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   作者單位： 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： 科學通報（英文版）  SCI 英文刊名： CHINESE SCIENCE BULLETIN  年，卷(期)： 2005 50(23)  分類號： O4  關鍵詞： halo state   root-mean-square radius   density distribution   ANC  

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