Multiple interactions of muons in the NUSEX detector and muon energy spectrum deep underground

Abstract

Abstract Multiple electromagnetic interactions of high energy cosmic ray muons in the NUSEX detector (5000 mwe underground) have been analysed. Different modes of the pair meter technique have been used to investigate the muon energy spectrum shape at the observation depth. The observed event distributions are in good agreemetn with the expectation based on the usual picture of underground muon spectra. The first experimental estimates of the muon spectrum parameters at great depths have been obtained. A comparison of the estimated average muon energy with the available theoretical calculations is given.