Constraints on Neutrino Oscillations and Spectra from Neutrino Nucleosynthesis

We have studied the sensitivity to variations in the triple alpha and $^{12}$C($\alpha, \gamma$)$^{16}$O reaction rates, of the yield of the neutrino process isotopes $^7$Li, $^{11}$B, $^{19}$F, $^{138}$La, and $^{180}$Ta in core collapse supernovae. Compared to solar abundances, less than 15\% of $^7$Li, about 25-80\% of $^{19}$F, and about half of $^{138}$La is produced in these stars. Over a range of $\pm 2\sigma$ for each helium-burning rate, $^{11}$B is overproduced and the yield varies by an amount larger than the variation caused by the effects of neutrino oscillations. The total $^{11}$B yield, however, may eventually provide constraints on supernova neutrino spectra.