Aleksei Bogdanov
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))
In a number of experiments on the study of ultrahigh-energy cosmic rays, an excess of muons in extensive air showers in comparison with calculations performed within modern (post-LHC) models of hadronic interactions is observed. An analysis of the NEVOD-DECOR data over a long period of time indicates an increase in the excess of muon bundles with increasing energy of primary cosmic ray particles, so that at ~ 10^18 eV the intensity is consistent with the expected one only under the assumption of an extremely heavy mass composition. The key to explaining the excess of muons may be the study of the energy characteristics of muon bundles, that are conducted in the NEVOD-DECOR experiment. Recently, estimates of the average muon energy in the bundles were obtained and its increase compared to the results of calculations at energies above 10^17 eV was found. Thus, the solution of the muon puzzle may require major changes to the existing models of hadron interactions.
Aleksei Bogdanov
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))
Natalia Barbashina
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))
Semyon Khokhlov
(National Research Nuclear University MEPhI)
Victor Kindin
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))
Rostislav Kokoulin
(National Research Nuclear University MEPhI)
Konstantin Kompaniets
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))
Ms.
Alena Konovalova
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))
Giampaolo Mannocchi
(Osservatorio Astrofisico di Torino - INAF)
Anatoly Petrukhin
(National Research Nuclear University MEPhI)
Giancarlo Trinchero
(Osservatorio Astrofisico di Torino - INAF)
Victor Shutenko
(National Research Nuclear University (MEPhI))
Vladislav Vorobev
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))
Igor Yashin
(National Research Nuclear University MEPHI)
Ekaterina Yurina
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))
Egor Zadeba
(National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))
