Nuclear Science and Engineering / Volume 15 / Number 2 / February 1963 / Pages 161-165
Technical Paper / dx.doi.org/10.13182/NSE63-A26416
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The normal calculations of disadvantage factors in slab geometry are performed with the odd-order spherical harmonics approximations; however, by the use of the complementary even-order results in conjunction with these standard solutions, a more accurate answer can be quickly obtained. Since the even-order approximations give an apparent upper bound on the true answer, a combination of low odd and even-order solutions produces a counterconvergence effect which closely brackets the true disadvantage factor. In particular the theory of the P4 calculation is presented along with various numerical parameter studies.