A nuclear structure model based on linear response theory (i.e., random phase approximation) and which includes pairing correlations and anharmonicities (coupling with collective vibrations), has been implemented in such a way that it can be applied on the same footing to magic as well as open-shell nuclei. As applications, we have chosen to study the dipole excitations both in well known, stable isotopes like 208Pb and 120Sn as well as in the neutron-rich, unstable 132Sn nucleus, by addressing in the latter case the question about the nature of the low-lying strength. Our results suggest that the model is reliable and predicts in all cases low-lying strength of non collective nature.

Dipole states in stable and unstable nuclei / D. Sarchi, P.F. Bortignon, G. Colò. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 601:1/2(2004 Nov 04), pp. 27-33. [10.1016/j.physletb.2004.09.019]

Dipole states in stable and unstable nuclei

P.F. Bortignon
Secondo
;
G. Colò
Ultimo
2004

Abstract

A nuclear structure model based on linear response theory (i.e., random phase approximation) and which includes pairing correlations and anharmonicities (coupling with collective vibrations), has been implemented in such a way that it can be applied on the same footing to magic as well as open-shell nuclei. As applications, we have chosen to study the dipole excitations both in well known, stable isotopes like 208Pb and 120Sn as well as in the neutron-rich, unstable 132Sn nucleus, by addressing in the latter case the question about the nature of the low-lying strength. Our results suggest that the model is reliable and predicts in all cases low-lying strength of non collective nature.
Giant resonances ; Hartree-Fock ; randon phase approximation
Settore FIS/04 - Fisica Nucleare e Subnucleare
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/143603
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