Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-07-09
Physics
Nuclear Physics
Nuclear Theory
To appear in the proceedings of the 10th international conference on nuclear reaction mechanisms, Varenna 2003
Scientific paper
The Faddeev technique is employed to study the influence of both particle-particle and particle-hole phonons on the one-hole spectral function of 16O. The formalism includes the effects of nuclear fragmentation and accounts for collective excitations at a random phase approximation (RPA) level. The latter are subsequently summed to all orders by the Faddeev equations to obtain the nucleon self-energy. The results indicate that the characteristics of hole fragmentation are related to the low-lying states of 16O and an improvement of the description of this spectrum is required to understand the details of the experimental strength distribution. A first calculation to improve on this includes the mixing of two-phonon configuration with particle-hole ones. It is seen that this allows to understand the formation of excited states which cannot be described by the RPA approach.
Barbieri Carlo
Dickhoff W. H.
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