_Λ~ACa和_(ΛΛ)~ACa超核中的巨中子晕现象  

Giant Neutron Halos in Λ-Hypernuclei _Λ ~A a and _(ΛΛ)~ACa in the Relativistic Continuum Hartree-Bogoliubov Theory

作　　者：吕洪凤[1] 孟杰[1] 张双全[1] 

机构地区：[1]北京大学物理学院,北京100871

出　　处：《高能物理与核物理》2003年第5期411-415,共5页High Energy Physics and Nuclear Physics

基　　金：国家重点基础研究发展规划 (G2 0 0 0 0 7740 7) ;国家自然科学基金 ( 10 0 2 5 5 2 2 ;198470 0 2 ;1993 5 0 3 0 )资助~~

摘　　要：利用密度相关零程对力的相对论连续谱Hartree Bogoliubov方法 ,对偶中子数的Ca同位素从质子滴线到中子滴线范围内的单Λ超核和双Λ超核基态性质进行了系统研究 .与通常的原子核相比 ,单Λ超核和双Λ超核中超子提供的吸引力会相应地降低中子费米面 .所预言的中子滴线超核分别为77ΛCa和78ΛΛCa ,比原来预测的通常滴线核74Ca多两个中子 .基于对双中子分离能、中子密度分布、半径、单粒子能谱、轨道占据数和连续谱贡献的分析 。Ground state systemic properties of single Λ and double Λ hypernuclei for even N Ca isotopes ranging from the proton drip line to the neutron drip line are studied by using the relativistic continuum Hartree Bogoliubov theory with a density dependent δ pairing interaction. Compared with the ordinary nuclei, the predicted neutron drip line nuclei are 77 Λ Ca and 78 ΛΛ Ca respectively, i.e., the last bound hypernuclei has two more neutrons than that of ordinary nuclei. Based on the analysis of two neutron separation energies, neutron single particle energy levels, the contribution of continuum and nucleon density distribution, giant halo phenomena due to pairing correlation and the contribution from the continuum are suggested to exist in Ca hypernuclei.

关 键 词：相对论连续谱Hartree-Bogoliubov方法 巨中子晕 ∧超核 基态性质 吸引力 中子滴线 А∧Ca超核 А∧∧Ca超核 对偶中子数 

分 类 号：O571.2[理学—粒子物理与原子核物理]