Abstract
The many-body problem for finite systems is discussed from a point of view which is largely that of the intermediate-coupling and configuration-mixing shell models. Emphasis is placed upon the determination of excitation spectra for two simple systems, the singlehole system and the single-particle system. It is shown how the spectra for these are obtained by passing from pure independent model to quasiparticle model and thence to representations of the real states. The configuration mixing of the description is generated by allowing for the existence of density correlations in the many-body system. Such correlations manifest themselves as the oscillations of the nuclear surface. Single-particle (hole) excitations are altered by the presence of these collective motions. Other, noncollective, configurations serving to modify the single-particle spectrum are also discussed.
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