The s-Process Nucleosynthesis in Low Mass Stars: Impact of the Uncertainties in the Nuclear Physics Determined by Monte Carlo Variations
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We investigated the impact of uncertainties in neutron-capture and weak reactions (on heavy elements) on the s-process nucleosynthesis in low-mass stars using a Monte-Carlo based approach. We performed extensive nuclear reaction network calculations that include newly evaluated temperature-dependent upper and lower limits for the individual reaction rates. Our sophisticated approach is able to evaluate the reactions that impact more significantly the final abundances. We found that \(\beta \)-decay rate uncertainties affect typically nuclides near s-process branchings, whereas most of the uncertainty in the final abundances is caused by uncertainties in neutron capture rates, either directly producing or destroying the nuclide of interest. Combined total nuclear uncertainties due to reactions on heavy elements are approximately 50%.
GC acknowledges financial support from the European Union Horizon 2020 research and innovation programme under the Marie Skodowska-Curie grant agreement no. 664931. This work has been partially supported by the European Research Council (EU-FP7-ERC-2012-St Grant 306901), the EU COST Action CA16117 (ChETEC), the UK STFC (ST/M000958/1), and MEXT Japan (Priority Issue on Post-K computer: Elucidation of the Fundamental Laws and Evolution of the Universe).
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