2017 Fiscal Year Final Research Report
Hyperfine splitting of antihydrogen and Magnetic moment of antiproton
| Project/Area Number |
24000008
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| Research Category |
Grant-in-Aid for Specially Promoted Research
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
Mathematics and Physics
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
YAMAZAKI Yasunori 国立研究開発法人理化学研究所, Ulmer基本的対称性研究室, 研究員 (30114903)
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| Co-Investigator(Kenkyū-buntansha) |
ULMER Stefan 国立研究開発法人理化学研究所, Ulmer基本的対称性研究室, 主任研究員 (50624813)
MATZUDA Yasuyuki 東京大学, 総合文化研究科, 准教授 (70321817)
NAGATA Yugo 東京農工大学, 工学研究科, 特任助教 (30574115)
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| Co-Investigator(Renkei-kenkyūsha) |
KURODA Naofumi 東京大学, 総合文化研究科, 助教 (10391947)
HIGAKI Hiroyuki 広島大学, 先端物質科学研究科, 准教授 (10334046)
NAGASHIMA Yasuyuki 東京理科大学, 理学部, 教授 (60198322)
KANAI Yasuyuki 国立研究開発法人理化学研究所, 仁科加速器センター, 研究員 (00177487)
TORII Hiroyuki 東京大学, 理学部, 准教授 (20302838)
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| Research Collaborator |
WIDMANN Everhard Stefan Meier Institut, 所長
BLAUM Klaus Max Planck Institut, ディレクター
VENTURELLI Luca Brescia Univ., 教授
BREUKER Horst CERN, 研究員
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| Project Period (FY) |
2012 – 2017
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| Keywords | 反物質 / 反水素 / 反陽子 / CPT対称性 / 磁気モーメント / 陽電子 |
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| Outline of Final Research Achievements |
The fundamental properties of antimatter have been experimentally studied employing antihydrogen atoms and antiprotons to search for the mystery why antimatter does not exist in our universe although the same amount of antimatter and matter should have been created at the time of the big bang. We have succeeded to make an antihydrogen beam and to measure its principal quantum number distribution. The mass to charge ratios of antiproton and proton was measured and found to be the same even with the precision of ~10-11. The magnetic moment of antiproton was determined with a precision 2000 times better than the foregoing study. This is an epoch-making achievement in the sense that the property of antiproton which does not exist in our universe is known better than that of proton which is most abundant and omnipresent. Later, we determined the magnetic moment of proton with higher precision than that of antiproton. By combining these world-best achievements, the CPT symmetry with respect to the magnetic moment of proton and antiproton was found to be conserved with 3000 times better precision than before. Antiprotons were continuously trapped for 405 days, which corresponds to the lower limit of antiproton lifetime of 10.2 years.
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| Free Research Field |
物理学
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