2017 Fiscal Year Final Research Report
Strangeness in neutron-rich nuclear matter
| Project Area | Nuclear matter in neutron stars investigated by experiments and astronomical observations |
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| Project/Area Number |
24105003
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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 | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
阪口 篤志 大阪大学, 理学研究科, 准教授 (70205730)
應田 治彦 国立研究開発法人理化学研究所, その他, 研究員 (60221818)
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| Co-Investigator(Renkei-kenkyūsha) |
MIWA Koji 東北大学, 大学院理学研究科, 准教授 (50443982)
KOIKE Takeshi 東北大学, 高度教養教育・学生支援機構, 准教授 (70396422)
AJIMURA Shuhei 大阪大学, 核物理研究センター, 准教授 (10273575)
FUKUDA Tomokazu 大阪電気通信大学, 工学部, 教授 (50116092)
SUZUKI Takatoshi 東京大学, 大学院理学系研究科, 助教 (50415197)
NAKAMURA Satoshi 東北大学, 大学院理学研究科, 教授 (10192642)
UKAI Mifuyu 高エネルギー加速器研究機構, 素粒子原子核研究所, 研究機関講師 (30420053)
YAMAMOTO Takeshi 高エネルギー加速器研究機構, 素粒子原子核研究所, 博士研究員 (80784751)
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| Project Period (FY) |
2012-06-28 – 2017-03-31
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| Keywords | 実験核物理 / ストレンジネス / ハイパー核 / ハイペロン核子相互作用 / K中間子原子核 / 中性子過剰ハイパー核 / ハイパー核ガンマ線分光 / ハイペロン核子散乱 |
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| Outline of Final Research Achievements |
In order to study strangeness mixing in neutron stars, we investigated interactions of Λ, Σ, and K- in neutron-rich nuclear matter at J-PARC.
(1) We searched for a neutron-rich 6ΛH hypernucleus via 6Li(π-,K+). No events were observed and a stringent upper limit of the production cross section was given. The spectrum also suggested a repulsive Σ-nuclear interaction. (2) In γ-spectroscopy experiments we observed a 4ΛHe(1+→0+) γ ray, which confirmed existence of a large charge symmetry breaking in the ΛN interaction. 19ΛF γ rays were also observed and the level scheme was determined, giving information on ΛN interaction in heavy nuclei. (3) We searched for K-pp bound states via 3He(K-,n) reaction and observed a clear evidence for a bound state in a Λp mass spectrum. (4) To clarify Σ- appearance in neutron stars, a Σp scattering experiment has been prepared. We constructed a new detector system for recoil protons and confirmed sufficient performance with proton beams.
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| Free Research Field |
実験核物理
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