Abstract
The fission of 232Th by protons of energies 20–85 MeV has been studied. Independent formation cross sections of 90mY, 90m + gY, 91mY, 91m + gY, 92Y, 95 + gNb, 96Nb, 97Nb and 98Nb, and cumulative formation cross sections for 91Sr, 92Sr, 93Y, and 97Zr were measured. Charge dispersion curves were obtained. The full-width at half-maximum remains sensibly constant over this energy range, unlike products studied in the heavy-mass region. The value of Z A − Z p decreases, but does not show the same sensitivity to the N/ Z value of the target, as found in the heavy-mass region. Calculation shows that the data for Z p lie closer to the unchanged charge distribution than that suggested by the equal charge displacement hypothesis. An estimate was made of the number of neutrons emitted in fission. The light fragment was found to emit half the number of neutrons as the heavy fragment.
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