Measurement of cosmic-ray proton and antiproton spectra at mountain altitude
/ Authors
T. Sanuki, M. Fujikawa, H. Matsunaga, K. Abe, K. Anraku, H. Fuke, S. Haino, M. Imori, K. Izumi, T. Maeno
and 15 more authors
Y. Makida, N. Matsui, H. Matsumoto, 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
Abstract Energy spectra of atmospheric secondary cosmic-ray protons and antiprotons were measured at mountain altitude, 2770 m above sea level. We observed more than 10 5 protons and 10 2 antiprotons. Our proton spectrum is generally consistent with other previous measurements. The observed antiproton spectrum suggests that the energy loss due to non-annihilation processes is less significant than that assumed in previous model calculations.
Journal: Physics Letters B