Understanding isospin transport ratio: Influence of fast emissionsand statistical de-excitation

We report on one of the main techniques used to estimate theneutron-proton equilibration in heavy-ion collision: the so-called isospin transportratio, which is expected to bypass any perturbations introducing a linear transforma-tion of the chosen observable. In this proceeding, we will focus on the perturbationsintroduced by fast and statistical emissions that occur after the projectile-targetseparation, when the equilibration is already established. We chose Ca-40,Ca-48+(40,48)Caat 35 MeV/nucleon as a bench test, adopting a full model scheme based on the An-tisymmetrized Molecular Dynamics models coupled with several statistical codes.Using the n-p ratio (N/Z) of the Quasi-Projectile as an isospin sensitive observable,we observed a perturbation introduced by the statistical de-excitation of the pri-mary fragments at relatively low excitation energies (below 2 MeV/nucleon), whilefast and more dynamical emissions after the projectile-target separation introducedsome perturbation once the centrality of the events increased.