Primary fission fragment mass yields across the chart of nuclides

M. R. Mumpower, P. Jaffke, M. Verriere, and J. Randrup
Phys. Rev. C 101, 054607 – Published 18 May 2020
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Abstract

We have calculated a complete set of primary fission fragment mass yields, Y(A), for heavy nuclei across the chart of nuclides, including those of particular relevance to the rapid neutron capture process (r process) of nucleosynthesis. We assume that the nuclear shape dynamics are strongly damped, which allows for a description of the fission process via Brownian shape motion across nuclear potential-energy surfaces. The macroscopic energy of the potential was obtained with the Finite-Range Liquid-Drop Model (FRLDM), while the microscopic terms were extracted from the single-particle level spectra in the fissioning system by the Strutinsky procedure for the shell energies and the BCS treatment for the pairing energies. For each nucleus considered, the fission fragment mass yield, Y(A), is obtained from 50 000 to 500 000 random walks on the appropriate potential-energy surface. The full mass and charge yield, Y(Z,A), is then calculated by invoking the Wahl systematics. With this method, we have calculated a comprehensive set of fission-fragment yields from over 3800 nuclides bounded by 80Z130 and A330; these yields are provided as an ASCII formatted database in the Supplemental Material. We compare our yields to known data and discuss general trends that emerge in low-energy fission yields across the chart of nuclides.

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  • Received 6 January 2020
  • Accepted 23 April 2020

DOI:https://doi.org/10.1103/PhysRevC.101.054607

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

M. R. Mumpower*

  • Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA; Center for Theoretical Astrophysics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA; and Joint Institute for Nuclear Astrophysics - Center for the Evolution of the Elements, East Lansing, Michigan 48824, USA

P. Jaffke and M. Verriere

  • Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

J. Randrup

  • Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

  • *mumpower@lanl.gov

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Issue

Vol. 101, Iss. 5 — May 2020

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