Exploring the halo phenomena of medium-mass nuclei having approximately Z =40 with point-coupled parameters in complex momentum representations

• 作者: Yao-Wu Chu Tai-Hua Heng
• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: NUCLEAR PHYSICS
• 页码范围: 240-246
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1137/abfa84

摘要

To explore the properties of neutron-rich nuclei with approximately 40 protons,the density-dependent point coupling (DD-PC1) effective interaction parameter is adopted in the relativistic mean-field theory with the complex momentum representation (RMF-CMR).The calculated two-neutron separation energy (S2n) and root-mean-square (rms) radii support the halo structure that appear in Mo and Ru isotopic chains.Besides,the neutron skin structures appear in Kr and Sr isotopes.The conclusions drawn are also supported by the single-particle energy levels and their occupancy probability and density distribution.Particularly,the energy levels,which reduce to bound states or are approximately 0 MeV with a small orbital angular momentum,are suggested to provide the primary contribution to increasing the neutron radius.Moreover,the single-particle energy levels significantly re-flect the shell structure.In addition,the neutron drip line nuclei for Kr,Sr,Mo,and Ru elements are proposed via the changes in S2n.