Exotic structure of the third excited state in 21Na
The probability of the last proton being out of the binding potential, P and the root-mean-square (rms) radius (1/2= of the third excited state in 21Na are calculated by means of asymptotic normalization coefficient (ANC)method with the experimental date existing. The results are P=54.73% and 1/2=5.28 fm respectively. The P value and the contribution of the asymptotic part to the 1/2 are compared with those of several other low energy states in 21Na.It is found that the valence particle in the third excited state has an obvious larger P than those of other states. The density distribution of the valence proton in this state is also compared with the nucleons in the nuclear core 20Ne, and a far extended tail can be seen clearly. These results show that the third excited state in 21Na is a proton halo state.
作 者: LI Xihan LIANG Yujie DENG Fuguo LIU Zuhua ZHOU Hongyu 作者单位: LI Xihan,LIANG Yujie,DENG Fuguo,ZHOU Hongyu(Key Laboratory of Beam Technology and Material Modification of Minister of Education, Beijing Normal University, Beijing 100875,China;Institute of Low Energy Nuclear Physics, and Department of Material Science and Engineering, Beijing Normal University, Beijing 100875,China;Beijing Radiation Center, Beijing 100875, China)LIU Zuhua(Key Laboratory of Beam Technology and Material Modification of Minister of Education, Beijing Normal University, Beijing 100875,China;China Institute of Atomic Energy, Beijing 102413, China)
刊 名: 科学通报(英文版) SCI 英文刊名: CHINESE SCIENCE BULLETIN 年,卷(期): 2005 50(23) 分类号: O4 关键词: halo state root-mean-square radius density distribution ANC