BESS-polar: Search for antihelium

M. Sasaki, K. Abe, H. Fuke, S. Haino, T. Hams, M. Hasegawa, A. Horikoshi, A. Itazaki, K. C. Kim, T. Kumazawa, A. Kusumoto, M. H. Lee, Y. Makida, S. Matsuda, Y. Matsukawa, K. Matsumoto, J. W. Mitchell, Z. Myers, J. Nishimura, M. NozakiR. Orito, J. F. Ormes, K. Sakai, E. S. Seo, Y. Shikaze, R. Shinoda, R. E. Streitmatter, J. Suzuki, Y. Takasugi, K. Takeuchi, K. Tanaka, N. Thakur, T. Yamagami, A. Yamamoto, T. Yoshida, Koji Yoshimura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We have searched for antihelium in cosmic-rays since 1993 using a series of nine conventional BESS northern latitude balloon flights and two long-duration BESS-Polar Antarctic balloon flights. The BESS-Polar spectrometer is an evolutionary development of the previous BESS instruments, adapted to long duration flight. No antihelium candidate was found in the rigidity ranges of 0.6-20 GV among 8 × 106 helium nuclei events for BESS-Polar I and in the rigidity range of 0.6-14 GV among 4 × 107 events for BESS-Polar II, respectively. A resultant upper limit of 6.9 × 10 -8 for the abundance ratio of antihelium/helium at the top of the atmosphere in the rigidity range of 1-14 GV was set by combining all the BESS and BESS-Polar flight data. This is the most stringent limit obtained to date.

Original languageEnglish
Title of host publicationProceedings of the 32nd International Cosmic Ray Conference, ICRC 2011
PublisherInstitute of High Energy Physics
Pages123-126
Number of pages4
Volume5
DOIs
Publication statusPublished - 2011
Externally publishedYes
Event32nd International Cosmic Ray Conference, ICRC 2011 - Beijing, China
Duration: Aug 11 2011Aug 18 2011

Other

Other32nd International Cosmic Ray Conference, ICRC 2011
CountryChina
CityBeijing
Period8/11/118/18/11

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Keywords

  • Antihelium
  • Antimatter
  • BESS
  • BESS-Polar
  • Cosmic-rays

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Sasaki, M., Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Itazaki, A., Kim, K. C., Kumazawa, T., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Matsumoto, K., Mitchell, J. W., Myers, Z., Nishimura, J., ... Yoshimura, K. (2011). BESS-polar: Search for antihelium. In Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011 (Vol. 5, pp. 123-126). Institute of High Energy Physics. https://doi.org/10.7529/ICRC2011/V05/1230