Structure of Li and Be isotopes studied with antisymmetrized molecular dynamics.
Structure of Li and Be isotopes studied with antisymmetrized molecular dynamics.
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使用反对称分子动力学研究 Li 和 Be 同位素的结构。
DOI：
10.1103/physrevc.52.628
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Akira Ono
中科院分区：
文献类型：
--
作者：
Y. Kanada;Hisashi Horiuchi;Akira Ono
用反对称化分子动力学方法系统地研究了Li和Be的奇偶和偶偶同位素的结构，这是一种不需要任何模型假设的理论方法，如团簇的存在。利用摩擦冷却方法构造了具有确定宇称的能量最小本征态。对这些本征态进行角动量投影，得到角动量本征态。结果表明，团簇结构出现在原子核的{italN}{近似x}{italZ}区域，其中{italN}和{talZ}分别代表中子数和质子数。当NitalN增加到8左右时，团簇结构向壳层模型结构转变。此外，在中子区出现了新的团簇特征。能谱和其他量都得到了很好的再现。特别是计算的磁矩很好地描述了观测数据，并解释了观测磁矩与中子数的关系，反映了同位素从团簇结构到壳模型结构的结构变化。结果表明，有效相互作用的密度依赖性是重要的。
Structure of odd-even and even-even isotopes of Li and Be is studied systematically with antisymmetrized molecular dynamics which is a theoretical method free from any model assumptions such as the existence of clustering. The construction of energy-minimum intrinsic states with definite parity is made by the use of the frictional cooling method. Angular momentum projection is applied to these intrinsic states in order to obtain the eigenstates of angular momentum. It is shown that the clustering structure appears in the nuclei in the {ital N}{approx}{ital Z} region with {ital N} and {ital Z} standing for the neutron and proton numbers, respectively. The clustering structure changes toward the shell-model-like structure as {ital N} increases to around {ital N}{approx}8. Furthermore appearance of new-type clustering features is suggested in the neutron-richer region with {ital N}{gt}8. Energy spectra and other quantities are shown to be reproduced well. Especially the calculated magnetic moments describe the observed data quite well, and the neutron number dependence of the observed magnetic moments is explained as the reflection of the structure change of the isotopes from the clustering structure to the shell-model-like structure. It is indicated that the density dependence of the effective interaction is important.