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Title: Primary fission fragment mass yields across the chart of nuclides

Abstract

In this work, 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 80 ≤ Z ≤ 130 and A ≤ 330; these yields are provided as an ASCII formatted database in the Supplemental Material. We compare our yields to known data and discussmore » general trends that emerge in low-energy fission yields across the chart of nuclides.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Joint Inst. for Nuclear Astrophysics (JINA), East Lansing, MI (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1739931
Alternate Identifier(s):
OSTI ID: 1713230
Report Number(s):
LA-UR-19-26981
Journal ID: ISSN 2469-9985; TRN: US2205396
Grant/Contract Number:  
AC02-05CH11231; 89233218CNA000001; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. C
Additional Journal Information:
Journal Volume: 101; Journal Issue: 5; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; fission; nuclear astrophysics; nuclear fragmentation; nuclear reactions

Citation Formats

Mumpower, Matthew Ryan, Jaffke, Patrick John, Verriere, Marc Hugo, and Randrup, Jorgen. Primary fission fragment mass yields across the chart of nuclides. United States: N. p., 2020. Web. doi:10.1103/physrevc.101.054607.
Mumpower, Matthew Ryan, Jaffke, Patrick John, Verriere, Marc Hugo, & Randrup, Jorgen. Primary fission fragment mass yields across the chart of nuclides. United States. https://doi.org/10.1103/physrevc.101.054607
Mumpower, Matthew Ryan, Jaffke, Patrick John, Verriere, Marc Hugo, and Randrup, Jorgen. Mon . "Primary fission fragment mass yields across the chart of nuclides". United States. https://doi.org/10.1103/physrevc.101.054607. https://www.osti.gov/servlets/purl/1739931.
@article{osti_1739931,
title = {Primary fission fragment mass yields across the chart of nuclides},
author = {Mumpower, Matthew Ryan and Jaffke, Patrick John and Verriere, Marc Hugo and Randrup, Jorgen},
abstractNote = {In this work, 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 80 ≤ Z ≤ 130 and A ≤ 330; 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.},
doi = {10.1103/physrevc.101.054607},
journal = {Physical Review. C},
number = 5,
volume = 101,
place = {United States},
year = {Mon May 18 00:00:00 EDT 2020},
month = {Mon May 18 00:00:00 EDT 2020}
}

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