^(11)Be的能级翻转与它的平均场  

Level Inversion and the Mean Field in ^(11)Be

作　　者：高早春[1] 陈永寿[1] 

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《高能物理与核物理》2003年第12期1100-1105,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 10 0 75 0 78;1993 5 0 3 0 ;10 0 470 0 1);国家重点基础研究发展规划项目 (G2 0 0 0 0 774)资助~~

摘　　要：讨论了单中子晕核11Be的能级翻转现象 ,指出晕核的单中子分离能Sn 与基态单中子的势阱内位置Dg 之间存在明显差别 .通过引进一种新的势阱———双MWS(ModifiedWoods Saxon)势 ,首次在平均场的层次上再现了11Be中 2s1 2 轨道与 1p1 2 轨道的翻转现象 ,而不再需要考虑当前普遍认为的组态混合解释 .由此认为 ,奇中子晕核中的能级次序翻转 ,反映了其平均场与稳定核的相比较存在着显著的差异 ,从而导致晕核体系反常壳结构的出现 .The inversion of 2s 1/2 and 1p 1/2 levels occurred in the one-neutron halo nucleus, 11Be, is studied in detail. It is pointed out that, for neutron halo nuclei, such as 11Be, the one neutron separation energy, S n, and the depth of the last neutron in the potential well, D g, should have quite different values. After the failure of the Woods-Saxon potential, we construct a new potential, called as Double modified-Woods-Saxon (DMWS) potential, to describe the mean field of 11Be, which has been able perfectly to reproduce this level inversion phenomenon without the help of configuration mixing. It has been shown that the level inversion in the 11Be may indicate that the halo nuclei have a quite different mean field in contrast to the stable ones.

关 键 词：能级翻转 单中子晕核 铍元素 单中子分离能 壳结构 平均场 原子核物理 

分 类 号：O571[理学—粒子物理与原子核物理]