Journal
PHYSICAL REVIEW C
Volume 80, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.80.031302
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Funding
- Heisenberg-Landau (Germany-BLTP JINR)
- Votruba-Blokhintsev (Czech Republic-BLTP JINR)
- BMBF [06 DD 139D, 06 ER 808]
- MSM 0021620859 (Ministry of Education of the Czech Republic)
- Czech grant agency [202/06/0363]
- DFG [SFB 634]
- [DFG-322/111]
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The spin-flip M1 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 (SkT6, SkM*, SLy6, SG2, SkO, SkO', SkI4, and SV-bas) is used. Light and heavy, spherical and deformed nuclei (Ca-48, Gd-158, Pb-208, and U-238) 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 M1 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.
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