Pairing correlations with the Gogny forceN. Pillet1, J.-F. Berger1, E. Caurier2, H. Goutte1, N. Sandulescu3 and P. Schuck4
1 DPTA/Service de Physique nucléaire, CEA/DAM Île-de-France, BP. 12, 91680 Bruyères-le-Châtel, France
2 Département Recherches Subatomiques, Institut Pluridisciplinaire Hubert Curien, 23 rue du Loess, BP. 28, 67037 Strasbourg, France
3 Institute of Physics and Nuclear Engineering, 76900 Bucharest, Romania
4 Institut de Physique Nucléaire, CNRS UMR 8608, 91406 Orsay, France
Published online: 21 May 2008
In this contribution we present two separated studies that deal with pairing correlations. The first one corresponds to a new development that aims to include correlations beyond mean field in an unified way and which is called Variational multiparticle-multihole (mpmh) configuration mixing method. Its main characteristic is that it conserves explicitly particle numbers unlike the usual HFB or BCS approaches. A comparison with BCS calculations shows that it is able to restore many correlations in weak pairing regime. The second study is devoted to the localisation and size of Cooper pairs in nuclei. We have defined the Cooper pair wave function in HFB approach. The main feature is that we obtain a shrinking of Cooper pair size (that is of the order of 2-3 fm) at the nuclei surface compare to the center of the nucleus.
© CEA 2008