The Relativistic Hartree—Fock Approach
Too small a value of the symmetry energy is obtained if the coupling constant g p takes its experimental value. In fact, important contributions due to exchange (Fock) terms and p -N tensor coupling are missing in this approach (see, however, Sect. 5.1).
Though the spin orbit force is globally rather well described, this theory is unable to reproduce reasonably well the reduction of d-state splitting when going from 40Ca to 48Ca.
The mean-field approach cannot take into account the effective spinspin interaction that arises from the identity of the nucleons through the antisymmetrization of the wave function. This effect is more important in spin-unsaturated systems .
The Hartree approximation, in principle, corresponds only to instantaneous interaction (without retardation)1.
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