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Cross section measurements in the fast energy region are being demanded as one of the key ingredients for modelling Generation-IV nuclear power plants. However, in facilities where there are no time-of-flight possibilities or it is not convenient to use them, using the 235U(n,f) cross section as a benchmark would require a careful knowledge of the room scatter in the experimental area. In this paper we present measurements of two threshold reactions, 238U and 237Np, that could become a standard between their fission threshold and 2.5 MeV, if the discrepancies shown in the evaluations and in some experimental data can be solved. The preliminary results are in agreement with the present ENDF/B-VII.1 evaluation.JRC.G.2-Standards for Nuclear Safety, Security and Safeguard

Absolute and relative cross section measurements of237Np(n,f) and238U(n,f) at the National Physical Laboratory

Absolute and relative cross section measurements of²³⁷Np(n,f) and²³⁸U(n,f) at the National Physical Laboratory