Measurement of the energy spectrum of underground muons at Gran Sasso with a transition radiation detector
1999
Abstract We have measured directly the residual energy of cosmic ray
muonscrossing the MACRO detector at the Gran Sasso Laboratory. For this measurement we have used a
transition radiation detectorconsisting of three identical modules, each of about 12 m 2 area, operating in the energy region from 100 GeV to 1 TeV. The results presented here were obtained with the first module collecting data for more than two years. The average single
muonenergy is found to be 320 ± 4 (stat.) ± 11 (syst.) GeV in the rock depth range 3000–6500 hg/cm 2 . The results are in agreement with calculations of the energy loss of
muonsin the rock above the detector.
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