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Cosmic-ray muon spectrum up to 20 TeV at 89° zenith angle

S. Matsuno, F. Kajino, Y. Kawashima, T. Kitamura, K. Mitsui, Y. Muraki, Y. Ohashi, A. Okada, and T. Suda

Y. Minorikawa

K. Kobayakawa

Y. Kamiya and I. Nakamura

T. Takahashi

  • Institute for Cosmic Ray Research, University of Tokyo, Tanashi, Tokyo 188, Japan

  • Department of Physics, Kinki University, Higashi Osaka, Osaka 577, Japan

  • College of Liberal Arts, Kobe University, Nada-ku, Kobe 657, Japan

  • Department of Physics, Nagoya University, Chikusa-ku, Nagoya 464, Japan

  • Department of Physics, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan

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Phys. Rev. D 29, 1 – Published 1 January, 1984

DOI: https://doi.org/10.1103/PhysRevD.29.1

Abstract

The 800-ton cosmic-ray spectrograph (MUTRON) has been used to measure the sea-level energy spectrum of cosmic-ray muons arriving from 86° to 90° zenith angles in the momentum region of 100-20 000 GeV/c. The measured muon energy spectrum can be interpreted by using a cosmic-ray primary spectrum of (1.80 cm−2s−1sr−1GeV−1)E−2.70dE (E in GeV) and a scaling model incorporating an increasing interaction cross section for meson production in hadron-hadron interaction. The muon charge ratio at energies up to 15 TeV in the same zenith-angle range has been measured. It shows a small enhancement with increasing energy. By combining both results we may conclude that the cosmic-ray primary particle composition stays the same up to about 100 TeV as that obtained by direct measurements in the energy range below 1 TeV.

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Phys. Rev. D 29, 1– Published 1 January, 1984
  • Received 1 June 1983

© 1984 American Physical Society

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