Momentum dependence of the nuclear mean field

The dependence on the momentum of the nuclear mean field is studied in the framework of the self-consistent Bethe-Brueckner theory. It is pointed out that the rearrangement term, coming from the variation of the G matrix, gives a substantial contribution at the lowest momenta. The resulting single particle potential exhibits a good rate of convergence. Its momentum dependence appears to be negligible up to 2 ${\mathrm{fm}}^{\mathrm{-}1}$, in contrast with potentials used in calculations of heavy-ion collisions at intermediate energies.