University of Hertfordshire

By the same authors

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • M. Eichler
  • A. Arcones
  • A. Kelic
  • O. Korobkin
  • K. Langanke
  • T. Marketin
  • G. Martinez-Pinedo
  • I. Panov
  • T. Rauscher
  • S. Rosswog
  • C. Winteler
  • N. T. Zinner
  • F. K. Thielemann
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Original languageEnglish
Title of host publicationCETUP* 2015 – Workshop on Dark Matter, Neutrino Physics and Astrophysics PPC 2015 – IXth International Conference on Interconnections between Particle Physics and Cosmology
EditorsBarbara Szczerbinska, Rouzbeh Allahverdi, Kaladi Babu, Baha Balantekin, Bhaskar Dutta, Teruki Kamon, Jason Kumar, Farinaldo Queiroz, Louis Strigari, Rebecca Surman
Place of PublicationSouth Dakota, USA
PublisherAmerican Institute of Physics Inc.
Volume1743
ISBN (Print)9780735414006
DOIs
Publication statusPublished - 21 Jun 2016
Event5th Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2015 and 9th International Conference on Interconnections between Particle Physics and Cosmology, PPC 2015 - Lead/Deadwood, United States
Duration: 15 Jun 201517 Jul 2015

Conference

Conference5th Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2015 and 9th International Conference on Interconnections between Particle Physics and Cosmology, PPC 2015
CountryUnited States
CityLead/Deadwood
Period15/06/1517/07/15

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.

Notes

M. Eichler, A. Arcones, A. Kelic, O. Korobkin, K. Langanke, T. Marketin, G. Martinez-Pinedo, I. Panov, T. Rauscher, S. Rosswog, C. Winteler, N. T. Zinner, and F. K. Thielemann, ‘The role of fission on neutron star mergers and its impact on the r-process peaks’, in proceedings CETUP* 2015 – Workshop on Dark Matter, Neutrino Physics and Astrophysics PPC 2015 – IXth International Conference on Interconnections between Particle Physics and Cosmology. Deadwood, South Dakota, USA. 15-17 July 2015. Barbara Szczerbinska, Rouzbeh Allahverdi, Kaladi Babu, Baha Balantekin, Bhaskar Dutta, Teruki Kamon, Jason Kumar, Farinaldo Queiroz, Louis Strigari, and Rebecca Surman eds., ISBN 9780735414006. Available online at doi: http://dx.doi.org/10.1063/1.4953296. Published by AIP Publishing.

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