Search for Antihelium with the BESS-Polar Spectrometer
In two long-duration balloon flights over Antarctica, the BESS-Polar collaboration has searched for antihelium in the cosmic radiation with higher sensitivity than any reported investigation. BESS- Polar I flew in 2004, observing for 8.5 days. BESS-Polar II flew in 2007-2008, observing for 24.5 days...
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ftdatacite:10.48550/arxiv.1201.2967 2023-05-15T14:05:08+02:00 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, K. 2012 https://dx.doi.org/10.48550/arxiv.1201.2967 https://arxiv.org/abs/1201.2967 unknown arXiv https://dx.doi.org/10.1103/physrevlett.108.131301 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences article-journal Article ScholarlyArticle Text 2012 ftdatacite https://doi.org/10.48550/arxiv.1201.2967 https://doi.org/10.1103/physrevlett.108.131301 2022-04-01T13:54:59Z In two long-duration balloon flights over Antarctica, the BESS-Polar collaboration has searched for antihelium in the cosmic radiation with higher sensitivity than any reported investigation. 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\times 10^6 |Z| = 2 nuclei from 1.0 to 20 GV or in BESS-Polar II data among 4.0\times 10^7 |Z| = 2 nuclei from 1.0 to 14 GV. Assuming antihelium to have the same spectral shape as helium, a 95% confidence upper limit of 6.9 \times 10^-8 was determined by combining all the BESS data, including the two BESS-Polar flights. With no assumed antihelium spectrum and a weighted average of the lowest antihelium efficiencies from 1.6 to 14 GV, an upper limit of 1.0 \times 10^-7 was determined for the combined BESS-Polar data. These are the most stringent limits obtained to date. : 4 pages, 4 figures Text Antarc* Antarctica DataCite Metadata Store (German National Library of Science and Technology) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
spellingShingle |
Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences 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, K. Search for Antihelium with the BESS-Polar Spectrometer |
topic_facet |
Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
description |
In two long-duration balloon flights over Antarctica, the BESS-Polar collaboration has searched for antihelium in the cosmic radiation with higher sensitivity than any reported investigation. 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\times 10^6 |Z| = 2 nuclei from 1.0 to 20 GV or in BESS-Polar II data among 4.0\times 10^7 |Z| = 2 nuclei from 1.0 to 14 GV. Assuming antihelium to have the same spectral shape as helium, a 95% confidence upper limit of 6.9 \times 10^-8 was determined by combining all the BESS data, including the two BESS-Polar flights. With no assumed antihelium spectrum and a weighted average of the lowest antihelium efficiencies from 1.6 to 14 GV, an upper limit of 1.0 \times 10^-7 was determined for the combined BESS-Polar data. These are the most stringent limits obtained to date. : 4 pages, 4 figures |
format |
Text |
author |
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, K. |
author_facet |
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, K. |
author_sort |
Abe, K. |
title |
Search for Antihelium with the BESS-Polar Spectrometer |
title_short |
Search for Antihelium with the BESS-Polar Spectrometer |
title_full |
Search for Antihelium with the BESS-Polar Spectrometer |
title_fullStr |
Search for Antihelium with the BESS-Polar Spectrometer |
title_full_unstemmed |
Search for Antihelium with the BESS-Polar Spectrometer |
title_sort |
search for antihelium with the bess-polar spectrometer |
publisher |
arXiv |
publishDate |
2012 |
url |
https://dx.doi.org/10.48550/arxiv.1201.2967 https://arxiv.org/abs/1201.2967 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://dx.doi.org/10.1103/physrevlett.108.131301 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1201.2967 https://doi.org/10.1103/physrevlett.108.131301 |
_version_ |
1766276799109529600 |