Nucleosynthesis of elements between Sr and Ag in neutron- and proton-rich neutrino-driven winds

Neutrino-driven winds that follow core collapse supernovae were thought to be the site where half of the heavy elements are produced by the r-process. Although recent hydrodynamic simulations show that the conditions in the wind are not neutron-rich enough for the r-process (see e.g. [7]), lighter heavy elements like Sr, Y and Zr can be produced [1, 8, 4]. However, it is still not clear whether the conditions in the wind are slighly neutron-rich or protonrich. In Ref. [1], we have studied the formation of lighter heavy elements in slighly neutron-rich (Ye < 0.5) and proton-rich (Ye > 0.5) winds. We have systematically explored the impact of the wind parameters (see e.g. [9, 6]): entropy, expansion time scale and electron fraction Ye. The wind parameters have been varied within typical conditions values found in wind simulations [2, 3].