Abstract
Self-consistent mean-field models are able to reproduce well the overall properties of nuclei for a wide range of masses. Nevertheless, they are intrinsically unsuitable for the description of some important observables like the single-particle strength distribution or, in connection with collective states, their damping width and their gamma decay to the ground state or to low lying states. For this reason, a completely microscopic approach beyond mean- field has been implemented recently, based on the Skyrme functional.When beyond mean-field theories are handled, the mean-field-fitted effective interaction should be refitted at the desired level of approximation. If zero-range interactions are used, divergences arise. We present some steps towards the refitting of Skyrme interactions, for its application in finite nuclei.
Highlights
Self-consistent mean-field (SCMF) models [1] have become increasingly reliable in the descriptions of ground state and of high-energy collective states, as giant resonances (GRs)
The giant resonances widths within the particle-vibration coupling (PVC) approach we present the results obtained for two observables: the strength function of the isoscalar giant quadrupole resonance (ISGQR) in 208Pb, and the γ-decay width of the ISGQR in 208Pb to the ground state and to the first collective octupole state
It should be noted that only the direct decay, not the statistical one coming from the compund nucleus, can be computed in this model [11]. In this contribution we focus on the ISGQR in 208Pb and its decay to the ground state and to the first 3− state, using different Skyrme interactions
Summary
Self-consistent mean-field (SCMF) models [1] have become increasingly reliable in the descriptions of ground state (masses, radii, deformations) and of high-energy collective states, as giant resonances (GRs). A possible solution which can be used to overcome these drawbacks is the inclusion of beyond mean-field (BMF) correlations produced by the interweaving between single particle states and collective phonons. Some of us has developed a fully microscopic selfconsistent model, based on Skyrme functionals, to treat properly single particle states [4].
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