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The role of fission on neutron star mergers and its impact on the r-process peaks

Eichler, M. and Arcones, A. and Kelic, A. and Korobkin, O. and Langanke, K. and Marketin, T. and Martinez-Pinedo, G. and Panov, I. and Rauscher, T. and Rosswog, S. and Winteler, C. and Zinner, N. T. and Thielemann, F.-K.. (2016) The role of fission on neutron star mergers and its impact on the r-process peaks. In: AIP Conference Proceedings, 1743. 040004.

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Abstract

The comparison between observational abundance features and those obtained from nucleosynthesis predictions of stellar evolution and/or explosion simulations can scrutinize two aspects: (a) the conditions in the astrophysical production site and (b) the quality of the nuclear physics input utilized. Here we test the abundance features of r-process nucleosynthesis calculations using four different fission fragment distribution models. Furthermore, we explore the origin of a shift in the third r-process peak position in comparison with the solar r-process abundances which has been noticed in a number of merger nucleosynthesis predictions. We show that this shift occurs during the r-process freeze-out when neutron captures and β-decays compete and an (n,γ)-(γ,n) equilibrium is not maintained anymore. During this phase neutrons originate mainly from fission of material above A = 240. We also investigate the role of β-decay half-lives from recent theoretical advances, which lead either to a smaller amount of fissioning nuclei during freeze-out or a faster (and thus earlier) release of fission neutrons, which can (partially) prevent this shift and has an impact on the second and rare-earth peak as well.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Thielemann, Friedrich-Karl and Eichler, Marius and Rauscher, Thomas
Item Type:Conference or Workshop Item
Conference or workshop item Subtype:Conference Paper
Publisher:AIP Publishing
ISSN:0094-243X
e-ISSN:1551-7616
Note:Publication type according to Uni Basel Research Database: Conference paper
Language:English
Identification Number:
Last Modified:11 Oct 2017 12:29
Deposited On:15 Mar 2017 12:47

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