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原子核巨单极共振的统一描述与核物质不可压缩系数

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原子核同位旋标量巨单极共振(ISGMR)的研究是约束核物质不可压缩系数K∞的重要途径,对理解核天体物理现象提供了重要的信息.目前ISGMR研究中存在的一个重要问题是Sn和Pb中ISGMR不能够同时描述,即"为什么Sn同位素给出的状态方程这么软",它阻碍了核物质不可压缩系数K∞的精确约束.本文介绍原子核巨共振研究中常用的准粒子无规相位近似(QRPA)理论,和基于QRPA理论的自洽准粒子振动耦合(QPVC)理论,综述了基于QRPA理论和QRPA+QPVC理论对这一问题的研究现状,重点综述了 QPVC效应对实现ISGMR统一描述的重要作用:通过考虑QPVC效应,能够实现对Sn和Pb同位素中ISGMR的统一描述,解决了"为什么Sn同位素给出的状态方程这么软"的问题,约束了核物质不可压缩系数K∞.基于自洽的QPVC理论,还进一步研究了丰中子Sn同位素134,140Sn的电单极激发强度分布.
Unified Description of Nuclear Giant Monopole Resonances and Nuclear Matter Incompressibility
The study of nuclear isoscalar giant monopole resonance(ISGMR)is an important way to constrain nuclear incom-pressibility coefficient K∞,which provides important information for the understanding of nuclear astrophysics phenomena.At present,there is a serious discrepancy in the unified descriptions of the ISGMR in Pb and Sn isotopes,i.e.,the so called"why is the equation of state for tin so soft?",which prevents us from the accurate determination of K∞.In this paper,we in-troduce the quasiparticle random phase approximation(QRPA)theory,which is commonly used in the study of nuclear giant resonances,and also the self-consistent quasiparticle-vibration coupling(QPVC)theory based on the QRPA.The researches for the current issue within QRPA and QRPA+QPVC theories are reviewed,especially for the important role of the QPVC ef-fects in achieving a unified description of ISGMR:a unified descriptions of ISGMR in Sn and Pb can be achieved with the QPVC effects,the problem"why is the equation of state for tin so soft?"can be solved,and the incompressibility coefficient K∞ is constrained.Besides,based on the self-consistent QPVC theory,we further studied the electric monopole excitation strength disctributions in the neutron-rich Sn isotopes134,140Sn.

nuclear isoscalar giant monopole resonancenuclear equation of statequasiparitcle random phase approxima-tionquasiparticle-vibration coupling effects

牛一斐、李征征

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兰州大学核科学与技术学院,兰州 730000

兰州大学稀有同位素前沿科学中心,兰州 730000

原子核同位旋标量巨单极共振 核物质状态方程 准粒子无规相位近似 准粒子振动耦合效应

国家重点研发计划青年科学家项目国家自然科学基金资助项目

2021YFA160150012075104

2024

原子核物理评论
中国科学院近代物理研究所,中国核物理学会

原子核物理评论

CSTPCD北大核心
影响因子:0.181
ISSN:1007-4627
年,卷(期):2024.41(1)