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The effect of target thickness on 14.8 MeV neutron induced fission of232Th

Authors
Journal
Journal of Inorganic and Nuclear Chemistry
0022-1902
Publisher
Elsevier
Publication Date
Volume
43
Issue
7
Identifiers
DOI: 10.1016/0022-1902(81)80314-4
Disciplines
  • Chemistry

Abstract

Abstract Targets of thorium nitrate tetrahydrate were pressed into discs of varying thickness, stacked, and irradiated with 14.8 MeV neutrons for 1–2 hr. Radiochemical analysis was performed on the dissolved samples for 99Mo and 113Ag. The ratios of the equilibrium activities of these two fission produced nuclides were calculated which indicate a peak-to-valley representation of the fission process. It was found as the sample thickness increased the ratio of the 99 Mo 113 Ag increased.Elastic scattering of the neutrons within the target materials appears to be the explanation for the observed change in the disappearance of the symmetric mode of fission of 232Th observed at the higher neutron energies. An estimation of the relative contributions of symmetric and asymmetric fission was made for the 14.8 MeV neutron induced fission of 232Th.

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