AI Article Synopsis
- The study explores a neutrino-driven rapid neutron capture (r-process) mechanism occurring in the helium shell of a core-collapse supernova, suggesting it can function in early stars with very low metallicity (less than about 1/1000 of Solar metallicity).
- The mechanism is effective at relatively low temperatures and neutron densities, producing abundance peaks around mass numbers 130 and 195 within a time frame of 10 to 20 seconds.
- The findings highlight the importance of the neutrino emission model and neutrino oscillations, indicating that this r-process could significantly impact the interpretation of abundance data from metal-poor stars; further research is necessary to consider the effects of the supernova shock.
Article 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.
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| http://dx.doi.org/10.1103/PhysRevLett.106.201104 | DOI Listing |
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