Abstract
A consistent generalization of the random phase approximation (RPA) for odd nuclei is suggested. The derivation is based on the Green function method using the equation for the three-particle Green function. The model developed combines properties of both the standard RPA, and the particle-vibration coupling model. This gives a possibility to describe both the single-particle and collective parts of the excitation spectrum including giant resonances in the continuum and splitting of discrete collective states [particle (hole) phonon multiplets] on a common basis. In the framework of this model, where the single-particle continuum is taken into account exactly, the photoabsorption cross section and the isoscalar resonance in are calculated. The comparative RPA calculations of the same modes in nucleus are presented. The results obtained are compared with experiment for the resonance in and For the isoscalar strength in we obtained an additional and noticeable low-lying contribution below 12.5 MeV caused by the odd neutron only.
- Received 22 September 2000
DOI:https://doi.org/10.1103/PhysRevC.63.034304
©2001 American Physical Society