Calculations of fission rates for r-process nucleosynthesis

Details Calculations of fission rates for r-process nucleosynthesis Calculations of fission rates for r-process nucleosynthesis

2004-12-29

arxiv.org/abs/astro-ph/0412654v1

Nucl.Phys. A747 (2005) 633-654

Astronomy and Astrophysics

Astrophysics

28 pages, 10 figures, to be published in Nuclear Physics A

Scientific paper

10.1016/j.nuclphysa.2004.09.115

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.

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