Abstract
Mottelson in 19681 proposed the ideas of a nuclear field theory (NFT) as a theoretical scheme to treat the collective (Phonon pr particle-hole) and single-particle modes (fields) coupling. This theory was subsequently proliferated by the Copenhagen — Buenos Aires group into a diagrammatic perturbation theory (DPT)2. The central theme of the DPT is to introduce a set of “empirical” rules for the evaluation of the NFT diagrams.
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