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Goriely S, Sida JL, Lemaître JF, et al. New fission fragment distributions and r-process origin of the rare-earth elements. Phys Rev Lett. 2013;111(24):242502doi: 10.1103/PhysRevLett.111.242502.
Goriely, S., Sida, J. L., Lemaître, J. F., Panebianco, S., Dubray, N., Hilaire, S., Bauswein, A., & Janka, H. T. (2013). New fission fragment distributions and r-process origin of the rare-earth elements. Physical review letters, 111(24), 242502. https://doi.org/10.1103/PhysRevLett.111.242502
Goriely, S, et al. "New fission fragment distributions and r-process origin of the rare-earth elements." Physical review letters vol. 111,24 (2013): 242502. doi: https://doi.org/10.1103/PhysRevLett.111.242502
Goriely S, Sida JL, Lemaître JF, Panebianco S, Dubray N, Hilaire S, Bauswein A, Janka HT. New fission fragment distributions and r-process origin of the rare-earth elements. Phys Rev Lett. 2013 Dec 13;111(24):242502. doi: 10.1103/PhysRevLett.111.242502. Epub 2013 Dec 09. PMID: 24483647.
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Phys Rev Lett. 2013 Dec 13;111(24):242502. doi: 10.1103/PhysRevLett.111.242502. Epub 2013 Dec 09.

New fission fragment distributions and r-process origin of the rare-earth elements.

Physical review letters

S Goriely, J-L Sida, J-F Lemaître, S Panebianco, N Dubray, S Hilaire, A Bauswein, H-T Janka

Affiliations

  1. Institut d'Astronomie et d'Astrophysique, CP-226, Université Libre de Bruxelles, 1050 Brussels, Belgium.
  2. C.E.A. Saclay, Irfu/Service de Physique Nucléaire, 91191 Gif-sur-Yvette, France.
  3. CEA, DAM, DIF, F-91297 Arpajon, France.
  4. Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece and Max-Planck-Institut für Astrophysik, Postfach 1317, 85741 Garching, Germany.
  5. Max-Planck-Institut für Astrophysik, Postfach 1317, 85741 Garching, Germany.

PMID: 24483647 DOI: 10.1103/PhysRevLett.111.242502

Abstract

Neutron star (NS) merger ejecta offer a viable site for the production of heavy r-process elements with nuclear mass numbers A≳140. The crucial role of fission recycling is responsible for the robustness of this site against many astrophysical uncertainties, but calculations sensitively depend on nuclear physics. In particular, the fission fragment yields determine the creation of 110≲A≲170 nuclei. Here, we apply a new scission-point model, called SPY, to derive the fission fragment distribution (FFD) of all relevant neutron-rich, fissioning nuclei. The model predicts a doubly asymmetric FFD in the abundant A≃278 mass region that is responsible for the final recycling of the fissioning material. Using ejecta conditions based on relativistic NS merger calculations, we show that this specific FFD leads to a production of the A≃165 rare-earth peak that is nicely compatible with the abundance patterns in the Sun and metal-poor stars. This new finding further strengthens the case of NS mergers as possible dominant origin of r nuclei with A≳140.

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