Systematics of Fragment Mass and Energy Distributions for Proton-Induced Fission ofU233,U235, andU238

Thin targets of ^{233}\mathrm{U} ^{235}\mathrm{U} and ^{238}\mathrm{U}were bombarded with protons of several energies between 7 and 13 MeV. Correlated energies of fission-fragment pairs were measured with silicon surface-barrier detectors. Fragment mass vs total kinetic energy distributions were deduced, and their systematic variation with bombarding energy was studied. It was found that the yield in the valley of the mass distributions...