A SURVEY AND EVALUATION OF U$sup 233$ FISSION YIELD DATA Page: 18 of 39
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In addition to the absolute measurements suggested above,
relative yield measurements utilizing radiometric techniques could pro-
vide valuable information. These relative measurements would be well
suited to a study of variation of yield with excitation energy. Except
for the ionization chamber work of Roeland et al. (33), the only measure-
ments made on the variation of U233 fission yields with neutron energy
are the "peak-to-valley" determinations at three resonances (11) and a
fission yield curve for 14-Mev neutrons (10). The remainder of the en-
ergy range is unexplored. That one should observe variation of yields
with energy has been demonstrated in Ref. 11 and more recently in the
very interesting work of Cunninghame et al. (35) and of Levy et al. (36).
Another aspect of U233 fission which has been studied very
little is the distribution of yield with the nuclear charge of the
fission products. Considerable information has been obtained on charge
distribution in the fission of U23 (37) from a study of the cumulative.
yields of early members of fission product chains and the independent
yields of later chain-members. Similar work on the early-member cumu-
lative yields has been performed recently. at the Los Alamos Scientific
Laboratory using U233 (38). Measurement of the appropriate independent
yields for U233, combined with the results from Los Alamos could be a
significant contribution toward understanding nuclear charge distribution
in fission. That knowledge of the charge distribution is important 'to
reactor technology has been pointed out by Chernick (39) for the mass-
Finally, there is the problem of the fine structure of the
mass yield curve. As Hyde (6, pp. 142-145) has pointed out, it is
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Ferguson, R.L. & O'Kelley, G.D. A SURVEY AND EVALUATION OF U$sup 233$ FISSION YIELD DATA, report, July 13, 1962; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1056944/m1/18/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.