The role of overshooting treatment in the s-process weak component efficiency

Using a new s-nucleosynthesis code simulations have been performed to study the impact of overshooting convective on the s-process during core He-burning of a 25 M⊙ star (ZAMS mass) with initial Z = 0.02 metallicity. Attention has been devoted to the role played by the overshooting parameter value. The results show enhancements of about a factor 2-3 in s-process efficiency when overshooting is considered in the calculations, with overshooting parameter values in the range 0.01-0.035. The impact of these results on the p-process model based on type II supernovae is also discussed.