2018 Fiscal Year Final Research Report
Theoretical study of double spin-isospin excitation
| Project/Area Number |
16K05367
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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 | Institute of Physical and Chemical Research |
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Principal Investigator |
SAGAWA HIROYUKI 国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 客員主管研究員 (50178589)
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| Research Collaborator |
Colo Gianluca
Bai Chun Lin
Cao LiGang
Roca-Moza Xavi
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | ガモフテラー状態 / β崩壊 / アイソスピン同位体 / 荷電非保存力 |
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| Outline of Final Research Achievements |
In this project, I studied spin-isospin excitations such as double isobaric analogue state, double Gamow-Teller state and spin-dipole excitations induced by heavy ion charge exchange reactions. As theoretical models, I adopt Hartree-Fock- Bogolyubov theory and quasi-particle random phase approximation and applied to collective excitations revealed by double charge exchange reactions. I studied further the single and double charge exchange excitations by the sum rule method in order to establish a quantitative transition strength of double beta decay matrix elements. I discussed also in a unified way between double Gamow-Teller and double isobaric analogue states and examine the effect of charge symmetry breaking and charge independent breaking forces.
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| Free Research Field |
原子核理論
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| Academic Significance and Societal Importance of the Research Achievements |
スピン、アイソスピンは量子多体系としての原子核構造を紐解く最も重要な概念である。その最先端の研究課題の２重ガモフ テラー励起状態及び２重スピン双極子励起状態は新しい集団励起状態として注目されているとともに、ニュートリノの質量を決める零ニュートリノ型２重β崩壊と相補的な関係にあり、非常に弱い遷移確率の２重β崩壊と非常に大きな確率遷移を持つ巨大スピン アイソスピン励起を同じ理論模型で定量的に解析することにより、原子核物理だけでなく素粒子物理や宇宙物理にも大きなインパクトを持つ研究である。
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