Abstract
The coefficientb N of the photonuclear energy loss for high-energy muons is calculated by the generalized vector-dominance model with the different energy dependences in real photon-nucleon cross-sections and by the parton model with a modified scaling variable. The intensities of cosmic-ray muons at great depths are converted into the energy spectrum by taking range fluctuation into account. By comparing the exponents of the spectrum with those from other experiments, it is concluded that the real photon-nucleon cross-section has a ln2 ν dependence at higher energies than TeV regions.
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