Abstract
Abstract Two different choices of the functional, used in the variational approach to the nuclear many-body problem, namely the energy and the dispersion, are compared in the context of variation before and after projection and projected one-particle-one-hole configuration mixing techniques in the exactly solvable three-level model of interacting fermions. The results suggest that the minimization of the dispersion yields states, which are superior for projection after variation and configuration mixing calculations.
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