  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 enough for the r-process, lighter heavy elements like Sr, Y, and Zr can
be produced. However, it is still not clear whether the conditions in the wind
are slightly neutron rich or proton rich. Here we investigate the
nucleosynthesis in neutrino-driven winds for both these conditions and
systematically explore the impact of wind parameters on abundances. Our results
show the difficulty of obtaining a robust abundance pattern in neutron-rich
winds where also an over production of Sr, Y, and Zr is likely. In proton-rich
conditions, the abundances smoothly change when varying wind parameters.
Constraints for wind parameters and neutrino energies and luminosities will
soon become available by combining nucleosynthesis studies, like the one
presented here, with new and future experimental data and observations.
