Investigation of muon bundles in horizontal cosmic ray flux

摘要

A new large area coordinate detector DECOR is deployed around water Cherenkov calorimeter NEVOD and is intended for studies of various cosmic ray components at the Earth's surface.On the basis of data accumulated during experimental runs 2002 - 2003,the first results on cosmic ray muon bundles are obtained.Preliminary data on zenith angle dependence of the ratio of muon group intensity and that of single particles in the range 60~° - 90~° are presented and compared with MC simulation of EAS muons with CORSIKA.A special attention is paid to muon groups of large multiplicity near horizon.