Abstract
The use of two overlapping thermal groups has been recommended by a number of authors for the study of problems such as the variation of thermal spectra across lattice cells and flux peaking in water gaps. In this paper, the Kottwitz problem (two semi-infinite media at different temperatures, with neither sources nor absorption present) is used as an example and three different methods for calculating the removal cross sections between the groups are presented.Numerical values for the removal cross sections are quoted using the free gas model of thermalization. If the diffusion coefficient of a medium is independent of energy, its removal cross sections are found to be independent of temperature. The work requires extending to situations with finite absorption, and more sophisticated models of thermalization should be used.
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Schedule a callMore From: Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology
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