Abstract
Cross-sections for the independent formation of 139Ba, 139Ce, 140La, 141La, 141Ce and 143Ce and the cumulative formation of 139Cs, 140Ba, 141La, 141Ba, 141Ce, 143La and 144Ce have been determined in the fission of 232Th by protons of energies 28–83 MeV. Charge dispersion curves have been constructed from these data with slight corrections for the variation of N Z p as a function of A. Observations are made about the shapes of the curves obtained in the present work and previously if one plots, from the excitation functions, the energy at which a certain fission product will have the maximum yield against its value of N Z . This is related to the advent of symmetric fission. Observations are also made about charge dispersion curves as a function of single and multi-chance fission.
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