Calculations of fission rates for r-process nucleosynthesis

I. Panov, E. Kolbe, B. Pfeiffer, T. Rauscher, K.L. Kratz, Friedrich-Karl Thielemann

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85 Citations (Scopus)
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Abstract

Fission plays an important role in the r-process which is responsible; not only for the yields of transuranium isotopes, but may have a strong influence on the formation of the majority of heavy nuclei due to fission recycling. We present calculations of beta-delayed and neutron-induced fission rates, taking into account different fission barriers predictions and mass formulae. It is shown that an increase of fission barriers results naturally in a reduction of fission rates, but that nevertheless fission leads to the termination of the r-process. Furthermore, it is discussed that the probability of triple fission could be high for A > 260 and have an effect on the formation of the abundances of heavy nuclei. Fission after beta-delayed neutron emission is discussed as well as different aspects of the influence of fission upon r-process calculations

Original languageEnglish
Pages (from-to)633-654
Number of pages22
JournalNuclear Physics A
Volume747
Issue number2-4
DOIs
Publication statusPublished - 24 Jan 2005

Keywords

  • STRENGTH FUNCTIONS
  • CHRONOMETERS
  • fission rates
  • NEUTRON-STAR MERGERS
  • TERNARY FISSION
  • APPROXIMATION
  • r-process
  • MODEL
  • BETA-DELAYED FISSION
  • STABILITY
  • NUCLEAR-MASS FORMULA
  • fission
  • EMISSION

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