Interfering Doorway States and Giant Resonances. I: Resonance Spectrum and Multipole Strengths

Details Interfering Doorway States and Giant Resonances. I: Resonance Spectrum and Multipole Strengths Interfering Doorway States and Giant Resonances. I: Resonance Spectrum and Multipole Strengths

1997-04-17

arxiv.org/abs/nucl-th/9704036v1

Phys.Rev.C56:1031-1043,1997

Physics

Nuclear Physics

Nuclear Theory

20 pages, LaTeX, 3 ps-figures, to appear in PRC (July 1997)

Scientific paper

10.1103/PhysRevC.56.1031

A phenomenological schematic model of multipole giant resonances (GR) is considered which treats the external interaction via common decay channels on the same footing as the coherent part of the internal residual interaction. The damping due to the coupling to the sea of complicated states is neglected. As a result, the formation of GR is governed by the interplay and competition of two kinds of collectivity, the internal and the external one. The mixing of the doorway components of a GR due to the external interaction influences significantly their multipole strengths, widths and positions in energy. In particular, a narrow resonance state with an appreciable multipole strength is formed when the doorway components strongly overlap.

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