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Collectivity of the low-lying dipole strength in relativistic random phase approximation
Vretenar, D, Paar, N, Ring, P, Lalazissis, G A
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Abstract
The relativistic random phase approximation is applied in the analysis of the evolution of the isovector dipole response in nuclei with a large neutron excess. The self-consistent framework of relativistic mean-field theory, which has been very successfully applied in the description of ground-state properties of nuclei far from the valley of $\\beta$-stability, is extended to study the possible onset of low-energy collective isovector dipole modes in nuclei with extreme isospin values.