Advances in s-process models

M. Lugaro1 and F. Herwig2, 3

1Department of Mathematics, Monash University, Clayton, Victoria, Australia
2Universität Potsdam, Institut für Physik, Astrophysik
3Dept. of Physics and Astronomy, University of Victoria, Canada

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 13C source is also studied and we find that a linear relationship exists between the initial 12C in the intershell and the maximum number of neutrons produced.

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