Potential energy surfaces and fission fragment mass yields of even-even superheavy nuclei

Potential energy surfaces and fission barriers of superheavy nuclei are analyzed in a macroscopic-microscopic model.The Lublin-Strasbourg Drop(LSD)model is used to obtain the macroscopic part of the energy,whereas the shell and pairing energy corrections are evaluated using the Yukawa-folded potential;a standard flooding technique is utilized to determine barrier heights.A Fourier shape parametrization containing only three deformation parameters is shown to effectively reproduce the nuclear shapes of nuclei approaching fission.In addition,a non-axial degree of freedom is taken into account to better describe the structure of nuclei around the ground state and in the saddle region.In addition to the symmetric fission valley,a new highly asymmetric fission mode is predicted in most superheavy nuclei.The fission fragment mass distributions of the considered nuclei are obtained by solving 3D Langevin equations.

Fission fragment mass yields of Th to Rf even-even nuclei

Fission properties of the actinide nuclei are deduced from theoretical analysis.We investigate potential energy surfaces and fission barriers and predict the fission fragment mass yields of actinide isotopes.The results are compared with experimental data where available.The calculations were performed in the macroscopic-microscopic approximation With the Lublin-Strasbourg Drop(LSD)for the macroscopic part,and the microscopic energy corrections were evaluated in the Yukawa-folded potential.The Fourier nuclear shape parametrization is used to describe the nuclear shape,including the non-axial degree of freedom.The fission fragment mass yields of the nuclei considered are evaluated within a 3D colletive model using the Borm-Oppenheimer approximation.