University of Hertfordshire

By the same authors

Quantification of nuclear uncertainties in nucleosynthesis of elements beyond Iron

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Documents

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Original languageEnglish
Title of host publicationProceedings of Science
EditorsZ Elekes, Z Fulop
PublisherProceedings of Science (PoS)
Volume7
Publication statusPublished - 11 Jul 2015
Event13th Nuclei in the Cosmos: NIC 2014 - Debrecen, Hungary
Duration: 7 Jul 201411 Jul 2014

Conference

Conference13th Nuclei in the Cosmos
Country/TerritoryHungary
CityDebrecen
Period7/07/1411/07/14

Abstract

Nucleosynthesis beyond Fe poses additional challenges not encountered when studying astrophysical processes involving light nuclei. Generally higher temperatures and nuclear level densities lead to stronger contributions of transitions on excited target states. This may prevent cross section measurements to determine stellar reaction rates and theory contributions remain important. Furthermore, measurements often are not feasible in the astrophysically relevant energy range. Sensitivity analysis allows not only to determine the contributing nuclear properties but also is a handy tool for experimentalists to interpret the impact of their data on predicted cross sections and rates. It can also speed up future input variation studies of nucleosynthesis by simplifying an intermediate step in the full calculation sequence. Large-scale predictions of sensitivities and ground-state contributions to the stellar rates are presented, allowing an estimate of how well rates can be directly constrained by experiment. The reactions 185W(n,γ) and 186W(γ,n) are discussed as application examples. Studies of uncertainties in abundances predicted in nucleosynthesis simulations rely on the knowledge of reaction rate errors. An improved treatment of uncertainty analysis is presented as well as a recipe for combining experimental data and theory to arrive at a new reaction rate and its uncertainty. As an example, it is applied to neutron capture rates for the s-process, leading to larger uncertainties than previously assumed.

Notes

Thomas Rauscher, 'Quantification of nuclear uncertainties in nucleosynthesis of elements beyond Iron', in Proceedings of Science, Vol. 7 (7) July 2015. Paper presented at the XIII Nuclei in the Cosmos Conference, 7-11 July 2014, Debrecen, Hungary. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

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