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Cross Sections for 239Pu(n,f) and 241Pu(n,f) in the Range En = 0.01 eV to 200 MeV

F. Tovesson, T. S. Hill

Nuclear Science and Engineering

Volume 165 / Number 2 / June 2010 / Pages 224-231


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The 239Pu and 241Pu neutron-induced fission cross sections have been measured from subthermal energies to 200 MeV. These measurements are part of a campaign to measure fission cross sections with high precision in support of advanced fast reactor technology. Plutonium-241 is the most active target measured in this program to date, with a half-life of 14.4 yr. The results for 239Pu are in good agreement with previous experiments and add new information to the limited knowledge on the fission cross section above 30 MeV. Discrepancies of up to 30% between the evaluations and the experimental data for 241Pu are found in the fast region, which is of particular importance for fast spectrum reactor technology, and a reevaluation of the fission cross section for this isotope is recommended.

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