IReS, Strasbourg

The need of three-body forces forces in nuclei.

Exact and quasi-exact solutions for A<12 have established the irrefutable need of genuine (as opposed to effective) three-body interaction. The resulting computational difficulties are potentially prohibitive. However, in a shell model context, it can be shown that a very simple three-body monopole term can solve practically all the spectroscopic problems---in the $p$, $sd$ and $pf$ shells---that were hitherto assumed to need drastic revisions of the realistic (two-body) potentials.