title: Long, cold, early r process? Neutrino-induced nucleosynthesis in He shells revisited.
abstract: 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 Z ≲ 10⁻³ Z(⊙), at relatively low temperatures and neutron densities, producing A ~ 130 and 195 abundance peaks over ~10-20 s. 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.
authors.affiliation: School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA. banerjee@physics.umn.edu
authors.forename: Projjwal
authors.initials: P
authors.lastname: Banerjee
authors.forename: W C
authors.initials: WC
authors.lastname: Haxton
authors.forename: Yong-Zhong
authors.initials: YZ
authors.lastname: Qian