dorsal/arxiv
View SchemaMicroscopic description of the pygmy and giant electric dipole resonances in stable Ca isotopes
| Authors | G. Tertychny, V. Tselyaev, S. Kamerdzhiev, F. Gruemmer, S. Krewald, J. Speth, A. Avdeenkov, E. Litvinova |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0603051 |
| URL | https://arxiv.org/abs/nucl-th/0603051 |
| DOI | 10.1016/j.physletb.2007.01.069 |
| Journal | Physics Letters B647 (2007) 104 |
Abstract
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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"abstract": "The properties of the pygmy (PDR) and giant dipole resonance (GDR)in the\nstable $^{40}Ca$,$^{44}Ca$ and $^{48}Ca$ isotopes have been calculated within\nthe \\emph{Extended Theory of Finite Fermi Systems}(ETFFS). This approach is\nbased on the random phase approximation (RPA) and includes the single particle\ncontinuum as well as the coupling to low-lying collectives states which are\nconsidered in a consistent microscopic way. For $^{44}Ca$ we also include\npairing correlations. We obtain good agreement with the experimental data for\nthe gross properties of both resonances. It is demonstrated that the recently\nmeasured A-dependence of the strength of the PDR below 10 MeV is well\nunderstood in our model:due to the phonon coupling some of the strength in\n$^{48}Ca$ is simply shifted beyond 10 MeV. The predicted fragmentation of the\nPDR can be investigated in $(e,e\u0027)$ and $(\\gamma ,\\gamma\u0027)$ experiments.\nWhereas the isovector dipole strength of the PDR is small in all Ca isotopes,\nwe find in this region surprisingly strong isoscalar dipole states, in\nagreement with an $(\\alpha,\\alpha\u0027\\gamma)$ experiment. We conclude that for the\ndetailed understanding of the structure of excited nuclei e.g. the PDR and GDR\nan approach like the present one is absolutely necessary.",
"arxiv_id": "nucl-th/0603051",
"authors": [
"G. Tertychny",
"V. Tselyaev",
"S. Kamerdzhiev",
"F. Gruemmer",
"S. Krewald",
"J. Speth",
"A. Avdeenkov",
"E. Litvinova"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/j.physletb.2007.01.069",
"journal_ref": "Physics Letters B647 (2007) 104",
"title": "Microscopic description of the pygmy and giant electric dipole resonances in stable Ca isotopes",
"url": "https://arxiv.org/abs/nucl-th/0603051"
},
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