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

T. Sanuki; M. Motoki; H. Matsumoto; E. S. Seo; J. Z. Wang; K. Abe; K. Anraku; Y. Asaoka; M. Fujikawa; M. Imori; T. Maeno; Y. Makida; N. Matsui; H. Matsunaga; J. Mitchell; T. Mitsui; A. A. Moiseev; Jun Nishimura; M. Nozaki; S. Orito; J. F. Ormes; T. Saeki; M. Sasaki; Y. Shikaze; T. Sonoda; R. E. Streitmatter; J. Suzuki; К. Таnака; I. Ueda; Nobuyuki Yajima; T. Yamagami; A. Yamamoto; T. Yoshida; Kotaro Yoshimura

doi:10.1086/317873

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

T. Sanuki(The University of Tokyo), M. Motoki(Tohoku University), H. Matsumoto(The University of Tokyo), E. S. Seo(University of Maryland, College Park), J. Z. Wang(University of Maryland, College Park), K. Abe(The University of Tokyo), K. Anraku(The University of Tokyo), Y. Asaoka(The University of Tokyo), M. Fujikawa(The University of Tokyo), M. Imori(The University of Tokyo), T. Maeno(Kobe University), Y. Makida(High Energy Accelerator Research Organization), N. Matsui(The University of Tokyo), H. Matsunaga(University of Tsukuba), J. Mitchell(Goddard Space Flight Center), T. Mitsui(Tohoku University), A. A. Moiseev(Goddard Space Flight Center), Jun Nishimura(The University of Tokyo), M. Nozaki(Kobe University), S. Orito(The University of Tokyo), J. F. Ormes(Goddard Space Flight Center), T. Saeki(The University of Tokyo), M. Sasaki(High Energy Accelerator Research Organization), Y. Shikaze(The University of Tokyo), T. Sonoda(The University of Tokyo), R. E. Streitmatter(Goddard Space Flight Center), J. Suzuki(High Energy Accelerator Research Organization), К. Таnака(High Energy Accelerator Research Organization), I. Ueda(The University of Tokyo), Nobuyuki Yajima(Institute of Space and Astronautical Science), T. Yamagami(Institute of Space and Astronautical Science), A. Yamamoto(High Energy Accelerator Research Organization), T. Yoshida(High Energy Accelerator Research Organization), Kotaro Yoshimura(The University of Tokyo)

The Astrophysical Journal

December 20, 2000

10.1086/317873

Cited by 316Open Access

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Abstract

We report cosmic-ray proton and helium spectra in energy ranges of 1 to 120GeV and 1 to 54 GeV/nucleon, respectively, measured by a balloon flight of theBESS spectrometer in 1998. The magnetic-rigidity of the cosmic-rays wasreliably determined by highly precise measurement of the circular track in auniform solenoidal magnetic field of 1 Tesla. Those spectra were determinedwithin overall uncertainties of +-5 0.000000or protons and +- 10 0.000000or helium nucleiincluding statistical and systematic errors.

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