Production and decay spectra of the neutron-rich hypernuclei and effects of channels coupling
| Project/Area Number |
16K05363
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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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 | Osaka Electro-Communication University |
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Principal Investigator |
HARADA Toru 大阪電気通信大学, 共通教育機構, 教授 (70238187)
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| Co-Investigator(Kenkyū-buntansha) |
平林 義治 北海道大学, 情報基盤センター, 准教授 (60271714)
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| Research Collaborator |
UMEYA Atsushi
KOIKE Takahisa
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | ハイパー核 / ストレンジネス / チャネル結合 / 中性子過剰核 / 核反応 / 連続状態 / 少数多体系 / 核構造 / スペクトル / 理論核物理 / ポテンシャル / コヒーレント |
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| Outline of Final Research Achievements |
We study theoretically production and decay spectra of hypernuclei obtained at J-PARC facilities within a distorted-wave impulse approximation in order to see the effects and role of channel coupling between hypernucler states. The results are as follows: (1) A calculated spectra for a neutron-rich 6H_Lambda hypernucleus via the (pi-, K+) reaction on a 6Li target suggests that the Sigma-mixing probability amounts to about 0.3% via Sigma doorways in comparison with the experimental data. (2) A theoretical analysis shows that the Sigma-5He potential has a repulsive +30 MeV-strength in the real part. (3) Theoretical calculations of the 3He (pi, K) reaction including three-body break-up channels predict that the production cross section of the 3H_Lambda 1/2+ ground state is about 3 μb /sr.
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| Academic Significance and Societal Importance of the Research Achievements |
ハイパー核研究の進展によって，宇宙の物質を構成している陽子や中性子の仲間であるバリオンや湯川粒子のパイ中間子などが担う核力全体の性質が解明され，宇宙にある中性子星やブラックホールの内部構造の理解につながると期待される。本研究でハイペロンと陽子・中性子間にはたらく２体核力やLambda NNなどの３体核力の性質についての理解が進み，核物質中でのハイペロンさらにはストレンジネスの役割とその重要性が分かってきたが，さらなる定量的な研究の進展が望まれる。
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Report
(4 results)
Research Products
(28 results)
