Measurements of cosmic-ray hydrogen and helium isotopes with BESS-polar I in 2004

K. C. Kim, K. Abe, H. Fuke, S. Haino, T. Hams, A. Itazaki, T. Kumazawa, M. H. Lee, S. E. Lee, Y. Makida, S. Matsuda, K. Matsumoto, J. W. Mitchell, A. A. Moiseev, Z. Myers, J. Nishimura, M. Nozaki, R. Orito, J. F. Ormes, M. SasakiE. S. Seo, Y. Shikaze, R. E. Streitmatter, J. Suzuki, Y. Takasugi, K. Takeuchi, K. Tanaka, T. Yamagami, A. Yamamoto, T. Yoshida, K. Yoshimura

Research output: Contribution to conferencePaperpeer-review


The Balloon-borne Experiment with a Superconducting Spectrometer (BESS-Polar I) was flown successfully 13 - 21 December 2004 for the first time in Antarctica. A total number of 900 million cosmic-ray events were recorded from the 8-day, 13-hour flight. The polar region allowed for a reduction in the detectable rigidity to about 0.26 GV. The energy loss in the scintillators provided charge measurements to separate protons and helium nuclei. Particle trajectories in the magnetic field provided rigidity measurements. Time-of-Flight counters provided particle velocity measurements to identify isotopes. The data selection procedure for hydrogen and helium isotopes and the mass histograms of hydrogen isotope, 2H, measured with the BESS-Polar I flight are presented in this paper.

Original languageEnglish
Publication statusPublished - 2009
Externally publishedYes
Event31st International Cosmic Ray Conference, ICRC 2009 - Lodz, Poland
Duration: Jul 7 2009Jul 15 2009


Other31st International Cosmic Ray Conference, ICRC 2009


  • Balloon flight
  • Cosmic ray
  • Isotope

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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