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| Home > Publications database > Microscopic description of the low lying and high lying electric dipole strength in stable Ca isotopes |
| Journal Article | PreJuSER-59159 |
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2007
North-Holland Publ.
Amsterdam
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Please use a persistent id in citations: doi:10.1016/j.physletb.2007.01.069
Abstract: The properties of the low lying and high lying electric dipole strength in the stable Ca-40, Ca-44 and Ca-48 isotopes have been calculated within the 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 collective states which are considered in a consistent microscopic way. For Ca-44 we also include pairing correlations. We obtain good agreement with the existing experimental data for the gross properties of the low lying and high lying strength. It is demonstrated that the recently measured A-dependence of the electric dipole strength below 10 MeV is well understood in our model: due to the phonon coupling some of the strength in Ca-48 is simply shifted beyond 10 MeV The predicted fragmentation of the strength can be investigated in (e, e') and (gamma, gamma') experiments. The isovector dipole strength below 10 MeV is small in all Ca isotopes. Surprisingly, the proton and neutron transition densities of these low lying electric dipole states are in phase, which indicate isoscalar structure. We conclude that for the detailed understanding of the structure of excited nuclei e.g. the low lying and high lying electric dipole strength an approach like the present one is absolutely necessary. (c) 2007 Elsevier B.V. All rights reserved.
Keyword(s): J ; microscopic theory (auto) ; low lying electric dipole strength and giant electric dipole resonances (auto) ; single-particle continuum (auto) ; transition densities (auto)
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