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Submoment Expansion of Neutron-Scattering Sources
Volume 134 · Number 2 · February 2000 · Pages 218-226
Technical Note
Mark L. Williams
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The submoment method was originally introduced to compute spherical harmonic moments of the neutron elastic-scattering source for discrete ordinates calculations with pointwise nuclear data. This work extends the submoment method to include discrete-level inelastic, as well as elastic, S-wave reactions. New applications of the submoment expansion to compute spherical harmonic moments of the slowing-down density and the elastic removal rate are also presented. Numerical stability and computational considerations are discussed.
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