Monte Carlo analysis of the propagation of fusion neutrons in a high enriched uranium system

► Monte Carlo analysis of the propagation of fusion neutrons in a highly compact 90% U enriched system. ► MCNP model introduces all the heterogeneities of the system up to the local perturbation of the detector. ► The full analysis defines ideal experimental conditions in order to have an asymptotic complex wave vector. ► Even under non-ideal conditions Fourier transform of the detection rate is an observable to compare with MCNP calculations. ► The good results of this comparison emphasize the limitation of previous approximations to describe the experiment.