A Neutron Halo in ^(12)B Excited State  

作　　者：CHEN Bao-qiu, MA Zhong-yu 

出　　处：《Annual Report of China Institute of Atomic Energy》2001年第0期26-26,共1页中国原子能科学研究院年报（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No.10075080,19847002,19835010); Major State Basic Research Development Program in China(G20000774)

摘　　要：Nonlinear relativistic mean field(RMF) theory with a new effective interaction NL3 has been used to investigate the bulk properties of 12B nucleus and its daughter nuclei. The results obtained in RMF indicate one neutron halo in 12B nucleus at an excited state. The density distribution of neutrons in the excited state of 12B has a long tail and the nucleon in 2s1/2 state has very small separation energy. The rms radius of halo neutron is about twice larger than that of matter. Meanwhile, it becomes more apparent that nuclear halo is a general feature of loosely bound nuclei. As the binding energy becomes smaller, to form a bound state the nucleon tends to occupy a state with a low angular momentum.

关 键 词：NUCLEUS nuclei neutron RELATIVISTIC excited MOMENTUM angular DAUGHTER APPARENT OCCUPY 

分 类 号：O571[理学—粒子物理与原子核物理]