Skyrme–Hartree–Fock–Bogoliubov mass models on a 3D mesh: IIb. Fission properties of BSkG2

Ryssens, Wouter; Scamps, Guillaume; Goriely, Stephane; Bender, Michael

doi:10.1140/epja/s10050-023-01002-x

Title: Skyrme–Hartree–Fock–Bogoliubov mass models on a 3D mesh: IIb. Fission properties of BSkG2

Journal Article · Thu May 04 00:00:00 EDT 2023 · European Physical Journal. A, Hadrons and Nuclei (Online)

DOI:https://doi.org/10.1140/epja/s10050-023-01002-x· OSTI ID:2202346

Ryssens, Wouter ^[1]; Scamps, Guillaume ^[2]; Goriely, Stephane ^[1]; Bender, Michael ^[3]

Université Libre de Bruxelles, Brussels (Belgium)
Université Libre de Bruxelles, Brussels (Belgium); University of Washington, Seattle, WA (United States)
Université de Lyon, Villeurbanne (France)

Large-scale models of nuclear structure are currently the only way to provide consistent datasets for the many properties of thousands of exotic nuclei that are required by nucleosynthesis simulations. In [W. Ryssens et al., Eur. Phys. J. A 58, 246 (2022)], we recently presented the new BSkG2 model based on an energy density functional of the Skyrme type. Relying on a flexible three-dimensional coordinate representation of the nucleus, the model takes into account both triaxial deformation and time-reversal symmetry breaking. BSkG2 achieves a state-of-the-art global description of nuclear ground state (g.s.) properties and reproduces in particular the known masses with a root-mean-square (rms) deviation of 678 keV. Moving beyond g.s. properties, the model also reproduces all empirical values for the primary and secondary barriers as well as isomer excitation energies of actinide nuclei with rms deviations below 500 keV, i.e. with unprecedented accuracy. Here we discuss in detail the extension of our framework to the calculation of the fission barriers of 45 actinide nuclei, including odd-mass and odd-odd systems. We focus in particular on the impact of symmetry breaking which is key to the accuracy of the model: we allow systematically for axial, reflection and time-reversal symmetry breaking. The effect of the latter on the fission properties of odd-mass and odd-odd nuclei is small, but we find that allowing for shapes with triaxial or octupole deformation, as well as shapes with both, is crucial to achieving this accuracy. Here, the numerical accuracy of our coordinate space approach, the variety of nuclear configurations explored and the simultaneous successful description of fission properties and known masses makes BSkG2 the tool of choice for the large-scale study of nuclear structure.

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Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-97ER41014

OSTI ID:: 2202346

Journal Information:: European Physical Journal. A, Hadrons and Nuclei (Online), Vol. 59, Issue 5; ISSN 1434-601X

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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