Orateur
Description
Modeling fission properties, such as barriers and rates, is highly challenging. The most advanced methods, based on energy density functionals (EDFs), rely on a limited set of collective coordinates to describe the evolution of a fissioning nucleus from its ground state to scission. Commonly used degrees of freedom include the quadrupole moment, which describes axially symmetric ellipsoids, and the octupole moment, which characterizes pear shapes. Mapping the nuclear energy landscape as a function of these shapes allows for the calculation of fission pathways and reaction rates. However, this requires exploring thousands of nuclear shapes, making large-scale computations prohibitively expensive [3]. To address this challenge, we employ the MOCCa nuclear structure code, which leverages the speed and numerical accuracy of a coordinate space representation. Combined with the BSkG3 model fitted to all known empirical fission barriers and isomer excitation energies this framework allows us to incorporate both triaxial and octupole deformations into fission paths while maintaining computational efficiency. This study is the first to systematically explore the fission properties of the heaviest neutron-rich isotopes with microscopic models simultaneously accounting for: (1) axial and triaxial quadrupole moments along with the axial octupole moment, (2) all nuclei, including odd and odd-odd cases, and (3) fission paths determined via the least action principle. To demonstrate its predictive power, we will compare BSkG3-based results with available experimental data, such as spontaneous fission half-lives or fission fragment yields.
