Muon excess in ultra-high energy inclined EAS according to the NEVOD-DECOR data

Кокоулин, Р. П.; Barbashina, N. S.; Bogdanov, A. G.; Хохлов, С. С.; Киндин, В. В.; Компаниец, К. Г.; Mannocchi, G.; Петрухин, А. А.; Шутенко, В. В.; Trinchero, G.; Yashin, I. I.; Yurina, E. A.; Zadeba, E. A.

doi:10.22323/1.395.0381

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Local Muon Density Spectra1

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2023

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“…The local muon density spectra are used as a frontier between the experiment and calculations. The main stages of data analysis on the local muon density are described in detail in [3][4][5].…”

Section: Local Muon Density Spectramentioning

confidence: 99%

Muon puzzle in inclined muon bundles detected by NEVOD-DECOR

Bogdanov,

Barbashina,

Khokhlov

et al. 2023

SciPost Phys. Proc.

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The data of cosmic ray NEVOD-DECOR experiment on the investigation of inclined muon bundles for a long time period (May 2012 - March 2021) are presented. The analysis showed that the observed intensity of muon bundles at primary cosmic ray energies of about 1 EeV and higher can be compatible with the expectation in frame of widely used hadron interaction models only under the assumption of an extremely heavy mass composition. This conclusion is consistent with data of several experiments on investigations of muon content in air showers, but contradicts the available fluorescence data on X_{max}Xmax which favor a light mass composition at these energies. In order to clarify the nature of the "muon puzzle", investigations of the muon bundle energy deposit in the detector material were carried out. For the first time, experimental estimates of the average energy of muons in the bundles of inclined air showers initiated by primary particles with energies from 10 to 1000 PeV have been obtained.

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Section: Local Muon Density Spectramentioning

confidence: 99%