Abstract

The energy spectrum of cosmic-ray muons at sea-level has been measured in the energy range of 1 TeV to 10 TeV with the emulsion chambers exposed at shallow depth underground. The total amount of exposure is 61.6 tons of lead/year. On the vertical muon intensity, it is shown that the index of the spectrum is 2.70±0.10, when it is expressed with a single power law. The zenith angle distributions in the energies around several TeV are not inconsistent with those expected from the muons of pion and kaon decay.

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