Nuclear Science and Engineering / Volume 36 / Number 3 / June 1969 / Pages 326-335
Technical Paper / dx.doi.org/10.13182/NSE69-A18731
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A series of experiments has been performed to study the diffusion of thermal neutrons in Al-H2O plate lattices. Although diffusion perpendicular to the plates could be described by an exponential function, thus defining a diffusion length, such was not the case for diffusion parallel to the plates. Various ancillary experiments support the conclusion that a discrete eigenvalue does not exist for parallel diffusion in such systems. This conclusion is in agreement with the theoretical predictions of Clancy, Durance, and McCulloch, and of Williams.