2023 Fiscal Year Final Research Report
Diversity of nuclear matter properties in heavy-ion collisions and Equation of State of asymmetric nuclear matter
| Project/Area Number |
19K14709
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
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| Research Institution | Tottori University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | 重イオン衝突 / 核物質の状態方程式 / 輸送模型 / π中間子生成 / クラスター / 対称エネルギー / ハドロン / 強い相互作用 |
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| Outline of Final Research Achievements |
In order to deduce information on the equation of state (EOS) of isospin-asymmetric nuclear matter at high density, we have performed theoretical simulations of the heavy-ion collisions involving neutron-rich nuclei using a transport model that solves the time evolution of the collision reaction. We have newly developed our transport model by comparing it with the latest experimental data on charged pion production as well as the theoretical results from other transport models. The calculated results clearly show that, in particular, the momentum dependence of the neutron and proton potentials has a significant impact on the charged pion ratio. It is suggested that a comprehensive analysis, including not only the pion production but also nucleons and clusters, is necessary to extract information on EOS from experimental data.
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| Free Research Field |
ハドロン原子核理論
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| Academic Significance and Societal Importance of the Research Achievements |
核物質の状態方程式（EOS）は、物質の基礎方程式であるため重要であり、特に高密度領域での情報は、中性子星の内部構造とも密接に関係している。2017年に連星中性子星合体からの重力波が観測されて以降、原子核物理学だけでなく天体物理学分野からも様々な手法を用いてEOS を制限する試みが急速に行われており、本研究では、地上で高密度核物質を実現できる重イオン衝突に着目した研究である。本研究で得られた知見は、重イオン衝突での核子のダイナミクスの理解やEOSの高精度な情報の抽出を発展させることができる。
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