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. Nozaki; R. 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; K. Yoshimura

doi:10.7529/ICRC2011/V05/1230

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, K. Yoshimura

Research output: Contribution to conference › Paper › peer-review

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 language	English
Pages	123-126
Number of pages	4
DOIs	https://doi.org/10.7529/ICRC2011/V05/1230
Publication status	Published - 2011
Externally published	Yes
Event	32nd International Cosmic Ray Conference, ICRC 2011 - Beijing, China Duration: Aug 11 2011 → Aug 18 2011

Other

Other	32nd International Cosmic Ray Conference, ICRC 2011
Country/Territory	China
City	Beijing
Period	8/11/11 → 8/18/11

Keywords

Antihelium
Antimatter
BESS
BESS-Polar
Cosmic-rays

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.7529/ICRC2011/V05/1230

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. 123-126. Paper presented at 32nd International Cosmic Ray Conference, ICRC 2011, Beijing, China. https://doi.org/10.7529/ICRC2011/V05/1230

Sasaki, M, 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, 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 2011, 'BESS-polar: Search for antihelium', Paper presented at 32nd International Cosmic Ray Conference, ICRC 2011, Beijing, China, 8/11/11 - 8/18/11 pp. 123-126. https://doi.org/10.7529/ICRC2011/V05/1230

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title = "BESS-polar: Search for antihelium",

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.",

keywords = "Antihelium, Antimatter, BESS, BESS-Polar, Cosmic-rays",

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

year = "2011",

doi = "10.7529/ICRC2011/V05/1230",

language = "English",

pages = "123--126",

note = "32nd International Cosmic Ray Conference, ICRC 2011 ; Conference date: 11-08-2011 Through 18-08-2011",

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AU - Sasaki, M.

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 - 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, K.

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

KW - Antihelium

KW - Antimatter

KW - BESS

KW - BESS-Polar

KW - Cosmic-rays

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SP - 123

EP - 126

Y2 - 11 August 2011 through 18 August 2011

ER -

BESS-polar: Search for antihelium

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