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 F11: Minisymposium: Accessing the Third r-Process Peak: Nuclear Structure and Fission Studies
9:00 AM–11:45 AM,
Thursday, November 30, 2023
Hilton Waikoloa Village
Room: Kings 1
Chair: Maxime Brodeur, University of Notre Dame
Abstract: F11.00002 : An application of shell model to low-energy induced fission
9:30 AM–9:45 AM
Presenter:
Kouichi Hagino
Authors:
Kouichi Hagino
George F Bertsch
(University of Washington)
nuclear fission microscopically starting from nucleonic degrees of freedom.
Such microscopic description is important particularly for low-energy
induced fission, in which the excitation energy of the compound nucleus
is relatively low so that an application of the statistical model may be
questionable. This includes fission in r-process nucleosynthesis as well
as barrier-top fission. Here we shall discuss our recent attempts with
a shell model, for which many-body configurations are constructed based on
a constrained density functional theory for shapes along a fission path.
We specifically present our calculations with the Skyrme functional for a
neutron induced fission of 235U at barrier-top energies. In this exploratory
study, the configuration space is restricted only to neutron seniority-zero
configurations with a relatively small energy cutoff. We find that the
calculated fission-to-capture branching ratio is quite insensitive to the
fission decay widths of the pre-scission configurations, as is assumed
in transition-state theory. However, the probability flux at the barrier
appears spread out over many configurations rather than a few transition-state
channel.
Modeling barrier-top fission dynamics in a discrete-basis formalism
G.F. Bertsch and K. Hagino,
Phys. Rev. C107 (2023) 044615
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