Cosmic-ray muon spectrum derived from the transferred energy spectrum of bursts observed by the Mutron calorimeter

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Abstract
Measurements of the energy transfer, E', of bursts produced in a calorimeter are calibrated by the two magnet spectrometers of Mutron. Using this calibrated calorimeter, the authors observed the energy spectrum of bursts produced in the calorimeter up to 10 TeV and derived the muon energy spectrum at sea level. The exponent of the differential pion production spectrum is 2.62+or-0.10 and 2.75+or-0.17 in the muon energy region from 200 GeV to 6 TeV and from 1 TeV to 6 TeV, respectively. The muon energy spectrum thus obtained is compared with the direct measurement of the muon spectrum by the Mutron magnet spectrometers.