Sensitivity to neutron captures and ß -decays of the enhanced s-process in rotating massive stars at low metallicities

Hirschi

Abstract

The s-process in massive stars, producing nuclei up to A ˜ 90, has a different behaviour at low metallicity if stellar rotation is significant. This enhanced s-process is distinct from the s-process in massive stars around solar metallicity, and details of the nucleosynthesis are poorly known. We investigated nuclear physics uncertainties in the enhanced s-process in metalpoor stars within a Monte-Carlo framework. We applied temperature-dependent uncertainties of reaction rates, distinguishing contributions from the ground state and from excited states. We found that the final abundance of several isotopes shows uncertainties larger than a factor of 2, mostly due to the neutron capture uncertainties. A few nuclei around branching points are affected by uncertainties in the ß -decay.

Citation

Hirschi. (2018). Sensitivity to neutron captures and ß -decays of the enhanced s-process in rotating massive stars at low metallicities. Journal of Physics: Conference Series, 12051. https://doi.org/10.1088/1742-6596/940/1/012051

• Acceptance Date: Jan 31, 2018
• Publication Date: Jan 31, 2018
• Journal: Journal of Physics: Conference Series
• Print ISSN: 1742-6588
• Publisher: IOP Publishing
• Pages: 12051
• DOI: https://doi.org/10.1088/1742-6596/940/1/012051
• Keywords: physics, astronomy
• Publisher URL: http://doi.org/10.1088/1742-6596/940/1/012051