The synthesis of the light Mo and Ru isotopes: how now no need for an exotic solution?

The most detailed calculations of the p-process call for its development in the O/Ne layers of Type II supernovae. In spite of their overall success i n reproducing the solar system content of p-nuclides. they suggest a signif icant underproduction of the light Mo and Ru isotopes. On grounds of a mode l for the explosion of a 25 M. star with solar metallicity, we demonstrate that this failure might just be related to the uncertainties left in the ra te of the Ne-22(alpha, n) Mg-25 neutron producing reaction. The latter inde ed have a direct impact on the distribution of the s-process seeds for the p-process.