Charge Conjugation Violating Interactions in Supernovae and Nucleosynthesis

Core collapse supernovae are dominated by energy transport from weakly interacting neutrinos. This offers a unique opportunity for large parity and or charge conjugation violation. One charge conjugation violating term in the standard model is of order the neutrino energy over the nucleon mass and increases the $\nu_e-n$ capture cross section while decreasing that for $\bar\nu_e-p$. This reduces the ratio of neutrons to protons in the $\nu$-driven wind above a protoneutron star by approximately 20 % and may significantly hinder r-process nucleosynthesis.