Research on the halo in ~(31)Ne with the complex momentum representation method

摘要

Halo is one of the most interesting phenomena in exotic nuclei especially for ~(31)Ne, which is deemed to be a halo nucleus formed by a p-wave resonance. However, the theoretical calculations do not suggest a p-wave resonance using the scattering phase shift approach or complex scaling method. Here, we apply the complex momentum representation method to explore resonances in ~(31)Ne. We have calculated the single-particle energies for bound and resonant states together with their evolutions with deformation. The results show that the p-wave resonances appear clearly in the complex momentum plane accompanied by a p-f inversion in the single-particle levels. Because the p-f inversion happens, calculated energy, width, and occupation probabilities of major components in the level occupied by the valance neutron support a p-wave halo for ~(31)Ne.