https://doi.org/10.1140/epja/s10050-021-00642-1
Regular Article - Theoretical Physics
Skyrme-Hartree-Fock-Bogoliubov mass models on a 3D mesh: effect of triaxial shape
1
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, Campus de la Plaine CP 226, 1050, Brussels, Belgium
2
Université de Lyon, Université Claude Bernard Lyon 1, CNRS, IP2I Lyon / IN2P3, UMR 5822, 69622, Villeurbanne, France
3
Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, 06520, New Haven, CT, USA
Received:
7
September
2021
Accepted:
26
November
2021
Published online:
16
December
2021
The modelling of nuclear reactions and radioactive decays in astrophysical or earth-based conditions requires detailed knowledge of the masses of essentially all nuclei. Microscopic mass models based on nuclear energy density functionals (EDFs) can be descriptive and used to provide this information. The concept of intrinsic symmetry breaking is central to the predictive power of EDF approaches, yet is generally not exploited to the utmost by mass models because of the computational demands of adjusting up to about two dozen parameters to thousands of nuclear masses. We report on a first step to bridge the gap between what is presently feasible for studies of individual nuclei and large-scale models: we present a new Skyrme-EDF-based model that was adjusted using a three-dimensional coordinate-space representation, for the first time allowing for both axial and triaxial deformations during the adjustment process. To compensate for the substantial increase in computational cost brought by the latter, we have employed a committee of multilayer neural networks to model the objective function in parameter space and guide us towards the overall best fit. The resulting mass model BSkG1 is computed with the EDF model independently of the neural network. It yields a root mean square (rms) deviation on the 2457 known masses of 741 keV and an rms deviation on the 884 measured charge radii of 0.024 fm.
The original online version of this article was revised: The Supplementary Information was missing.
Supplementary Information The online version contains supplementary material available at https://doi.org/10.1140/epja/s10050-021-00642-1.
Copyright comment corrected publication 2022
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021. corrected publication 2022
