Fission Dynamics in the Proton Induced Fission of Actinide Nuclei at Intermediate Energies
Résumé
A multi-parameter correlation study of the reactions 232Th(p,f), 238U(p,f) and 242Pu(p,f) at E_{p}=13, 20, 40 and 55 MeV has been conducted. The fission fragment mass, total kinetic energy distributions, double differential neutron spectra and \gamma-ray spectra have been measured. The three humped shape of mass distributions has been observed up to higher proton energy. Pre-equilibrium, pre-scission and post-scission neutron and \gamma-ray multiplicities measured in coincidence with primary fission fragments provided access to fission dynamics. Shell structure effects were observed in fission fragment mass distributions even at high excitation energy. Manifestation of the nuclear shell Z = 28 near fragment mass A_{fr} = 78 has been detected.