Abstract
The fast-neutron-induced fission cross section of 242Pu was determined in the energy range of 0.5 MeV to 10MeV at the neutron time-of-flight facility nELBE. Using a parallel-plate fission ionization chamber this quantity was measured relative to 235U(n,f). The number of target nuclei was thereby calculated by means of measuring the spontaneous fission rate of 242Pu. An MCNP 6 neutron transport simulation was 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
The nELBE data are in good agreement in shape and absolute scale to previous experimental data
The recently published data of Salvador-Castiñeira et al [3] are below the Weigmann cross section ratio. This is of special interest, because the current European evaluation JEFF 3.2 is mainly based on the Weigmann data
Summary
Neutron-induced fission cross sections of actinides such as the Pu-isotopes are of relevance for the development of nuclear transmutation technologies. 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], at the Joint Research Center Geel by Salvador-Castiñeira et al [3] and at the National Physical Laboratory of the United Kingdom in Teddington by Matei et al [5] have been recently published and tend to be lower than the current european data evaluation JEFF 3.2 [6]
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