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Nuclear data in the actinide region are particularly important because they are basis  behind all simulations of nuclear reactor core behaviour over both long time scales (fuel  depletion and waste production) and short time scales (accident scenarios). Nuclear  reaction cross sections must be known as precisely as possible so that core reaction rates  can be accurately calculated. Although cross section measurements in this region have been  widely performed, for certain nuclei, particularly those with short half lives, direct  measurements are either very difficult or impossible and thus reactor simulations must  rely on theoretical calculations or extrapolations from neighbouring nuclei. The greatest  uncertainty in theoretical cross section calculations comes from the lack of knowledge of  level densities, for which predicted values can often be incorrect by a factor of two or  more. Therefore there is a strong case for a systematic experimental study of level  densities in the actinide region for the purpose of a) providing a stringent test of  theoretical cross section calculations for nuclei where experimental cross section data  are available and b) for providing better estimations of cross sections for nuclei in  which no cross section data are available

Nuclear Data for Reactor Physics: Cross sections and level densities in the actinide region