Pairing properties of realistic effective interactions
1 Istituto Nazionale di Fisica Nucleare, Complesso Universitario di Monte Sant’Angelo, Via Cintia, I-80126 Napoli, Italy
2 Dipartimento di Fisica, Università di Napoli Federico II, Complesso Universitario di Monte Sant’Angelo, Via Cintia, I-80126 Napoli, Italy
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Published online: 19 January 2016
We investigate the pairing properties of an effective shell-model interaction defined within a model space outside 132Sn and derived by means of perturbation theory from the CD-Bonn free nucleon-nucleon potential. It turns out that the neutron pairing component of the effective interaction is significantly weaker than the proton one, which accounts for the large pairing gap difference observed in the two-valence identical particle nuclei 134Sn and 134Te. The role of the contribution arising from one particle-one hole excitations in determining the pairing force is discussed and its microscopic structure is also analyzed in terms of the multipole decomposition.
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