Effects of multichance fission on mass yields at high energies

The mass distributions of fragment for neutron-induced ^235, 238U, ^237Np, and ^239Pu fission were studied using the improved scission point model by considering the octupole deformation of the fragments over a wide range of incident neutron energies (E₍=10-500. 28em{0ex}MeV). The multichance fission mechanism ensures that the mass distributions remain highly asymmetric even at high energy. We also investigated the role of octupole deformation of fragments in the multichance fission mechanism. The results obtained using the improved scission point model accurately replicated the experimental data. This model is expected to further our understanding of the fission process of actinides in the high excitation energy region.