Abstract
Giant resonances are understood as superposition of particle-hole excitations. The empirical systematics indicates that the associated spreading widths are considerably smaller than the sum of typical widths of single-particle and single-hole states, and that the centroid energy is in good agreement with the RPA predictions. These results imply a destructive interference between the different contributions to the mass operator associated with collective vibrations. We study the properties of the mechanism responsible for this quenching by inspecting contributions to the mass operator in the semiclassical limit of large single-particle angular momenta.
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