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Theoretical calculations indicate that the value of the Feynman variance, Y2F for the emitted distribution of neutrons from fissionable exhibits a strong monotonic dependence on a the multiplication, M, of a quantity of special nuclear material. In 2012 we performed a series of measurements at the Passport Inc. facility using a 9MeV bremsstrahlung CW beam of photons incident on small quantities of uranium with liquid scintillator detectors. For the set of objects studies we observed deviations in the expected monotonic dependence, and these deviations were later confirmed by MCNP simulations. In this report, we modify the theory to account for the contribution from the initial photo-fission and benchmark the new theory with a series of MCNP simulations on DU, LEU, and HEU objects spanning a wide range of masses and multiplication values.

Feynman variance for neutrons emitted from photo-fission initiated fission chains - a systematic simulation for selected speacal nuclear materials