Time-Resolution Function of the RADEX Neutron Source
R. M. Djilkibaev
Abstract
The time-resolution function is one of the key factors determining the accuracy of neutron-resonance parameter reconstruction in time-of-flight experiments. A method is proposed for determining the time-resolution function of the RADEX neutron source associated with neutron slowing down in the target, based on detailed Geant4 modeling. The neutron time spectra obtained in the Geant4 simulations are approximated by a sum of three Gamma functions with dimensionless parameters. This model is shown to describe the shape of the time distributions well over the neutron-energy range 50--300 eV. To test the applicability of the proposed approach to a source of a different design, a comparison is made with the calculated n\TOF time-resolution function. Its shape is also shown to be well described by a three-component Gamma model.
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