北京大学学报(自然科学版)

多Λ超核基态性质的研究

吕洪凤1,张双全2,李志攀2   

  1. 1. 中国农业大学理学院, 北京100083; 2. 北京大学物理学院技术物理系,北京100871;
  • 收稿日期:2008-06-04 出版日期:2009-09-20 发布日期:2009-09-20

Properties of Multi-Lambda Hypernuclei

LvHongfeng1, ZHANG Shuangquan2, LI Zhipan2   

  1. 1. Department of Applied Physics, College of Science, Chinese Agriculture University, Beijing 100083; 2. Department of Technical Physics, School of Physics, Peking University, Beijing 100871;
  • Received:2008-06-04 Online:2009-09-20 Published:2009-09-20

摘要: 依据多Λ超核在高能重离子碰撞或天体物理中实现的可能性, 以Ca为例, 用相对论连续谱Hartree-Bogoliubov理论研究了系统的基态性质, 包括每重子结合能、重子均方根半径和超核物质半径 以及单粒子能谱等。研究表明, 随着超子数目的增加, 超核的每重子结合能和超子均方根半径变化趋势平缓, 在5010ΛCa等一些超核内超子2s1/2和1d5/2能级排列有明显的反转, 丰质子区和总核子数不变的多Λ钙超核滴线所对应的最大超子数分别为6和22。

关键词: 相对论连续谱Hartree-Bogoliubov理论, 多Λ超核, 滴线超核

Abstract: Properties of multi-Lambda Ca hypernuclei are studied in the relativistic continuum Hartree-Bogoliubov theory. The binding energy per baryon and the hyperon radius are found to change smoothly with the increasing of hyperon number. An obviously reversed arrangement of hyperonic states 2s1/2 and 1d5/2 are found,e.g.,in 50 5010ΛCa. The predicted drip-line hypernuclei from proton-rich side and constant nucleon number side are respectively 40Ca and 6622ΛCa.

Key words: relativistic continuum Hartree-Bogoliubov theory, multi-Lambda hypernuclei, dripline hypernuclei

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