Research of Fission Fragment Mass Distribution for ²⁸Si+¹⁷⁴Yb at Energies near the Coulomb Barrier

In order to study the fission mechanism, the mass distributions and mass-angle distributions of the fission fragments for ²⁸Si+¹⁷⁴Yb were measured near the Coulomb barrier. The mass-angle correlations do not indicate any possible quasi-fission events in this bombarding energy range. The mass distributions were fitted by the single Gaussian distribution and then the mass widths were extracted. At above-barrier energies, the mass widths were found to increase with the energy. However, the mass widths show slight increase with decreasing energy below the barrier. Additionally, the mass widths can not be reproduced in the framework of the saddle statistic model with the given parameter, so further study is still needed.