Abstract
Effective resonance integrals calculated by means of the usual approximations do not have the dependence on moderator slowing down properties which is shown by “exact” calculations. In this paper a modified effective resonance integral is defined in such a way as to fit the exponential form of the resonance escape probability. Application of a generalised “intermediate-resonance” approximation to this modified effective resonance integral shows a dependence on the slowing down properties of the moderating nuclei in good agreement with “exact” calculations.
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