Abstract
The spin-flip giant resonance is explored in the framework of the random-phase-approximation (RPA) on the basis of the Skyrme energy functional. A representative set of eight Skyrme parametrizations (, , , , , , , and -bas) is used. Light and heavy, spherical and deformed nuclei (, , , and ) are considered. The calculations show that spin densities play a crucial role in forming the collective shift in the spectrum. The interplay of the collective shift and spin-orbit splitting determines the quality of the description. None of the considered Skyrme parametrizations is able to describe simultaneously the strength distribution in closed-shell and open-shell nuclei. It is found that the problem lies in the relative positions of proton and neutron spin-orbit splitting. This calls for a better modeling of the tensor and isovector spin-orbit interaction.
- Received 6 July 2009
DOI:https://doi.org/10.1103/PhysRevC.80.031302
©2009 American Physical Society