Experimental verification of the theory of neutron diffusion in a medium with voids

Abstract

Experiments are described which have been carried out to verify the theory of diffusion of thermal neutrons in a graphite medium. Measurements of the neutron fluxes in continuous graphite media and in a graphite medium with channels verify the theoretical formulas which relate in a medium with empty channels, the effective diffusion coefficients (and the diffusion lengths) of the thermal neutrons with the lattice parameters of the channels, and the corresponding diffusion coefficient (and diffusion length) in a continuous medium.