News from the p-process: is the s-process a troublemaker?

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 in reproducing the solar system content of p-nuclides, they suggest a significant underproduction of the light Mo and Ru isotopes. On grounds of a model 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 rate of the 22Ne (α, n) 25Mg neutron producing reaction. The latter indeed has a direct impact on the distribution of the s-process seeds for the p-process.