Nuclear matter equations of state based on Skyrme, Myers-Swiatecki andTondeur interactions are written as polynomials of the cubic root of density,with coefficients that are functions of the relative neutron excess $\delta$.In the extrapolation toward states far away from the standard one, it is shownthat the asymmetry dependence of the critical point ($\rho_c, \delta_c$)depends on the model used. However, when the equations of state are fitted tothe same standard state, the value of $\delta_c$ is almost the same in Skyrmeand in Myers-Swiatecki interactions, while is much lower in Tondeurinteraction. Furthermore, $\delta_c$ does not depend sensitively on the choiceof the parameter $\gamma$ in Skyrme interaction.
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