Center for Underground Physics

ALICE experiment at CERN Large Hadron Collider, located 52 meters underground, carried out a

cosmic data-taking campaign in the period 2015-2018 corresponding to 62.5 days of live time. In this

seminar the analysis of multimuons events, defined as events with more than four detected muons, is

described. In particular the muon multiplicity distribution is studied in the low-intermediate

multiplicity (4<Nμ<50), corresponding on average to primary energy from 4 PeV up to 60 PeV. For

the higher multiplicities, dominated by large fluctuations, the rate of the high muon multiplicity events

(Nμ>100) is measured. The results are compared with the Monte Carlo simulations using three of the

main hadronic interaction models describing the air shower development in the atmosphere: QGSJET-

II-04, EPOS-LHC, and SIBYLL 2.3d.

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