Properties and structure of N=Z nuclei within relativistic mean field theory
The axially deformed relativistic mean field theory with the force NLSH has been performed in the blocked BCS approximation to investigate the properties and structure of N=Z nuclei from Z=20 to Z=48.Some ground state quantities such as binding energies, quadrupole deformations, one/two-nucleon separation energies, root-mean-square (rms) radii of charge and neutron, and shell gaps have been calculated.The results suggest that large deformations can be found in medium-heavy nuclei with N=Z=38-42.The charge and neutron rms radii increase rapidly beyond the magic number N=Z=28 until Z=42 with increasing nucleon number, which is similar to isotope shift, yet beyond Z=42, they decrease dramatically as the structure changes greatly from Z=42 to Z=43.The evolution of shell gaps with proton number Z can be clearly observed.Besides the appearance of possible new shell closures, some conventional shell closures have been found to disappear in some region.In addition, we found that the Coulomb interaction is not strong enough to breakdown the shell structure of protons in the current region.
作 者： GAO Yuan DONG Jian-Min ZHANG Hong-Fei ZUO Wei LI Jun-Qing 作者单位： GAO Yuan(Hangzhou Dianzi University,Hangzhou 310018,China;School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China)DONG Jian-Min,ZHANG Hong-Fei(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China)
ZUO Wei,LI Jun-Qing(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)
刊 名： 中国物理C(英文版) ISTIC 英文刊名： CHINESE PHYSICS C 年，卷(期)： 2009 33(10) 分类号： O4 关键词： mean field theory BCS approximation binding energy