The first excited single-proton resonance in 15F by complex-scaled Green's function method * * Supported by the National Natural Science Foundation of China (11975167, 11935001, 11535004, 11761161001), the National Key R&D Program of China (2018YFA0404403) and the Science and Technology Development Fund of Macau (008/2017/AFJ)

Abstract

The complex-scaled Green's function (CGF) method is employed to explore the single-proton resonance in 15F. Special attention is paid to the first excited resonant state 5/2+, which has been widely studied in both theory and experiments. However, past studies generally overestimated the width of the 5/2+ state. The predicted energy and width of the first excited resonant state 5/2+ by the CGF method are both in good agreement with the experimental value and close to Fortune's new estimation. Furthermore, the influence of the potential parameters and quadruple deformation effects on the resonant states are investigated in detail, which is helpful to the study of the shell structure evolution.