Precision measurement of nuclear reactions with polarized neutrons for time-reversal violation search
| Project/Area Number |
17H02889
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Nagoya University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
吉岡 瑞樹 九州大学, 先端素粒子物理研究センター, 准教授 (20401317)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2017: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
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| Keywords | 中性子 / 時間反転対称性の破れ / CP対称性の破れ / 偏極中性子 / 原子核反応 / J-PARC / 偏極 / 時間反転対称性 / CP対称性 / 複合核 / 原子核（実験） / 対称性の破れ / 素粒子物理実験 / 原子核物理実験 / 原子核(実験) |
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| Outline of Final Research Achievements |
A high performance neutron polarizer with 3He was developed and installed into the beamline BL04 ANNRI in J-PARC. The angular distribution of gamma rays from neutron capture reaction of 139La was clearly observed with the polarized epithermal neutrons. The distributions with polarized and unpolarized neutrons were analyzed with the theory for nuclear reactions. The results tells us that the large enhancement of time-reversal violation in nuclear reaction can be used for search for new physics beyond the standard model with the sensitivity as high as neutron electric dipole moment search.
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| Academic Significance and Societal Importance of the Research Achievements |
宇宙の物質の起源を説明するための物質と反物質の性質の違いがCP対称性の破れであるが、現在の素粒子標準理論では十分に説明できていない。ある種の原子核反応では、基本的な素粒子反応における対称性の破れが増幅して観測される場合がある。本研究では偏極中性子ビームを用いて原子核反応を詳細に調べた。139La原子核の反応ではこの増幅が十分大きく、標準理論を超える物理法則の探索に利用できることがわかった。今回のデータは原子核反応を用いた時間反転対称性の破れの探索実験の基礎データとなる。
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Report
(4 results)
Research Products
(26 results)
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[Journal Article] Fundamental Physics Using High-Performance Optics2018
Author(s)
Kitaguchi Masaaki,Asahi Koichiro,Endo Shunsuke,Haddock Christopher C.,Hino Masahiro,Hirota Katsuya,Ino Takashi,Ito Ikuya,Iwata Takahiro,Koga Jun,Miyachi Yoshiyuki,Momose Takamasa,Oi Noriko,Okudaira Takuya,Sakai Kenji,Shima Tatsushi,Shimizu Hirohiko M.,Takada Shusuke,Yamagata Yutaka,Yamamoto Tomoki,Yoshioka Tamaki
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Journal Title
Proceedings of the International Conference on Neutron Optics (NOP2017)
Volume: 22
Pages: 011034-011034
DOI
Related Report
Peer Reviewed / Open Access
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