  Core collapse supernovae are the leading actor in the story of the cosmic
origin of the chemical elements. Existing models, which generally assume
spherical symmetry and parameterize the explosion, have been able to broadly
replicate the observed elemental pattern. However, inclusion of neutrino
interactions produces noticeable improvement in the composition of the ejecta
when compared to observations. Neutrino interactions may also provide a
supernova source for light p-process nuclei.
