Search for antihelium: Progress with BESS

M. Sasaki, S. Haino, K. Abe, H. Fuke, T. Hams, K. C. Kim, M. H. Lee, Y. Makida, S. Matsuda, J. W. Mitchell, A. A. Moiseev, J. Nishimura, M. Nozaki, S. Orito, J. F. Ormes, T. Sanuki, E. S. Seo, Y. Shikaze, R. E. Streitmatter, J. SuzukiK. Tanaka, T. Yamagami, A. Yamamoto, T. Yoshida, K. Yoshimura

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


In this paper, we report searches for antihelium in cosmic rays using two recently flown magnetic rigidity spectrometers. BESS-TeV had extended rigidity with an MDR of 1.4 TV and had a flight duration of one day. BESS-Polar was optimized for collecting power. It was flown for 8.5 days and had an MDR of 240 GV. The former flight allows us to explore a previously unexplored rigidity band and the latter flight yields a factor of three improvement in the overall BESS limit. No antihelium candidate was found in the rigidity ranges of 1-500 GV, and 0.6-20 GV, among 7 × 10 4 events taken with BESS-TeV, and 8 × 10 6 events taken with BESS-Polar, respectively.

Original languageEnglish
Pages (from-to)450-454
Number of pages5
JournalAdvances in Space Research
Issue number3
Publication statusPublished - Aug 5 2008
Externally publishedYes


  • Antihelium
  • Antimatter
  • BESS
  • BESS-Polar
  • BESS-TeV
  • Cosmic ray

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)


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