Abstract
The probability of the last proton being out of the binding potential,P and the root-mean-square (rms) radius («r2»1/2= of the third excited state in21Na are calculated 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. TheP value and the contribution of the asymptotic part to the «r2»1/2 are compared with those of several other low energy states in21Na. It is found that the valence particle in the third excited state has an obvious largerP than those of other states. The density distribution of the valence proton in this state is also compared with the nucleons in the nuclear core20Ne, and a far extended tail can be seen clearly. These results show that the third excited state in21Na is a proton halo state.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
