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The DELPHI detector at LEP has been used to measure multi-muon bundlesoriginating from cosmic ray interactions with air. The cosmic events wererecorded in ``parasitic mode'' between individual e+e- interactions and thetotal live time of this data taking is equivalent to 1.6x10^6 seconds. TheDELPHI apparatus is located about 100 metres underground and the 84 metres rockoverburden imposes a cut-off of about 52 GeV/c on muon momenta. The data fromthe large volume Hadron Calorimeter allowed the muon multiplicity of 54201events to be reconstructed. The resulting muon multiplicity distribution iscompared with the prediction of the Monte Carlo simulation based onCORSIKA/QGSJET01. The model fails to describe the abundance of highmultiplicity events. The impact of QGSJET internal parameters on the results isalso studied.

Study of multi-muon bundles in cosmic ray showers detected with the DELPHI detector at LEP