Advances in s-process models

Within the framework of the current models for the slow neutron capture (s) process in Asymptotic Giant Branch (AGB) stars we explore the uncertainties introduced by the assumptions made on stellar modeling. On the basis of star models constructed with three different evolutionary codes we generate detailed neutron-capture nucleosynthesis post-processing models. The main difference among the codes is that one of them includes an overshooting mechanism. As a result, the neutron fluxes are stronger both during the interpulse periods and within thermal pulses. The efficiency of the C13 source is also studied and we find that a linear relationship exists between the initial C12 in the intershell and the maximum number of neutrons produced.