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Probing the Production of Actinides under Different r-process Conditions

Eichler, M. and Sayar, W. and Arcones, A. and Rauscher, T.. (2019) Probing the Production of Actinides under Different r-process Conditions. ASTROPHYSICAL JOURNAL, 879 (1). ARTN47.

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Official URL: https://edoc.unibas.ch/71992/

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Abstract

Several extremely metal-poor stars are known to have an enhanced thorium abundance. These actinide-boost stars have likely inherited material from an r-process that operated under different conditions than the r-process that is reflected in most other metal-poor stars with no actinide enhancement. In this article, we explore the sensitivity of actinide production in r-process calculations to the hydrodynamical conditions as well as the nuclear physics. We find that the initial electron fraction Y-e is the most important factor determining the actinide yields and that the abundance ratios between long-lived actinides and lanthanides like europium can vary for different conditions in our calculations. In our setup, conditions with high entropies systematically lead to lower actinide abundances relative to other r-process elements. Furthermore, actinide-enhanced ejecta can also be distinguished from the "regular" composition in other ways, most notably in the second r-process peak abundances.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:IOP PUBLISHING LTD
ISSN:0004-637X
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:08 Oct 2019 09:35
Deposited On:08 Oct 2019 09:35

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