27-29 June 2023
National Research Nuclear University MEPhI
Europe/Moscow timezone

Studying muon bundles of inclined air showers in the NEVOD-DECOR experiment

29 Jun 2023, 10:15
B-100 (National Research Nuclear University MEPhI)


National Research Nuclear University MEPhI

Kashirskoe shosse 31, Moscow, Russian Federation, 115409
Original Talk Cosmic rays of very high energies (> 1 PeV) Cosmic rays of very high energies (> 1 PeV)


Aleksei Bogdanov (MEPhI)


NEVOD-DECOR is the unique experiment where systematic studies of cosmic ray muon bundles in a wide range of zenith angles and, accordingly, the energies of primary cosmic rays are carried out. Impressive experimental material (more than 100 thousand events) has been accumulated over a long time period from May 2012 to December 2022. The earlier developed method of local muon density spectra allows us to compare experimental data on muon bundles with the results of the EAS muon component simulations. 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. It is consistent with data of several other experiments on investigations of air shower muon content, but contradicts the available measurements of the depth of the shower maximum in the atmosphere by means of fluorescent technique, which favor a light mass composition at these energies. This probably leads to the need to revise the existing models of hadronic interactions.

Primary author


Natalia Barbashina (MEPhI) Semyon Khokhlov (National Research Nuclear University MEPhI) Victor Kindin (National Research Nuclear University MEPhI) Rostislav Kokoulin (MEPhI) Konstantin Kompaniets (MEPhI) Alena Konovalova (National Research Nuclear University MEPhI) Dr Giampaolo Mannocchi (INAF) Anatoly Petrukhin (MEPhI) Dr Gian Carlo Trinchero (INAF) Victor Shutenko (National Research Nuclear University MEPhI) Vladislav Vorobev (National Research Nuclear University MEPhI) Igor Yashin (National Research Nuclear University MEPhI) Ekaterina Yurina Egor Zadeba (MEPhI)

Presentation Materials