The momentum spectrum of sea level cosmic ray muons has been measured for near vertical incidence in the range 5 GeV/c<p<1200 GeV/c by the Durgapur cosmic ray spectrograph. The measured spectrum compares well with that predicted from the pion diffusion model based on the assumption of 100% pions as the parent of muons. The exponent of the pion production spectrum has been determined to be -2.61-0.02+0.03. The present results are compared with the results of other workers.
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Nandi et al. (1972) studied this question.
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