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The cross sections of  237 Np and  238 Np are important for accurate modeling and simulation of  238 Pu in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL). Uncertainties in these cross sections can impact the ability to predict and optimize the target design and loading for  238 Pu production targets. The effective capture cross section of  237 Np in the location of pneumatic tube 1 in HFIR was measured as a first step in the measurement of the  238 Np capture and fission cross sections. This paper describes the flux measurements,  237 Np experiments, and data analysis of the  237 Np capture cross section in HFIR.

Measurement of the Effective Capture Cross Section of 238 Np in the High Flux Isotope Reactor