Investigation of Exotic Structure of the Largely Deformed Nucleus 23Al in the Relativistic-Mean-Field Model
CHEN Jin-Gen1,2,3, CAI Xiang-Zhou1, WANG Ting-Tai1,3, MA Yu-Gang1, REN Zhong-Zhou4, FANG De-Qing1, ZHONG Chen1, WEI Yi-Bin3, GUO Wei1,3, ZHOU Xing-Fei1,3,5, WANG Kun1,3, MA Guo-Liang1,3, TIAN Wen-Dong1, ZUO Jia-Xu1,3, MA Chun-Wang1,3, CHEN Jin-Hui1,3, YAN Ting-Zhi1,3, SHEN Wen-Qing1
1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800
2College of Science, Zhejiang Forestry University, Hangzhou 311300
3Graduate School of the Chinese Academy of Sciences
4Department of Physics, Nanjing University, Nanjing 210093
5College of Sciences, Ningbo University, Ningbo 315211
Investigation of Exotic Structure of the Largely Deformed Nucleus 23Al in the Relativistic-Mean-Field Model
1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800
2College of Science, Zhejiang Forestry University, Hangzhou 311300
3Graduate School of the Chinese Academy of Sciences
4Department of Physics, Nanjing University, Nanjing 210093
5College of Sciences, Ningbo University, Ningbo 315211
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.
2004, Vol. 21 
