壳模型研究^(10)Be和^(12)Be中的转动带结构  

The descriptions of rotational bands in ^(10)Be and ^(12)Be with shell-model calculations

作　　者：戴博 李健国 许甫荣[1] Bo Dai;Jianguo Li;Furong Xu(School of Physics,Peking University,Beijing 100871,China)

机构地区：[1]北京大学物理学院,北京100871

出　　处：《科学通报》2021年第28期3712-3718,共7页Chinese Science Bulletin

基　　金：国家重点研发计划(2018YFA0404401);国家自然科学基金(11835001,12035001,11921006)资助。

摘　　要：基于WBP和YSOX两种核子-核子相互作用,用壳模型计算研究了^(10)Be和^(12)Be的激发能谱.为了解激发态的结构性质,用轨道角动量分解方法对^(10)Be和^(12)Be的激发态波函数进行了分析,预言了可能存在的转动带结构.研究了中子数N=8壳层下^(10)Be和^(12)Be中的跨壳效应与转动带之间的关系,比较了WBP和YSOX两种相互作用计算结果的异同.此外,还研究了^(10)Be和^(12)Be核的转动特性.研究结果可为今后相关实验提供有用信息.The rotation band is an important issue in the studies of nuclear structures,which offers a good laboratory for understanding of nuclear deformation,shell evolution,and other properties.Studies of nuclear collective rotations have mainly focused on open-shell nuclei in heavy-mass regions.Traditional collective models,such as the total Routhian surface and particle-rotor models,have been widely used.In principle,the phenomenological collective models are not suitable for the descriptions of rotations of light nuclei.The shell model with configuration interactions can describe any mass-region nuclei,as long as one chooses an appropriate model space.There have been recent studies of rotational bands of light nuclei within the shell model framework.The shell model calculation has shown a powerful model for the descriptions of low-lying states and shell evolutions.On the other hand,the shell model is a useful and popular method to analyze configurations of states.Recently,the L-S decomposition has been suggested for analyzing the collective properties of nuclei with shell-model calculation.In these light nuclei around the dripline,the intruded higher single-particle orbitals often occur in the ground states and mix with the normal single-particle orbitals.And a lot of work has been done to learn the exotic properties of the neutronrich nuclei near ^(12)Be.In the case of ^(12)Be and its neighboring nuclei,it is believed that the strong configuration mixing of the intruder states and normal states leads to large deformations.And the rotational bands can build on the band-head states with large deformations.Therefore,an interesting question is whether rotational bands can exist in such light systems,and what the corresponding configurations are in the shell-model framework.In the present paper,using the WBP and YSOX interactions,we perform shell model calculations for the low-lying states of ^(10)Be and ^(12)Be,focusing on their excitation spectra.The rotational bands are constructed using the calculated B(E2)values and

关 键 词：壳模型 转动带 闯入态 L-S分解 

分 类 号：O571[理学—粒子物理与原子核物理]