Long, cold, early r process? Neutrino-induced nucleosynthesis in he shells revisited

We revisit a ν-driven r-process mechanism in the He shell of a core-collapse supernova, finding that it could succeed in early stars of metallicity Z10 ^-3Z, at relatively low temperatures and neutron densities, producing A 130 and 195 abundance peaks over ∼10-20s. The mechanism is sensitive to the ν emission model and to ν oscillations. We discuss the implications of an r process that could alter interpretations of abundance data from metal-poor stars, and point out the need for further calculations that include effects of the supernova shock.