Service de Physique Nucleaire, Universite Libre de Bruxelles, Belgium
Why and how to go beyond the mean-field method.
Applications to neutron deficient Pb isotopes
The Hartree-Fock Bogoliubov method with effective interactions has been
extremely successful in the description of the properties of exotic nuclei.
However, to work in an intrinsic system of reference has several drawbacks
and is justified only for nuclei with well defined deformation. The main
deficiencies of the wave functions are that they are not eigenstates of
angular momentum and particle number and that they have a fixed deformation.
A single framework permits to cure these deficiencies: the generator
coordinate method, which is equivalent to a configuration mixing method. I
will show how this can be done in the particular mean-field method based on
Skyrme interactions and on a discretization on a 3-dimensional mesh that has
been developed by the Brussels-Paris collaboration. On specific examples, I
will compare calculations of spectra and transition probabilities directory
in the laboratory frame of reference to experimental data. Finally, I will
discuss how to calculate systematically the correlation energies due to
angular momentum projection and to quadrupolar vibrations in order to
incorporate them in a microscopic theory of nuclear masses.
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