding to the detection of bundles with a multiplicity of at least 3 and at least 5 muons in the detector. At zenith angles less than 80°, the zenith-angle dependence of LMDS is well described by a power function of the zenith angle cosine. However, with a further increase in the zenith angle, this dependence changes significantly, and at angles of 87–88°, the measured values exceed the specified simple extrapolation by about an order of magnitude. This is due to the inapplicability of the flat atmosphere approximation at such angles. A simple formula has been obtained that takes into account the curvature of the Earth's atmosphere.

Sobre autores

R. Kokoulin

National Research Nuclear University MEPhI

Moscow, Russia

N. Barbashina

National Research Nuclear University MEPhI

Moscow, Russia

A. Bogdanov

National Research Nuclear University MEPhI

Email: agbogdanov@mephi.ru
Moscow, Russia

V. Vorobev

National Research Nuclear University MEPhI

Moscow, Russia

E. Zadeba

National Research Nuclear University MEPhI

Moscow, Russia

V. Kindin

National Research Nuclear University MEPhI

Moscow, Russia

K. Kompaniets

National Research Nuclear University MEPhI

Moscow, Russia

A. Konovalova

National Research Nuclear University MEPhI

Moscow, Russia

K. Mannanova

National Research Nuclear University MEPhI

Moscow, Russia

A. Petrukhin

National Research Nuclear University MEPhI

Moscow, Russia

I. Troshin

National Research Nuclear University MEPhI

Moscow, Russia

S. Khokhlov

National Research Nuclear University MEPhI

Moscow, Russia

V. Shutenko

National Research Nuclear University MEPhI

Moscow, Russia

E. Yurina

National Research Nuclear University MEPhI

Moscow, Russia

I. Yashin

National Research Nuclear University MEPhI

Moscow, Russia

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