| Exotic structure of the third excited state in ^21Na |
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| 作者姓名： | LI Xihan LIANG Yujie DENG Fuguo LIU Zuhua ZHOU Hongyu |
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| 作者单位： | [1]Key Laboratory of Beam Technology and Material Modification of Minister of Education, Beijing Normal University, Beijing 100875, China [2]Institute of Low Energy Nuclear Physics, and Department of Material Science and Engineering, Beijing Normal University, Beijing 100875, China [3]Beijing Radiation Center, Beijing 100875, China [4]China Institute of Atomic Energy, Beijing 102413, China |
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| 基金项目： | Acknowledgements This work was supported by the National Natural Science Foundation of China （Grant Nos. 10435020, 10254002, A0325401, 10075077, 10105016, and 10275092）, and the Major State Basic Research Development Program of China （Grant No. G200007400）. |
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| 摘 要： | The probability of the last proton being out of the binding potential, P and the root-mean-square （rms） radius （〈r^2〉^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 〈r^2〉^1/2=5.28 fm respectively. The P value and the contribution of the asymptotic part to the 〈r^2〉^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.
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| 关 键 词： | 钠 第三激发态 外部结构 有效半径 密度分布 渐近标准化系数 |
| 收稿时间： | 2005-06-21 |
| 修稿时间： | 2005-06-212005-08-08 |
Exotic structure of the third excited state in21Na |
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| LI Xihan LIANG Yujie DENG Fuguo LIU Zuhua ZHOU Hongyu.Exotic structure of the third excited state in ^21Na[J].Chinese Science Bulletin,2005,50(23):2677-2680. |
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| Authors: | Li Xihan Liang Yujie Deng Fuguo Liu Zuhua Zhou Hongyu |
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| Institution: | (1) Key Laboratory of Beam Technology and Material Modification of Minister of Education, Beijing Normal University, 100875 Beijing, China;(2) Institute of Low Energy Nuclear Physics, and Department of Material Science and Engineering, Beijing Normal University, 100875 Beijing, China;(3) Beijing Radiation Center, 100875 Beijing, China;(4) China Institute of Atomic Energy, 102413 Beijing, China |
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| Abstract: | The probability of the last proton being out of the binding potential, P and the root-mean-square (rms) ra- dius (1/2= of the third excited state in 21Na are calcu- lated 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 ex- cited state in 21Na is a proton halo state. |
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| Keywords: | halo state root-mean-square radius density distribution ANC |
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