P. Vesely

Description of the dipole giant resonance in heavy and superheavy nuclei within Skyrme random-phase approximation

W. Kleinig, V.O. Nesterenko, J. Kvasil, P.-G. Reinhard and P. Vesely 1 Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow region, 141980, Russia∗ 2 Technische Universität Dresden, Inst. für Analysis, D-01062, Dresden, Germany 3 Institute of Particle and Nuclear Physics, Charles University, CZ-18000, Praha 8, Czech Republic and 4 Institut für Theoretische Physik II, Universität Erlangen, D-91058, Erlangen, Germany (Dated: May 30, 2008)

Spin-flip M1 giant resonance as a challenge for Skyrme forces

Despite a great success of the Skyrme mean-field approach in the exploration of nuclear dynamics, it seems to fail in the description of the spin-flip M1 giant resonance. The results for different Skyrme parameterizations are contradictory and poorly agree with experiment. In particular, there is no parameterization which simultaneously describes the one-peak gross structure of M1 strength in doubly magic nuclei and two-peak structure in heavy deformed nuclei. The reason of this mismatch could lie in an unsatisfactory treatment of spin correlations and spin–orbit interaction. We discuss the present status of the problem and possible ways of its solution. In particular, we inspect (i) the interplay of the collective shift and spin–orbit splitting, (ii) the isovector M1 response versus isospin-mixed responses and (iii) the role of tensor and isovector spin–orbit interaction.

TDDFT with Skyrme forces: Effect of time-odd densities on electric giant resonances

Time-odd densities and their effect on electric giant resonances are investigated within the self-consistent separable random-phase-approximation (SRPA) for a variety of Skyrme forces (SkT6, SkO, SkM*, SIII, SGII, SLy4, SLy6, SkI3). Time-odd densities are essential for maintaining the Galilean invariance of the Skyrme functional. Their contribution is determined by the values and signs of the isovector and isoscalar effective-mass parameters of the force. In even-even nuclei these densities are not active in the ground state but can affect the dynamics. As a particular case, we explore the role of the current density in the description of isovector E1 and isoscalar E2 giant resonances in a chain of spherical and deformed Nd isotopes with A=134-158. The relation of the current to the effective masses and relevant parameters of the Skyrme functional is analyzed. It is shown that the current contributes substantially to E1 and E2 and the contribution is the same for all the isotopes along the chain, i.e. for both standard and exotic nuclei.

Skyrme-Rpa Description of Spin-Flip M1 Giant Resonance

The spin-flip

Giant dipole resonance in deformed nuclei: dependence on Skyrme forces

M1

Self-consistent separable random-phase approximation for Skyrme forces: Giant resonances in axial nuclei

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 (

SKYRME-RANDOM-PHASE-APPROXIMATION DESCRIPTION OF E1 STRENGTH IN 92–100Mo

mathrm{SkT}6

SKYRME-RANDOM-PHASE-APPROXIMATION DESCRIPTION OF SPIN-FLIP AND ORBITAL M1 GIANT RESONANCES

,

SELF-CONSISTENT SEPARABLE RPA FOR SKYRME FORCES: GIANT RESONANCES IN AXIAL NUCLEI

mathrm{SkM}*

Charged-current neutrino and antineutrino scattering off Cd-116 described by Skyrme forces

,