| Summary: | The independent formation cross-sections of ('84,86)Rb,('116m,117m,117g)In, and ('132,134m,134m+g,136)Cs from ('233)U(p,f) and ('235)U(p,f) reactions, and the independent formation cross-sections of ('72)Ga from ('233)U(p,f) reactions were measured radiochemically in the energy range 35 to 90 MeV. The isotopic distributions of Rb, In, and Cs from ('233)U(p,f) and ('235)U(p,f), and the isotopic distributions of Ga from ('233)U(p,f) were measured in the energy range 40 to 100 MeV using the on-line mass spectrometric technique; their relative yields were normalized to the independent formation cross-sections measured radiochemically. === The variations of the FWHM, mean mass numbers, and mean neutron-to-proton ratios of the isotopic distributions were studied. The experimental results indicate that the mean masses of the distributions vary linearly with their atomic numbers. In conjunction with the fission option of the pre-equilibrium/exciton model, the experimental data were used to estimate average total neutron yields. The results show that there are more neutrons emitted for near-symmetric fissions than for asymmetric fissions. The charge distribution postulates, ECD, MPE, and UCD, were examined. In the energy range studied the results indicate that the MPE postulate accounts for asymmetric fissions, and the UCD postulate accounts for near-symmetric fissions.
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