2023 Fiscal Year Final Research Report

Novel approach for the Carbon burning processes based on alpha inelastic scattering

Research Project

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Project/Area Number	19K03859
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research Institution	Institute of Physical and Chemical Research (2023) Hokkaido University (2019-2022)
Principal Investigator	KIMURA Masaaki 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, 室長 (50402813)
Project Period (FY)	2019-04-01 – 2024-03-31
Keywords	元素合成 / 核融合 / クラスター
Outline of Final Research Achievements	Using antisymmetrized molecular dynamics, the properties of the cluster resonances relevant to the 12C+12C fusion reaction were investigated. We found that there are many resonances in the energy range of 1-2 MeV in the center-of-mass system, and that their decay widths are rather small. For each resonance, the intensity of the monopole transition was calculated, and the validity of the theoretical calculation was confirmed through comparison with experiments. The reaction rates of fusion reactions were predicted from the properties of the obtained resonance properties. The obtained reaction rate was slightly smaller than the conventional extrapolated value. This result rejects both the Hindrance model (strong suppression of the reaction rate at low temperatures) and the estimate by proxy reactions (large increase in the reaction rate at low temperatures) that have been proposed in recent years.
Free Research Field	原子核物理学
Academic Significance and Societal Importance of the Research Achievements	本研究は、完全微視的な原子核模型によって12C+12C核融合の反応率を求めた初めての研究である。完全微視的な核模型は、数値計算のコストが大きいものの、さまざまな効果を無矛盾に取り入れることができる。そのため、従来の現象論的模型と比べて信頼性が高く、予言能力を持っている。実際に、本研究で予測したクラスター共鳴は、後の実験によって確認されており、高く評価されている。この研究で求めた12C+12C核融合反応の反応率は、超新星爆発のシミュレーションに早速用いられており、原子核物理の発展のみならず、天体現象の理解にも大きく役立つものと期待される。