Abstract
The fast neutron-induced fission cross section of 242 Pu was determined in the range of 0.5 MeV to 10 MeV relative to 235 U(n,f) at the neutron time-of-flight facility n ELBE. The number of target nuclei was calculated by means of measuring the spontaneous fission rate of 242 Pu. Neutron transport simulations with Geant4 and MCNP6 are used to correct the relative cross section for neutron scattering. The determined results are in good agreement with current experimental and evaluated data sets.
Highlights
Neutron-induced fission cross sections of actinides such as the Pu-isotopes are of relevance for the development of nuclear transmutation technologies
At nELBE fast neutrons between 10 keV and 20 MeV are generated by a photo-neutron source
The nELBE data are in good agreement in shape and absolute scale to present nuclear data
Summary
Neutron-induced fission cross sections of actinides such as the Pu-isotopes are of relevance for the development of nuclear transmutation technologies. There is a special interest to investigate the fission of this particular isotope using fast neutrons. The fast neutron-induced fission cross section of 242Pu was studied first by Butler in 1960 [2]. A brief summary of the available experimental data acquired since is given in Ref. Results of measurements at the Los Alamos National Laboratory by Tovesson et al [4] and at the Joint Research Center Geel by Salvador-Castineira et al [3] were published recently and tend to be lower than present evaluated nuclear data [5]
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