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https://www.ias.ac.in/article/fulltext/pram/085/02/0251-0266

Fission; dissipation; Langevin equations; Fokker–Planck equation; Kramers’ fission width.

It is now established that the transition-state theory of nuclear fission due to Bohr and Wheeler underestimates several observables in heavy-ion-induced fusion–fission reactions. Dissipative dynamical models employing either the Langevin equation or equivalently the Fokker–Planck equation have been developed for fission of heavy nuclei at high excitations (T ∼1 MeV or higher). Here, we first present the physical picture underlying the dissipative fission dynamics. We mainly concentrate upon the Kramers’ prescription for including dissipation in fission dynamics. We discuss, in some detail, the results of a statistical model analysis of the pre-scission neutron multiplicity data from the reactions ¹⁹F+^194,196,198Pt using Kramers’ fission width. We also discuss the multi-dimensional Langevin equation in the context of kinetic energy and mass distribution of the fission fragments.

Santanu Pal^{1 2}

1. CS-6/1, Golf Green, Kolkata 700 095, India
2. Formerly with Variable Energy Cyclotron Centre, Kolkata 700 064, India

Published

August 2015

Early published

24 July 2015