Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session M10: Nuclear Theory III
2:00 PM–4:15 PM,
Friday, December 1, 2023
Hilton Waikoloa Village
Room: Kohala 3
Chair: Amy Lovell, Los Alamos Natl Lab
Abstract: M10.00002 : Uncertainty-quantified optical potentials for the fission fragment region*
2:15 PM–2:30 PM
Presenter:
Kyle Beyer
(University of Michigan)
Authors:
Kyle Beyer
(University of Michigan)
Amy E Lovell
(Los Alamos Natl Lab)
Cole D Pruitt
(Lawrence Livermore National Lab)
Brian Kiedrowski
(University of Michigan, Department of Nuclear Engineering and Radiological Sciences)
Fission fragments present a messy but unique source of experimental data about the many-body physics of neutron-rich nuclei, which has implications in astrophysical nucleosynthesis, energy, and nuclear non-proliferation applications. Currently, phenomenological optical potentials, the nucleon-nucleus interactions used in nuclear reaction models, are calibrated to direct reaction experiments on stable targets, and extrapolated away from stability for applications involving neutron-rich nuclei - including in fission event generators that use Hauser-Feshbach fragment de-excitation, such as CGMF, FIFRELIN, GEF, and Meitner. The goal of this work is to outline the inclusion of compound-nuclear observables - with fission as a case study - into the calibration of these optical potentials, using a Monte Carlo Hauser-Feshbach approach. To make this model calibration computationally tractable, while preserving event-by-event correlations in observables, an intrusive model order reduction technique for calculating transition matrices is constructed using the reduced basis method, with preliminary results showing a speedup on the order of 10^3. Initial results indicate the presence of hitherto untapped constrains on optical potentials in neutron-fragment correlated fission experiments, especially neutron energy spectra as a function of fragment mass and TKE. The overarching goal is to construct the world's first uncertainty-quantified optical potential for the fission fragment region that is simultaneously calibrated to direct reactions on isotopes in this region, as well as experimental fission observables.
*This work was funded by the Consortium for Monitoring, Technology, and Verification under Department of Energy National Nuclear Security Administration award number DE-NA0003920, performed under the auspices of the U.S. Department of Energy by Los Alamos National Laboratory under Contract 89233218CNA000001 and under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
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