Neutrino-Induced Production of Beryllium in Core-Collapse Supernovae

We present two new mechanisms for neutrino-induced production of $^9$Be in core-collapse supernovae. The first mechanism operates in the shocked material close to the core of low-mass progenitors of $\sim 8 M_\odot$. The second mechanism operates in He shells of progenitors of $\sim 11-15 M_\odot$. While the first mechanism is independent of metallicity, the second mechanism operates only at metallicities $\la 10^{-3}$ the solar value. We explore the sensitivity of both mechanisms to neutrino emission spectra, flavor oscillations, and the explosion energy. We find that the observed Be abundances at low metallicities can be accounted for by these two mechanisms and discuss similar mechanisms that may produce Be at higher metallicities.