  A rapidly converging 4-dimensional Fourier shape parametrization is used to
model the fission process of heavy nuclei. Potential energy landscapes are
computed within the macroscopic-microscopic approach, on top of which the
multi-dimensional Langevin equation is solved to describe the fission dynamics.
Charge equilibration at scission and de-excitation by neutron evaporation of
the primary fragments after scission is investigated. The model describes
various observables, including fission-fragment mass, charge, and kinetic
energy yields, as well as post-scission neutron multiplicities and, most
importantly, their correlations, which are crucial to unravel the complexity of
the fission process. The parameters of the dynamical model were tuned to
reproduce experimental data obtained from thermal neutron-induced fission of
$^{235}$U, which allows us to discuss the transition from asymmetric to
symmetric fission along the Fm isotopic chain.

Nuclear Theory;Nuclear Experiment