2023 Fiscal Year Final Research Report
Investigation of deep inside of nuclei and neutron stars with high energy photons
| Project Area | Toward new frontiers : Encounter and synergy of state-of-the-art astronomical detectors and exotic quantum beams |
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| Project/Area Number |
18H05459
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | The University of Tokyo (2021-2023)
Tohoku University (2018-2020) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
藤井 優 東北医科薬科大学, 教養教育センター, 教授 (30302079)
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| Project Period (FY) |
2018-06-29 – 2023-03-31
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| Keywords | ハイパー核 / 電子ビーム / ストレンジネス / 電磁生成 / アンジュレータ |
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| Outline of Final Research Achievements |
The nnLambda search experiment was conducted at the Jefferson Lab in the United States, and we successfully obtained the world's first upper limit on the production cross section of the nnLambda system. Additionally, we achieved the first measurements of the electromagnetic production cross sections of Lambda, Sigma0 hyperons, and eta' mesons in low Q2 region. Furthermore, we completed and exported to JLab a pair of charge separation magnets required for the world's first precision isospin-dependence measurements of medium-heavy hypernuclei. At MAMI (Mainz, Germany), we developed the technology to determine the mass of the hypernuclear ground state with an accuracy of several tens of keV through precise measurements of the decay pi- mesons from hypernuclei. We successfully performed an experiment with the decay pi method for the mass measurement of hypertriton (H3L). Additionally, we succeeded in developing technology for the precise measurement of electron beam energy with undulators.
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| Free Research Field |
原子核物理
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| Academic Significance and Societal Importance of the Research Achievements |
米国JLabにおいて原子番号ゼロのハイパー核(nnΛ）の探索実験を遂行し、世界で初めて生成断面積の上限値を得ることに成功した。また、Λ, Σ0、η'電磁生成反応に関する貴重なデータを収集した。さらに、次世代ハイパー核実験で必要となる電荷分離電磁石(PCS)の製作およびJLabへの輸出に成功し、中重ラムダハイパー核精密分光が可能となった。さらに、ドイツMAMIにおいては最も単純なハイパー核である三重水素ラムダハイパー核の質量測定実験、電子ビームエネルギー精密測定技術の開発に成功した。これらにより重い中性子星の謎（ハイペロンパズル）解決への道筋をつけ、ストレンジネス核物理学の進展に大きく貢献した。
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