Uncertainties in s-process nucleosynthesis in low-mass stars determined from Monte Carlo variations

Cescutti, G. and Hirschi, R. and Nishimura, N. and den Hartogh, J. W. and Rauscher, T. and Murphy, A. St. J. and Cristallo, S.. (2018) Uncertainties in s-process nucleosynthesis in low-mass stars determined from Monte Carlo variations. Monthly Notices of the Royal Astronomical Society, 478 (3). pp. 4101-4127.

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The main s-process taking place in low-mass stars produces about half of the elements heavier than iron. It is therefore very important to determine the importance and impact of nuclear physics uncertainties on this process. We have performed extensive nuclear reaction network calculations using individual and temperature-dependent uncertainties for reactions involving elements heavier than iron, within a Monte Carlo framework. Using this technique, we determined the uncertainty in the main s-process abundance predictions due to nuclear uncertainties linked to weak interactions and neutron captures on elements heavier than iron. We also identified the key nuclear reactions dominating these uncertainties. We found that ss-decay rate uncertainties affect only a few 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 in general small (less than 50 per cent). Three key reactions, nevertheless, stand out because they significantly affect the uncertainties of a large number of nuclides. These are Fe-56(n,gamma), Ni-64(n,gamma), and Ba-138(n,gamma). We discuss the prospect of reducing uncertainties in the key reactions identified in this study with future experiments.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Oxford University Press
Note:Publication type according to Uni Basel Research Database: Journal article -- The final publication is available at Oxford University Press, see DOI link.
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Last Modified:03 Oct 2018 09:44
Deposited On:03 Oct 2018 09:44

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