Winteler, Christian

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Winteler
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Christian
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Winteler, Christian

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Autor:in: Arcones, Almudena ×

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    Publikation
    The Role of Fission in Neutron Star Mergers and Its Impact on the r-Process Peaks
    (The American Astronomical Society, 15.07.2015) Eichler, Marius; Arcones, Almudena; Kelic, Alexandra; Korobkin, Oleg; Langanke, Karlheinz; Marketin, Tomislav; Martinez-Pinedo, Gabriel; Panov, Igor; Rauscher, Thomas; Rosswog, Stephan; Winteler, Christian; Zinner, Nikolaj; Thielemann, Friedrich-Karl [in: The Astrophysical Journal]
    Comparing observational abundance features with nucleosynthesis predictions of stellar evolution 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. We test the abundance features of r-process nucleosynthesis calculations for the dynamical ejecta of neutron star merger simulations based on three different nuclear mass models: The Finite Range Droplet Model (FRDM), the (quenched version of the) Extended Thomas Fermi Model with Strutinsky Integral (ETFSI-Q), and the Hartree-Fock-Bogoliubov (HFB) mass model. We make use of corresponding fission barrier heights and compare the impact of four different fission fragment distribution models on the final r-process abundance distribution. In particular, we explore the abundance distribution in the second r-process peak and the rare-earth sub-peak as a function of mass models and fission fragment distributions, as well as the origin of a shift in the third r-process peak position. The latter has been noticed in a number of merger nucleosynthesis predictions. We show that the 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.
    01A - Beitrag in wissenschaftlicher Zeitschrift