Measurement of Cosmic-Ray Proton, Antiproton and Muon Spectra at Mountain Altitude
T. Sanuki, M. Fujikawa, K. Abe, K. Anraku, H. Fuke, S. Haino, M. Imori, K. Izumi, T. Maeno, Y. Makida, N. Matsui, H. Matsumoto, H. Matsunaga, J. Nishimura, M. Nozaki, S. Orito, M. Sasaki, Y. Shikaze, J. Suzuki, K. Tanaka, A. Yamamoto, Y. Yamamoto, K. Yamato, T. Yoshida, K. Yoshimura
Abstract
Measurement of cosmic-ray proton, antiproton and muon spectra was carried out at mountain altitude. We observed 2 x 105 protons and 102 antiprotons in a kinetic energy region of 0.25 -- 3.3 GeV. Zenith-angle dependence of proton fluxes was obtained. Atmospheric muon spectra were measured simultaneously. The observed antiproton spectrum showed some deviation from theoretical predictions particularly in a low energy region.
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