Many-body effects in nuclear structure
Departamento de Física Aplicada III, Universidad de Sevilla, Spain
2 Dipartimento di Fisica, Universitá di Milano, Italy
3 INFN Sezione di Milano, Italy
4 The Niels Bohr Insitute, University of Copenhagen, Denmark
* e-mail: Enrico.Vigezzi@mi.infn.it
We calculate, for the first time, the state-dependent pairing gap of a finite nucleus (120Sn) diagonalizing the bare nucleon-nucleon potential (Argonne v 14) in a Hartree-Fock basis (with effective k-mass ), within the framework of the generalized Bogoliubov-Valatin approximation including scattering states up to 800 MeV above the Fermi energy to achieve convergence. The resulting gap accounts for about half of the experimental gap. The combined effect of the bare nucleon-nucleon potential and of the induced pairing interaction arising from the exchange of low-lying surface vibrations between nucleons moving in time-reversal states close to the Fermi energy accounts for the experimental gap.
© Società Italiana di Fisica and Springer-Verlag, 2004