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A Measurement of the Capture-to-Fission Ratio for Plutonium-239

J. B. Czirr, J. S. Lindsey

Nuclear Science and Engineering

Volume 41 / Number 1 / July 1970 / Pages 56-62


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The ratio of the neutron capture to fission cross section (α) has been measured for 239Pu in the energy range from 100 eV to 30 keV. Neutron time-of-flight techniques were used to obtain data with an energy resolution of approximately 10% at 10 keV. The data yield an average α = 0.80 ± 0.05 between 0.10 and 10 keV for an energy-independent incident neutron spectrum. Also, α data were obtained in the resolved resonance region below 100 eV.

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