The probability of the last proton being out of the binding potential, P and the root-mean-square (rms) ra- dius (<r2>1/2= of the third excited state in 21Na are calcu- lated by means of asymptotic normalization...The probability of the last proton being out of the binding potential, P and the root-mean-square (rms) ra- dius (<r2>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 <r2>1/2=5.28 fm respectively. The P value and the contribution of the asymptotic part to the <r2>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.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.10435020,10254002,A0325401,10075077,10105016,and 10275092)the Major State Basic Research Development Program of China(Grant No.G200007400).
文摘The probability of the last proton being out of the binding potential, P and the root-mean-square (rms) ra- dius (<r2>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 <r2>1/2=5.28 fm respectively. The P value and the contribution of the asymptotic part to the <r2>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.
