Abstract
This paper describes the application of perturbation theory to two-velocity-group neutron problems. We consider the exact integral equations satisfied by the neutron densities. The treatment is, therefore, not restricted to systems whose dimensions are large compared with thè relevant mean free paths, and is more general than that reported by Glasstone and Edlund. The latter describe a theory, due to Wigner, in which it is assumed that the neutron densities satisfy the diffusion equations, i.e. the theory is applicable only to large systems.
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