基于相对论Hartree-Fock-Bogoliubov近似的新幻数研究（英文）  

New Magicity within the Relativistic Hartree-Fock-Bogoliubov Approach

作　　者：李佳杰[1] 龙文辉[1] 

机构地区：[1]兰州大学核科学与技术学院,兰州730000

出　　处：《原子核物理评论》2017年第1期51-56,共6页Nuclear Physics Review

基　　金：National Natural Science Foundation of China(11375076,11675065);Specialized Research Fund for Doctoral Program of Higher Education(20130211110005)~~

摘　　要：基于相对论Hartree-Fock-Bogoliubov(RHFB)近似分别探索了质量-电荷极限下的超重元素与极端中质比下的奇特原子核中的新幻数问题。研究结果表明,赝自旋对称性的守恒和破缺与超重核区球形幻数结构的形成密切相关,并分别决定了中子与质子的新幻数结构。同时,理论模型之间的差异也与之密切相关。在中重奇特核区,RHFB近似很好地再现了Ca同位素中的新幻数N=32,34,其中同位旋矢量道中洛伦兹张量耦合扮演了较为关键的角色。以此为例,研究证明了显式考虑交换(Fock)项的RHFB近似的可靠性。Recent applications of the relativistic Hartree-Fock-Bogoliubov（RHFB） approach in exploring the new magicities under extreme conditions are presented for the superheavy elements with the limits of mass and charge and for the exotic nuclei with extreme neutron-to-proton ratios. It is found that the emergence of new magic shells in superheavy region is tightly related to the restoration and violation of pseudo-spin symmetry, respectively for the neutron and proton ones, in which the model deviations are indicated and discussed. In medium-heavy exotic nuclei, the occurrence of new magicity N = 32, 34 in Ca isotopes is well reproduced by the RHFB approach, in which the isovector Lorentz tensor couplings are found to play an essential role. The results exemplify that the RHFB approach, which considers the exchange（Fock） terms explicitly, furnishes a new theoretical instrument for advancing relativistic nuclear mean-field approaches.

关 键 词：新幻数 奇特核 超重核 赝自旋对称性 张量力 

分 类 号：O571.6[理学—粒子物理与原子核物理]