# Determining the Np( , ) cross section using the surrogate ratio method
Neutron-induced fission cross section data are needed in various fields of applied and basic nuclear science. However, cross sections of short-lived nuclei are difficult to measure directly due to experimental constraints. The first experimental determination of the neutron-induced fission cross section of Np at non-thermal energies was performed. The Surrogate Ratio Method (SRM) was employed to indirectly deduce the Np( , ) cross section. The surrogate reactions used were U and U with the reference cross section given by the well-known Np( , ) cross section. The ratio of observed fission reactions resulting from the two formed compound nuclei, Np and Np, was multiplied by the directly-measured Np( , ) cross section to determine the Np( , ) cross section. The Np( , ) cross section was determined with an uncertainty ranging between 3 - 30% over the energy range of 0.2 - 20 MeV.
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