  Matter-neutrino resonances (MNR) can occur in environments where the flux of
electron antineutrinos is greater than the flux of electron neutrinos. These
resonances may result in dramatic neutrino flavor transformation. Compact
object merger disks are an example of an environment where electron
antineutrinos outnumber neutrinos. We study MNR resonances in several such disk
configurations and find two qualitatively different types of matter-neutrino
resonances: a standard MNR and a symmetric MNR. We examine the transformation
that occurs in each type of resonance and explore the consequences for
nucleosynthesis.
