  The wind driven by the intense neutrino emission from a protoneutron star
(PNS) is an important site for producing nuclei heavier than the Fe group.
Because of certain features in the neutrino angular distributions, the
so-called fast flavor oscillations may occur very close to the PNS surface,
effectively resetting the neutrino luminosities and energy spectra that drive
the wind.
  Using the unoscillated neutrino emission characteristics from two
core-collapse supernova simulations representative of relevant progenitors at
the lower and higher mass end, we study the potential effects of fast flavor
oscillations on neutrino-driven winds and their nucleosynthesis.
  We find that such oscillations can increase the total mass loss by factors up
to ~ 1.5-1.7 and lead to significantly more proton-rich conditions. The latter
effect can greatly enhance the production of 64Zn and the so-called light
p-nuclei 74Se, 78Kr, and 84Sr. Implications for abundances in metal-poor stars,
Galactic chemical evolution in general, and isotopic anomalies in meteorites
are discussed.
