Microscopic multicluster description of the neutron-rich helium isotopes.
Microscopic multicluster description of the neutron-rich helium isotopes.
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富中子氦同位素的微观多簇描述。
DOI：
10.1103/physrevc.50.189
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
Ohbayasi
中科院分区：
文献类型：
--
作者：
Varga;Suzuki;Ohbayasi
在微观三体和五体模型中分别研究了[sup 6]He和[sup 8]He的中子晕结构。包括各种集群安排，以体现集群之间的各种相关性。用随机变分法确定簇间波函数。He和He能量在相同的有效作用力下很好地再现。将半径和密度与实证分析结果进行了比较。计算出的中子和质子半径之差超过0.8 fm，证实了较厚的中子皮。计算了双中子去除谱幅值，并将其用于评价对晕结构敏感的动量分布和[β]衰变谱。结果与实验结果吻合较好。
The neutron halo structure of [sup 6]He and of [sup 8]He is studied in a microscopic three-body and five-body model, respectively. Various cluster arrangements are included to embody a variety of correlations between the clusters. The intercluster wave function is determined with the stochastic variational method. The [sup 6]He and [sup 8]He energies are reproduced with the same effective force very well. The radii and densities are compared with the results of empirical analyses. The calculated difference of the neutron and proton radii exceeds 0.8 fm, confirming the thick neutron skin. The two-neutron removal spectroscopic amplitudes are calculated and used for evaluating the momentum distribution and the [beta] decay spectrum, which are sensitive to the halo structure. A fair agreement with experiment is obtained.