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THEORETICAL AND EXPERIMENTAL EVALUATION OF THE DISTRIBUTION OF THERMALIZED 15-MeV NEUTRONS IN A FINITE WATER MODERATOR.

. The energydependent diffusion equation was used to describe the spatial distribution of moderated neutrons. One of the most expedient ways of solving this equation is the multigroup method. The theory of this method is discussed and a general solution of the multigroup equation is derived. An explanation of the methods used to determine the values of the parameters needed in the solution of the multigroup equation is also presented. The multigroup method is then applied to the problem of the thermalization of neutrons from a point source of 15 MeV neutrons in a f ~ t e water moderator. In particular, an eight-group approximation is compared to an experimentally measured thermal neutron flux distribution in the water moderator. The experimental data verify the theoretical results. A theoretical slowing-down age of 15 1.7 cm2 is calculated for 15 MeV neutrons which have been slowed down below 0.55 eV.