Dipole states in stable and unstable nuclei

Details Dipole states in stable and unstable nuclei Dipole states in stable and unstable nuclei

2004-06-24

arxiv.org/abs/nucl-th/0406076v1

Physics

Nuclear Physics

Nuclear Theory

16 pages, 6 figures; submitted for publication

Scientific paper

10.1016/j.physletb.2004.09.019

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 $^{208}$Pb and $^{120}$Sn as well as in the neutron-rich, unstable $^{132}$Sn 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.

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