Search for antihelium: Progress with BESS

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...

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Bibliographic Details
Published in:Advances in space research 2008-08, Vol.42 (3), p.450-454
Main Authors: Sasaki, M., Haino, S., Abe, K., Fuke, H., Hams, T., Kim, K.C., Lee, M.H., Makida, Y., Matsuda, S., Mitchell, J.W., Moiseev, A.A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J.F., Sanuki, T., Seo, E.S., Shikaze, Y., Streitmatter, R.E., Suzuki, J., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K.
Format: Article
Language:English
Subjects:
Antihelium
Antimatter
BESS
BESS-Polar
BESS-TeV
Cosmic ray
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Summary: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.
ISSN:0273-1177
1879-1948
DOI:10.1016/j.asr.2007.09.012