Microscopic description of the pygmy and giant electric dipole resonances in stable Ca isotopes

Details Microscopic description of the pygmy and giant electric dipole resonances in stable Ca isotopes Microscopic description of the pygmy and giant electric dipole resonances in stable Ca isotopes

2006-03-21

arxiv.org/abs/nucl-th/0603051v1

Physics Letters B647 (2007) 104

Physics

Nuclear Physics

Nuclear Theory

6 figures

Scientific paper

10.1016/j.physletb.2007.01.069

The properties of the pygmy (PDR) and giant dipole resonance (GDR)in the stable $^{40}Ca$,$^{44}Ca$ and $^{48}Ca$ isotopes have been calculated within the \emph{Extended Theory of Finite Fermi Systems}(ETFFS). This approach is based on the random phase approximation (RPA) and includes the single particle continuum as well as the coupling to low-lying collectives states which are considered in a consistent microscopic way. For $^{44}Ca$ we also include pairing correlations. We obtain good agreement with the experimental data for the gross properties of both resonances. It is demonstrated that the recently measured A-dependence of the strength of the PDR below 10 MeV is well understood in our model:due to the phonon coupling some of the strength in $^{48}Ca$ is simply shifted beyond 10 MeV. The predicted fragmentation of the PDR can be investigated in $(e,e')$ and $(\gamma ,\gamma')$ experiments. Whereas the isovector dipole strength of the PDR is small in all Ca isotopes, we find in this region surprisingly strong isoscalar dipole states, in agreement with an $(\alpha,\alpha'\gamma)$ experiment. We conclude that for the detailed understanding of the structure of excited nuclei e.g. the PDR and GDR an approach like the present one is absolutely necessary.

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