Elsevier

Nuclear Physics A

Volume 212, Issue 3, 1 October 1973, Pages 556-572
Nuclear Physics A

Ratio of the ternary to binary fission induced by thermal and resonance neutrons in 239Pu

https://doi.org/10.1016/0375-9474(73)90823-3Get rights and content

Abstract

Measurements were performed of the ratio of ternary to binary fission (T/B) in 239Pu by neutrons in the energy region from 0.020 eV to 50 eV. The ternary and binary fission time-of-flight spectra were recorded at a 8.1 m flightpath at the Geel Linac with large gold-silicon surface-barrier detectors on both sides of a 1 mg/cm2 double-faced 239Pu target. From these time-of-flight spectra the ratios of the areas of the strongest isolated resonances in ternary and in binary fission were calculated; moreover in the region 0.02–1 eV ratios were calculated for about 40 zones throughout the spectrum. The T/B ratio does not vary significantly in the energy region below 1 eV; this is not the case in the region 1–50 eV, where the T/B value for the 15.5 eV resonance is significantly larger than for the other resonances. These T/B values seem to be correlated with the resonance spin J and with some other fission characteristics.

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