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Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 13
2015 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 808, no 1, 30Article in journal (Refereed) Published
Abstract [en]

Comparing observational abundance features with nucleosynthesis predictions of stellar evolution or explosion simulations, we 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, the (quenched version of the) Extended Thomas Fermi Model with Strutinsky Integral, and the Hartree-Fock-Bogoliubov 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during the r-process freeze-out when neutron captures and beta-decays compete and an (n,gamma)-(gamma,n) equilibrium is no longer maintained. During this phase neutrons originate mainly from fission of material above A = 240. We also investigate the role of beta-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.

Place, publisher, year, edition, pages
2015. Vol. 808, no 1, 30
Keyword [en]
nuclear reactions, nucleosynthesis, abundances, stars: neutron
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-120091DOI: 10.1088/0004-637X/808/1/30ISI: 000359062500030OAI: diva2:851313
Available from: 2015-09-04 Created: 2015-09-01 Last updated: 2015-09-04Bibliographically approved

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Korobkin, OlegRosswog, Stephan
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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