  For a better understanding of the dynamics of exotic nuclei it is of crucial
importance to develop a practical microscopic theory easy to be applied to a
wide range of masses. Theoretically the basic task consists in formulating an
easy solvable theory able to reproduce structures and transitions of known
nuclei which should be then used to calculate the sparely known properties of
proton- or neutron-rich nuclei. In this paper we start by calculating energies
and distributions of A\leq4 nuclei withing a unitary correlation model
restricted to include only two-body correlations. The structure of complex
nuclei is then calculated extending the model to include correlation effects of
higher order.
