Spectrum of High-Energy Cosmic-Ray Muons at a Zenith Angle of 75°

Abstract
The energy spectrum of high-energy cosmic-ray muons was measured at an angle of 75° from the vertical. The results show that the direct muon production inferred from underground measurements of muons with energies over 1000 GeV is not observed in these spectrograph measurements at energies up to 300 GeV.

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