  Constraint Molecular dynamics CoMD calculations have been performed for
asymmetric nuclear matter (NM) by using a simple effective interactions of the
Skyrme type. The set of parameter values reproducing common accepted saturation
properties of nuclear matter have been obtained for different degree of
stiffness characterizing the iso-vectorial potential density dependence. A
comparison with results obtained in the limit of the Semi-Classical Mean Field
approximation using the same kind of interaction put in evidence the role
played by the many-body correlations in to explain the noticeable differences
obtained in the parameter values in the two cases. Even if from a numerical
point of view the obtained results are strictly valid for the CoMD model, some
rather general feature of the discussed correlations can give a wider meaning
to the obtained differences being strongly related to the spacial correlations
generated in the semiclassical wave packets dynamics.
