Detection of muon bundles from cosmic ray showers at medium depth underground Original Research Article

The DELPHI detector at Large Electron-Position collider (LEP) at CERN near Geneva, has been used to detect multi-muon bundles originated from cosmic ray interactions in the atmospheres. The muon multiplicity distribution has been measured over a wide range of multiplicities. The cosmic events registered during the years 1999 and 2000 correspond roughly to 1.6 106s of effective run time. This paper provides a preliminary comparison between the data and a prediction of the QGSJET model implemented to the CORSIKA simulation package.