变形核中的晕现象与形状退耦合  

Deformed halo nuclei and shape decoupling effects

作　　者：孙向向 周善贵 SUN Xiangxiang;ZHOU Shangui(School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China;CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Synergetic Innovation Center for Quantum Effects and Application,Hunan Normal University,Changsha 410081,China;Peng Huanwu Collaborative Center for Research and Education,Beihang University,Beijing 100191,China)

机构地区：[1]中国科学院大学核科学与技术学院,北京100049 [2]中国科学院理论物理研究所中国科学院理论物理前沿重点实验室,北京100190 [3]中国科学院大学物理学院,北京100049 [4]湖南师范大学量子效应及其应用协同创新中心,长沙410081 [5]中国科学院理论物理研究所北京航空航天大学彭桓武科教合作中心,北京100191

出　　处：《核技术》2023年第8期139-147,共9页Nuclear Techniques

基　　金：国家重点研发项目(No.2018YFA0404402);国家自然科学基金(No.11525524,No.12070131001,No.12047503,No.11961141004,No.12205308);中国博士后科学基金(No.2022M713106);中国科学院前沿科学重点研究项目(No.QYZDB-SSWSYS013);中国科学院B类先导科技专项(No.XDB34010000)和培育项目(No.XDPB15)资助。

摘　　要：随着放射性核束物理的快速发展,在远离β稳定线的原子核中发现或者预言了很多奇特核结构现象,包括变形晕、变形晕核中形状退耦合等。对这些奇特核现象的研究是当前核物理的重要前沿领域。协变密度泛函理论是目前最为成功的用于描述原子核结构性质的理论模型之一。本文介绍基于协变密度泛函理论对变形晕核研究的结果和进展。考虑连续谱效应的形变相对论Hartree-Bogoliubov理论实现了变形晕核的微观自洽描述并预言了镁-44中的变形晕和核芯与晕的形状退耦合现象。之后,该理论还被用于研究硼和碳等同位素链原子核中的变形晕现象。基于该理论的角动量投影计算表明:在变形晕核的低激发转动态中依然存在晕现象以及形状退耦合现象。With the rapid development of radioactive-ion-beam facilities worldwide,many exotic nuclear phenomena have been observed or predicted in nuclei far from theβ-stability line or close to the neutron(proton)drip lines,such as halos in atomic nuclei and shape decoupling in deformed halo nuclei.The study of exotic nuclear phenomena,including halos,is at the frontier of current nuclear physics research.The covariant density functional theory(CDFT)is one of the most successful models in nuclear physics.The CDFT has been widely used to study structures and properties of exotic nuclei.The deformed relativistic Hartree-Bogoliubov theory in continuum(DRHBc)has been developed and achieved a self-consistent description of deformed halo nuclei by including deformation and continuum effects,with the deformed relativistic Hartree-Bogoliubov equations solved in the Dirac Woods-Saxon basis.The DRHBc theory has been used to predict the deformed halo structure in 44Mg and the shape decoupling between the core and halo.The theory has also been used to address unresolved problems concerning the radius and configuration of valence neutrons in 22C,deformed halos in carbon and boron isotopes,particles in the classically forbidden regions in magnesium isotopes,and other similar phenomena.The rotational excitation of deformed halos has been investigated by implementing an angular momentum projection based on the DRHBc theory.This investigation has shown that the effects of deformed halos and shape decoupling are also present in the low-lying rotational excitation states of deformed halo nuclei.

关 键 词：协变密度泛函理论 变形晕核 形状退耦合 转动激发 

分 类 号：O571.21[理学—粒子物理与原子核物理]