Search for antihelium with the BESS-polar spectrometer

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. Nozaki, R. OritoJ. F. Ormes, K. Sakai, M. Sasaki, 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: Contribution to journalArticle

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Abstract

In two long-duration balloon flights over Antarctica, the Balloon-borne Experiment with a Superconducting Spectrometer (BESS) collaboration has searched for antihelium in the cosmic radiation with the highest sensitivity reported. BESS-Polar I flew in 2004, observing for 8.5 days. BESS-Polar II flew in 2007-2008, observing for 24.5 days. No antihelium candidate was found in BESS-Polar I data among 8.4×106 |Z|=2 nuclei from 1.0 to 20 GV or in BESS-Polar II data among 4.0×107 |Z|=2 nuclei from 1.0 to 14 GV. Assuming antihelium to have the same spectral shape as helium, a 95% confidence upper limit to the possible abundance of antihelium relative to helium of 6.9×10 -8 was determined combining all BESS data, including the two BESS-Polar flights. With no assumed antihelium spectrum and a weighted average of the lowest antihelium efficiencies for each flight, an upper limit of 1.0×10 -7 from 1.6 to 14 GV was determined for the combined BESS-Polar data. Under both antihelium spectral assumptions, these are the lowest limits obtained to date.

Original languageEnglish
Article number131301
JournalPhysical Review Letters
Volume108
Issue number13
DOIs
Publication statusPublished - Mar 29 2012
Externally publishedYes

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spectrometers
helium
flight
balloon flight
nuclei
Antarctic regions
balloons
confidence
cosmic rays
sensitivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., ... Yoshimura, K. (2012). Search for antihelium with the BESS-polar spectrometer. Physical Review Letters, 108(13), [131301]. https://doi.org/10.1103/PhysRevLett.108.131301

Search for antihelium with the BESS-polar spectrometer. / 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.; Nozaki, M.; Orito, R.; Ormes, J. F.; Sakai, K.; Sasaki, M.; Seo, E. S.; Shikaze, Y.; Shinoda, R.; Streitmatter, R. E.; Suzuki, J.; Takasugi, Y.; Takeuchi, K.; Tanaka, K.; Thakur, N.; Yamagami, T.; Yamamoto, A.; Yoshida, T.; Yoshimura, Koji.

In: Physical Review Letters, Vol. 108, No. 13, 131301, 29.03.2012.

Research output: Contribution to journalArticle

Abe, K, Fuke, H, Haino, S, Hams, T, Hasegawa, M, Horikoshi, A, Itazaki, A, Kim, KC, Kumazawa, T, Kusumoto, A, Lee, MH, Makida, Y, Matsuda, S, Matsukawa, Y, Matsumoto, K, Mitchell, JW, Myers, Z, Nishimura, J, Nozaki, M, Orito, R, Ormes, JF, Sakai, K, Sasaki, M, Seo, ES, Shikaze, Y, Shinoda, R, Streitmatter, RE, Suzuki, J, Takasugi, Y, Takeuchi, K, Tanaka, K, Thakur, N, Yamagami, T, Yamamoto, A, Yoshida, T & Yoshimura, K 2012, 'Search for antihelium with the BESS-polar spectrometer', Physical Review Letters, vol. 108, no. 13, 131301. https://doi.org/10.1103/PhysRevLett.108.131301
Abe K, Fuke H, Haino S, Hams T, Hasegawa M, Horikoshi A et al. Search for antihelium with the BESS-polar spectrometer. Physical Review Letters. 2012 Mar 29;108(13). 131301. https://doi.org/10.1103/PhysRevLett.108.131301
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. ; Nozaki, M. ; Orito, R. ; Ormes, J. F. ; Sakai, K. ; Sasaki, M. ; Seo, E. S. ; Shikaze, Y. ; Shinoda, R. ; Streitmatter, R. E. ; Suzuki, J. ; Takasugi, Y. ; Takeuchi, K. ; Tanaka, K. ; Thakur, N. ; Yamagami, T. ; Yamamoto, A. ; Yoshida, T. ; Yoshimura, Koji. / Search for antihelium with the BESS-polar spectrometer. In: Physical Review Letters. 2012 ; Vol. 108, No. 13.
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abstract = "In two long-duration balloon flights over Antarctica, the Balloon-borne Experiment with a Superconducting Spectrometer (BESS) collaboration has searched for antihelium in the cosmic radiation with the highest sensitivity reported. BESS-Polar I flew in 2004, observing for 8.5 days. BESS-Polar II flew in 2007-2008, observing for 24.5 days. No antihelium candidate was found in BESS-Polar I data among 8.4×106 |Z|=2 nuclei from 1.0 to 20 GV or in BESS-Polar II data among 4.0×107 |Z|=2 nuclei from 1.0 to 14 GV. Assuming antihelium to have the same spectral shape as helium, a 95{\%} confidence upper limit to the possible abundance of antihelium relative to helium of 6.9×10 -8 was determined combining all BESS data, including the two BESS-Polar flights. With no assumed antihelium spectrum and a weighted average of the lowest antihelium efficiencies for each flight, an upper limit of 1.0×10 -7 from 1.6 to 14 GV was determined for the combined BESS-Polar data. Under both antihelium spectral assumptions, these are the lowest limits obtained to date.",
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T1 - Search for antihelium with the BESS-polar spectrometer

AU - Abe, K.

AU - Fuke, H.

AU - Haino, S.

AU - Hams, T.

AU - Hasegawa, M.

AU - Horikoshi, A.

AU - Itazaki, A.

AU - Kim, K. C.

AU - Kumazawa, T.

AU - Kusumoto, A.

AU - Lee, M. H.

AU - Makida, Y.

AU - Matsuda, S.

AU - Matsukawa, Y.

AU - Matsumoto, K.

AU - Mitchell, J. W.

AU - Myers, Z.

AU - Nishimura, J.

AU - Nozaki, M.

AU - Orito, R.

AU - Ormes, J. F.

AU - Sakai, K.

AU - Sasaki, M.

AU - Seo, E. S.

AU - Shikaze, Y.

AU - Shinoda, R.

AU - Streitmatter, R. E.

AU - Suzuki, J.

AU - Takasugi, Y.

AU - Takeuchi, K.

AU - Tanaka, K.

AU - Thakur, N.

AU - Yamagami, T.

AU - Yamamoto, A.

AU - Yoshida, T.

AU - Yoshimura, Koji

PY - 2012/3/29

Y1 - 2012/3/29

N2 - In two long-duration balloon flights over Antarctica, the Balloon-borne Experiment with a Superconducting Spectrometer (BESS) collaboration has searched for antihelium in the cosmic radiation with the highest sensitivity reported. BESS-Polar I flew in 2004, observing for 8.5 days. BESS-Polar II flew in 2007-2008, observing for 24.5 days. No antihelium candidate was found in BESS-Polar I data among 8.4×106 |Z|=2 nuclei from 1.0 to 20 GV or in BESS-Polar II data among 4.0×107 |Z|=2 nuclei from 1.0 to 14 GV. Assuming antihelium to have the same spectral shape as helium, a 95% confidence upper limit to the possible abundance of antihelium relative to helium of 6.9×10 -8 was determined combining all BESS data, including the two BESS-Polar flights. With no assumed antihelium spectrum and a weighted average of the lowest antihelium efficiencies for each flight, an upper limit of 1.0×10 -7 from 1.6 to 14 GV was determined for the combined BESS-Polar data. Under both antihelium spectral assumptions, these are the lowest limits obtained to date.

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