Mechanism of Coulomb breakup of loosely bound nucleus and its application to astrophysical reactions

松散束缚核的库仑破裂机制及其在天体物理反应中的应用

• 批准号: 13640261
• 负责人: OKAMURA Hiroyuki
• 金额: $ 2.24万
• 依托单位: Tohoku University (2003)Saitama University (2001-2002)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640261/
• 关键词: deuteron breakup; Coulomb breakup; neutron capture; astrophysical reaction; nuclear synthesis; three-body reaction mechanism

The Coulomb-breakup of unstable nuclei has recently attracted attention due to their astrophysical interest, but the limited data having large uncertainties hamper the challenge to various theoretical approaches. Expecting the deuteron can be used as an efficient probe for studying those problems, the detailed angular and energy distributions of breakup protons and neutrons in a wide angular range have been measured by constructing a new beam line at RCNP, Osaka University. It is remarkable that the distributions are well scaled among lighter targets but drastically change for ^<208>Pb. This feature is not reproduced by the simple pure-Coulomb breakup theory.

不稳定核的库仑破裂最近因其天体物理学的兴趣而引起了人们的关注，但有限的数据具有很大的不确定性，阻碍了对各种理论方法的挑战。期望氘核能够作为研究这些问题的有效探针，通过在大阪大学RCNP建造一条新的束流线，测量了宽角度范围内碎裂质子和中子的详细角度和能量分布。值得注意的是，较轻目标的分布具有很好的缩放性，但 ^<208>Pb 的分布却发生了巨大的变化。简单的纯库仑破裂理论无法重现该特征。