Investigation of Exotic Structure of the Largely Deformed Nucleus 23Al in the Relativistic-Mean-Field Model
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CHEN Jin-Gen,
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CAI Xiang-Zhou,
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WANG Ting-Tai,
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MA Yu-Gang,
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REN Zhong-Zhou,
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FANG De-Qing,
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ZHONG Chen,
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WEI Yi-Bin,
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GUO Wei,
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ZHOU Xing-Fei,
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WANG Kun,
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MA Guo-Liang,
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TIAN Wen-Dong,
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ZUO Jia-Xu,
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MA Chun-Wang,
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CHEN Jin-Hui,
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YAN Ting-Zhi,
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SHEN Wen-Qing
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Abstract
A candidate for proton halo nucleus 23Al is investigated based on the constrained calculations in the framework of the deformed relativistic mean field (RMF) model with the NL075 parameter set. It is shown by the constrained calculations that the ground state of 23Al has a large deformation that corresponds to the prolate shape. With that large deformation, the non-constrained RMF calculation predicts that there appears an inversion between the 2s1/2 211 and 1d5/2 202 shells. The valence proton of 23Al is weakly bound and occupies 2s1/2 211 and 1d5/2 202 with the weights of 56% and 29%, respectively. The calculated RMS radius for matter is in agreement with the experimental one. It is also predicted that the difference between the proton RMS radius and the neutron one is very large. This suggests that there exists a proton halo in 23Al.
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