Nuclear Charge Dispersion in the Fission of 235 U by Protons of Energy 20–85 MeV

Independent formation cross sections of 129 Cs, 130 Cs, 131 Cs, 134 Cs m , 134 Cs m+g , 136 Cs, 139 Ce, and cumulative formation cross sections of 141 Ce and 143 Ce were obtained when 235 U was caused to fission with protons of energies varying between 20 and 85 MeV. The energies at which the excita...

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Bibliographic Details
Published in:Canadian journal of chemistry 1971-07, Vol.49 (13), p.2205-2216
Main Authors: Saha, G. B., Tomita, I., Yaffe, L.
Format: Article
Language:English
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Summary:Independent formation cross sections of 129 Cs, 130 Cs, 131 Cs, 134 Cs m , 134 Cs m+g , 136 Cs, 139 Ce, and cumulative formation cross sections of 141 Ce and 143 Ce were obtained when 235 U was caused to fission with protons of energies varying between 20 and 85 MeV. The energies at which the excitation functions reached their maxima were related to the neutron-to-proton ratio of the fission products. These were compared with other fissioning systems. Charge dispersion curves were obtained from the cross section data. The variation of (Z A  − Z p ) with energy, both in magnitude and in trend, agrees extremely well with predictions made by Saha and Yaffe for nuclides in this mass range. Calculations for Z p show that good agreement is obtained with the unchanged charge division hypothesis. An estimate has been made of the total number of neutrons emitted in fission at these energies.
ISSN:0008-4042
1480-3291
DOI:10.1139/v71-360