| Project/Area Number |
22540322
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Okayama University (2012-2013)
High Energy Accelerator Research Organization (2010-2011) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
HASEGAWA Masaya 高エネルギー加速器研究機構, 素粒子原子核研究所, 助教 (60435617)
YAMAMOTO Akira 高エネルギー加速器研究機構, 超伝導低温工学センター, 教授 (30113418)
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| Research Collaborator |
SAKAI Kenichi NASA Goddard Space Flight Center
SASAKI Makoto NASA Goddard Space Flight Center
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| Project Period (FY) |
2010-04-01 – 2013-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2010: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | ESS-Polar / 南極周回飛翔 / 物質反物質非対称性 / 暗黒物質 / 原始ブラックホール / 初期宇宙 / 長時間気球観測 / 宇宙線 / 反重陽子 / 反ヘリウム / BESS-Polar / 物質・反物質対称性 / 太陽活動 / 物質・反物質非対称 |
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| Research Abstract |
We have searched for cosmic-ray antideuteron and antihelium with BESS-Polar II data. We carefully examined the recovered BESS-PolarII payload from Antarctica and obtained various key information about the detector status during the flight and improved detector performance with the novel calibration method. Based on the data, new searches were performed for antideuteron and antihelium with improved sensitivity by an order of magnitude. No candidates were observed. Null observation of antihelium, together with previous BESS data, placed the most stringent constraint on existence of anti-domain nearby our universe.
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