Intermediate Structure and Particle-Hole States in Nuclear Reactions
Oct 20, 196819 pages
Published in:
- Phys.Rev. 174 (1968) 1227-1246
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Abstract: (APS)
The effects of nuclear two-particle-one-hole (2p-1h) states on the energy-averaged cross section are studied to see when they cause observable fluctuations. This is done by using the self-consistent perturbation methods of Brueckner to derive an optical potential for the elastic scattering of neutrons. It is then shown that for the case where the interaction between different 2p-1h states can be neglected and the coupling to more complicated configurations is small, the scattering matrix can be approximated to second order in the interaction by a slowly varying background term plus a resonant term. The width of this resonant term is shown to be equal to the escape width plus a spreading width caused by the coupling to the more complicated configurations. These widths are calculated for a number of 2p-1h configurations in various spherical nuclei in order to determine when the isolated resonance condition (ΓReferences(21)
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