Precise Measurement of Cosmic-Ray Proton and Helium Spectra with the BESS Spectrometer

Authors :: Sanuki, T.
Motoki, M.
Matsumoto, H.
Seo, E. S.
Wang, J. Z.
Abe, K.
Anraku, K.
Asaoka, Y.
Fujikawa, M.
Imori, M.
Maeno, T.
Makida, Y.
Matsui, N.
Matsunaga, H.
Mitchell, J.
Mitsui, T.
Moiseev, A.
Nishimura, J.
Nozaki, M.
Orito, S.
Ormes, J.
Saeki, T.
Sasaki, M.
Shikaze, Y.
Sonoda, T.
Streitmatter, R.
Suzuki, J.
Tanaka, K.
Ueda, I.
Yajima, N.
Yamagami, T.
Yamamoto, A.
Yoshida, T.
Yoshimura, K.
Sanuki, T.
Motoki, M.
Matsumoto, H.
Seo, E. S.
Wang, J. Z.
Abe, K.
Anraku, K.
Asaoka, Y.
Fujikawa, M.
Imori, M.
Maeno, T.
Makida, Y.
Matsui, N.
Matsunaga, H.
Mitchell, J.
Mitsui, T.
Moiseev, A.
Nishimura, J.
Nozaki, M.
Orito, S.
Ormes, J.
Saeki, T.
Sasaki, M.
Shikaze, Y.
Sonoda, T.
Streitmatter, R.
Suzuki, J.
Tanaka, K.
Ueda, I.
Yajima, N.
Yamagami, T.
Yamamoto, A.
Yoshida, T.
Yoshimura, K.
Publication Year :: 2000
Abstract: We report cosmic-ray proton and helium spectra in energy ranges of 1 to 120 GeV and 1 to 54 GeV/nucleon, respectively, measured by a balloon flight of the BESS spectrometer in 1998. The magnetic-rigidity of the cosmic-rays was reliably determined by highly precise measurement of the circular track in a uniform solenoidal magnetic field of 1 Tesla. Those spectra were determined within overall uncertainties of +-5 % for protons and +- 10 % for helium nuclei including statistical and systematic errors.<br />Comment: 12 pages, 4 figures

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