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Probing the Production of Actinides under Different r-process Conditions

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Probing the Production of Actinides under Different r-process Conditions. / Eichler, M.; Sayar, W.; Arcones, A.; Rauscher, T.

In: Astrophysical Journal, Vol. 879, No. 1, 47, 01.07.2019.

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@article{b08871ee737e48449890c3d7cbe78cbc,
title = "Probing the Production of Actinides under Different r-process Conditions",
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.",
keywords = "abundances, nuclear reactions, nucleosynthesis, stars: Abundances",
author = "M. Eichler and W. Sayar and A. Arcones and T. Rauscher",
year = "2019",
month = "7",
day = "1",
doi = "10.3847/1538-4357/ab24cf",
language = "English",
volume = "879",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

RIS

TY - JOUR

T1 - Probing the Production of Actinides under Different r-process Conditions

AU - Eichler, M.

AU - Sayar, W.

AU - Arcones, A.

AU - Rauscher, T.

PY - 2019/7/1

Y1 - 2019/7/1

N2 - 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.

AB - 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.

KW - abundances

KW - nuclear reactions

KW - nucleosynthesis

KW - stars: Abundances

UR - http://www.scopus.com/inward/record.url?scp=85069505178&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/ab24cf

DO - 10.3847/1538-4357/ab24cf

M3 - Article

VL - 879

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 47

ER -