Abstract
Abstract The single and multiple excitations of giant resonances in heavy ion reactions is investigated in the framework of a microscopic model. The scattering process is treated semi-classically as in the Copenhagen model but the target response is constructed from a microscopic RPA calculation using Skyrme forces. The importance of an accurate description of excitation operators and transition form factors is stressed. The connection with other approaches (time-dependent Hartree-Fock approximation, boson expansion method, second RPA) is discussed. The model is applied to reactions involving 208 Pb and 40 Ca nuclei. We conclude that, under near-grazing conditions, with medium or heavy projectiles and for incident energies around 30 MeV/nucleon, there is a substantial probability of observing multiphonon states built on 2 7z.xl;hω giant resonances.
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