s-processing in asymptotic giant branch stars in the light of revised neutron-capture cross sections

  • Current AGB stellar models provide an adequate description of the s-process nucleosynthesis that occurs. Nonetheless, they still suffer from many uncertainties related to the modeling of the 13C pocket formation and the adopted nuclear reaction rates. For many important s-process isotopes, a best set of neutron-capture cross sections was recently re-evaluated. Using stellar models prescribing that the 13C pocket is a by-product of magnetic-buoyancy-induced mixing phenomena, s-process calculations were carried out with this database. Significant effects are found for a few s-only and branching point isotopes, pointing out the need for improved neutron-capture cross section measurements at low energy.

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Author:Diego VescoviORCiD, René ReifarthORCiDGND
Parent Title (English):Universe
Place of publication:Basel
Document Type:Article
Date of Publication (online):2021/07/11
Date of first Publication:2021/07/11
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2021/09/06
Tag:asymptotic giant branch stars; chemically peculiar stars; circumstellar dust; nuclear reaction cross sections; nucleosynthesis; s-process; stellar abundances
Issue:7, art. 239
Page Number:10
First Page:1
Last Page:10
This work was partially supported by the German-Israeli Foundation (GIF No. I-1500- 303.7/2019).
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften
5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - Namensnennung 4.0