On a simplified effective neutron-proton interaction including core-polarization effects for odd-odd deformed nuclei

Abstract

It is well known that the description of odd-odd deformed nuclei is not satisfactory if the usual one-parameter δ-force is used as the residual neutron-proton interaction. In this letter we show that, starting with a simple δ force, an improvement can be obtained which takes into account polarization effects of the core, as well as possible tensor and spin-orbit force effects, and which introduces only one additional parameter. This improvement is even better than that obtained with a finite range central-plus-tensor force, which introduces four additional parameters.