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We consider hot accretion disk outflows from black hole - neutron starmergers in the context of the nucleosynthesis they produce. We begin with athree dimensional numerical model of a black hole - neutron star merger andcalculate the neutrino and antineutrino fluxes emitted from the resultingaccretion disk. We then follow the element synthesis in material outflowing thedisk along parameterized trajectories. We find that at least a weak r-processis produced, and in some cases a main r-process as well. The neutron-richconditions required for this production of r-process nuclei stem directly fromthe interactions of the neutrinos emitted by the disk with the free neutronsand protons in the outflow.

r-Process Nucleosynthesis in Hot Accretion Disk Flows from Black Hole - Neutron Star Mergers