Results from BESS-polar i 2004 Antarctica flight

T. Hams, K. Abe, H. Fuke, S. Haino, M. Hasegawa, A. Horikoshi, K. C. Kim, M. H. Lee, Y. Makida, S. Matsuda, J. W. Mitchell, A. A. Moiseev, J. Nishimura, M. Nozaki, R. Orito, J. F. Ormes, K. Sakai, M. Sasaki, E. S. Seo, R. E. StreitmatterJ. Suzuki, K. Tanaka, N. Thakur, T. Yamagami, A. Yamamoto, T. Yoshida, K. Yoshimura

Research output: Contribution to conferencePaperpeer-review


The Search for antimatter in the galactic cosmic radiation is one of the main scientific objectives of the Balloon-borne Experiment with a Superconducting Spectrometer (BESS). A flatter antiproton spectrum below the secondary production peak at 2 GeV might suggest possible novel antiproton sources, such as evaporating black-holes or decaying super symmetric particles. The BESS-Polar experiment is designed as a highly transparent magnetic rigidity spectrometer that can precisely detect antiprotons down to energies of 0.1 GeV were a potential excess of primary antiprotons over the secondary production might be more apparent. The BESS-Polar instrument had its first successful balloon flight in December 2004, from McMurdo Station in Antarctica. During the 8.5-day long flight 900 million events were recorded. In this paper, we report antiproton and proton spectra as well as the search for antihelium.

Original languageEnglish
Number of pages4
Publication statusPublished - 2007
Externally publishedYes
Event30th International Cosmic Ray Conference, ICRC 2007 - Merida, Yucatan, Mexico
Duration: Jul 3 2007Jul 11 2007


Other30th International Cosmic Ray Conference, ICRC 2007
CityMerida, Yucatan

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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