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

N. Nishimura, R. Hirschi, T. Rauscher

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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 β-decay.
Original languageEnglish
Article number012051
Number of pages4
JournalJournal of Physics: Conference Series
Volume940
Issue number1
DOIs
Publication statusPublished - 31 Jan 2018
EventNuclear Physics in Astrophysics Conference (NPA VII) - The Royal York Hotel, York, United Kingdom
Duration: 18 May 201522 May 2015
http://www.nuclearalliance.uk/nuclear-physics-in-astrophysics-conference-npa-vii/

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