  An effective Fourier nuclear shape parametrization which describes well the
most relevant degrees of freedom on the way to fission is used to construct a
3D collective model. The potential energy surface is evaluated within the
macroscopic-microscopic approach based on the Lublin-Strasbourg Drop (LSD)
macroscopic energy and Yukawa-folded single particle potential. A
phenomenological inertia parameter is used to describe the kinetic properties
of the fissioning system. The fission fragment mass yields are obtained by
using an approximate solution of the underlying Hamiltonian. The predicted mass
fragmentations for even-even Pt to Ra isotopes are compared with available
experimental data. Their main characteristics are well reproduced when the neck
rupture probability dependent on the neck radius is introduced.
