Measurement of Cosmic-Ray Proton, Antiproton and Muon Spectra at Mountain Altitude

Sanuki, T.; Fujikawa, M.; Abe, K.; Anraku, K.; Fuke, H.; Haino, S.; Imori, M.; Izumi, K.; Maeno, T.; Makida, Y.; Matsui, N.; Matsumoto, H.; Matsunaga, H.; Nishimura, J.; Nozaki, M.; Orito, S.; Sasaki, M.; Shikaze, Y.; Suzuki, J.; Tanaka, K.; Yamamoto, A.; Yamamoto, Y.; Yamato, K.; Yoshida, T.; Yoshimura, K.

Measurement of Cosmic-Ray Proton, Antiproton and Muon Spectra at Mountain Altitude

Authors

Description

Measurement of cosmic-ray proton, antiproton and muon spectra was carried out at mountain altitude. We observed 2 x 10^5 protons and 10^2 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.
To be published in the proceedings of ICRC2003