Bombardment Energy and Fission Product Yield Pattern for Protons on Natural Uranium andU235

Abstract
Relative fission yields of ten nuclides produced by proton-induced fission of natural uranium and U235 were determined at several proton energies in the range 12 to 20 Mev. The expected trend toward symmetric fission at increased energies is observed. A statistical relation is used to correlate this shift in fission symmetry with the excitation energy of the compound nucleus.