Abstract
The adjoint flux calculated by multigroup effective cross sections generated by considering the conservation of reaction rates in the direct flux has a noticeable error, especially in the resonance energy range. An equivalence principle for adjoint flux is developed for the calculation of multigroup effective cross sections to be used in adjoint flux calculation. These multigroup effective cross sections can be tabulated as functions of two independent parameters; namely the equivalent cross section and the total macroscopic cross section of the moderator medium. The numerical calculations show a linear dependence of the multigroup effective cross sections on the second parameter.
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