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

Simple item page
dc.creatorTertychny, G.
dc.creatorTselyaev, V.
dc.creatorKamerdzhiev, S.
dc.creatorGruemmer, F.
dc.creatorKrewald, S.
dc.creatorSpeth, J.
dc.creatorAvdeenkov, A.
dc.creatorLitvinova, E.
dc.date2006-03-21
dc.date.accessioned2026-07-07T09:33:52Z
dc.date.available2026-07-07T09:33:52Z
dc.descriptionThe 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 $(γ,γ')$ 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 $(α,α'γ)$ 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.
dc.description6 figures
dc.identifierhttps://arxiv.org/abs/nucl-th/0603051
dc.identifierhttp://arxiv.org/abs/nucl-th/0603051
dc.identifierPhysics Letters B647 (2007) 104
dc.identifierdoi:10.1016/j.physletb.2007.01.069
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/159288
dc.subjectNuclear Theory
dc.titleMicroscopic description of the pygmy and giant electric dipole resonances in stable Ca isotopes
dc.typetext

Files

Collections

arXiv