核结构模型中的两体以上相互作用（英文）

发布时间：2019-06-25 00:01

【摘要】：讨论了核结构模型中两体以上相互作用的可能形式。首先以基于手征微扰论并适于描述轻核的三体接触型相互作用为例,讨论了能合理描述~3H和~3He结合能的三核子接触型相互作用相关的两个低能有效耦合参数cD和cE间的关系并通过4He结合能给出了相应的物理参数区。其次通过Okubo-Lee-Suzuzki有效相互作用方法对核多体问题在有限模型空间的求解,论证了A-体相互作用项。最后利用包含了A-体推广对力的可解模型对重核的同位素长链进行了分析。以132Sn为核芯,通过对Sn同位素链的计算揭示了推广对力参数G(A)与模型价核子空间维数dim(A)间的显著关系:G(A)=259.436 dim(A)-0.9985。这些分析结果说明,有必要对核中经手征微扰论或其它唯象理论所得到的NNN-,NNNN-,及A-体相互作用作进一步的研究。
[Abstract]:The possible forms of interaction between two bodies and more than two bodies in the nuclear structure model are discussed. Firstly, taking the three-body contact interaction based on chiral perturbation theory and suitable for describing light nucleus as an example, the relationship between two low-energy effective coupling parameters cD and cE, which can reasonably describe the three-nucleon contact interaction between ~ 3 H and ~ 3He binding energy, is discussed, and the corresponding physical parameter regions are given by 4He binding energy. Secondly, the Okubo-Lee-Suzuzki efficient interaction method is used to solve the kernel multibody problem in finite model space, and the A-body interaction term is demonstrated. Finally, the isotopic long chain of heavy nucleus is analyzed by using the solvable model containing A-body extended pair force. Using 132Sn as the core, the significant relationship between the force parameter G (A) and the subspace dimension dim (A) of the valence kernel of the model is revealed by calculating the Sn isotopic chain.: G (A) = 259.436 dim (A)-0.999 5. These results show that it is necessary to further study the interaction between NNN-,NNNN-, and A-body obtained by chiral perturbation theory or other phenomenological theory in nucleus.
【作者单位】：前沿物理研究院;四川大学匹兹堡学院;
【分类号】：O571

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