Theoretical Analysis of the Exotic Structure of ¹⁷F

The first excited state and the ground state of ⁷F are studied with the asymptotic normalization coefficient method. The results show that the probabilities of the last proton being out of the binding potential in both the states are P=59.71% and P=27.61%, respectively. This means that the last nucleon in both the states of ¹⁷F is far-extended beyond the range of nuclear force, especially in the first excited state. This result is also verified by the calculation of the density distributions of the last proton in ¹⁷F. It is quantitatively confirmed that the first excited state of ¹⁷F is a nuclear halo state and its ground state is a proton skin state.