The impact of the 18F(α,p)21Ne reaction on fluorine production in AGB stars

Amanda I. Karakas, H. Y. Lee, Maria Lugaro, J. Görres, M. Wiescher

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review


The recent experimental evaluation of the 18F(α,p) 21Ne reaction rate, when considering its associated uncertainties, presented significant differences compared to the theoretical Hauser-Feshbach rate. This was most apparent at the low temperatures relevant for He-shell burning in asymptotic giant branch (AGB) stars. Investigations into the effect on AGB nucleosynthesis revealed that the upper limit resulted in an enhanced production of 19F and 21Ne in carbon-rich AGB models, but the recommended and lower limits presented no differences from using the theoretical rate. This was the case for models spanning a range in metallicity from solar to [Fe/H] ∼ -2.3. The results of this study are relevant for observations of F and C-enriched AGB stars in the Galaxy, and to the Ne composition of mainstream silicon carbide grains, that supposedly formed in the outflows of cool, carbon-rich giant stars. We discuss the mechanism that produces the extra F and summarize our main findings.

Original languageEnglish
Title of host publicationProceedings of Science
Subtitle of host publication10th Symposium on Nuclei in the Cosmos
PublisherSissa Medialab, SRL
Number of pages5
Publication statusPublished - 1 Dec 2008
Externally publishedYes
EventInternational Symposium on Nuclei in the Cosmos 2008 - Mackinac Island, United States of America
Duration: 27 Jul 20081 Aug 2008
Conference number: 10th

Publication series

NameProceedings of Science
PublisherSissa Medialab, SRL
ISSN (Print)1824-8039


ConferenceInternational Symposium on Nuclei in the Cosmos 2008
Abbreviated titleNIC 2008
Country/TerritoryUnited States of America
CityMackinac Island
Internet address

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