par Tajima, Naoki;Flocard, Hubert;Bonche, Paul;Dobaczewski, Jacek;Heenen, Paul-Henri 
Référence Nuclear Physics A, 542, 3, page (7355-367)
Publication Publié, 1992
Référence Nuclear Physics A, 542, 3, page (7355-367)
Publication Publié, 1992
Article révisé par les pairs
| Résumé : | We give a method with which the matrix elements of operators between BCS states can be evaluated with the generalized Wick's theorem even when the excitation of a pair of quasiparticles leads to a vanishing of the overlap. We analyze the behavior of the mean field and the pairing contributions to the matrix elements of two-body operators versus the gauge angle of the orbital and find that each of them diverges as the overlap vanishes while their sum remains finite. A new definition of these quantities is proposed which removes the divergence occurring at zero overlap. A numerical application to a deformed heavy nucleus is done, which tests the feasibility of our prescription. |
