Skyrme random-phase-approximation description of spin-flip M1 giant resonance

Journal Article · Tue Sep 15 04:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.031302· OSTI ID:21293796

Vesely, P; Kvasil, J ^[1]; Nesterenko, V O ^[2]; Kleinig, W ^[2]; Reinhard, P -G ^[3]; Ponomarev, V Yu ^[4]

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1. Institute of Particle and Nuclear Physics, Charles University, CZ-18000, Praha 8 (Czech Republic)
2. Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow region, RU-141980 (Russian Federation)
3. Institut fuer Theoretische Physik II, Universitaet Erlangen, D-91058 Erlangen (Germany)
4. Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt (Germany)

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 ({sup 48}Ca, {sup 158}Gd, {sup 208}Pb, and {sup 238}U) 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.

• OSTI ID: 21293796
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 80; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CALCIUM 48
DEFORMED NUCLEI
DENSITY
DISTRIBUTION
GADOLINIUM 158
GIANT RESONANCE
ISOVECTORS
L-S COUPLING
LEAD 208
NEUTRONS
ORBITS
PROTONS
RANDOM PHASE APPROXIMATION
SIMULATION
SKYRME POTENTIAL
SPECTRA
SPHERICAL CONFIGURATION
SPIN
SPIN FLIP
URANIUM 238