Abstract
Perturbations caused by homogeneous neutron absorbing and scattering rods to the thermal neutron flux distribution within a volume of moderator are measured and compared with response coefficient theory, which has been developed for idealized problems. It is found that although the theory predicts the shape of the asymptotic flux perturbation correctly in general, it overestimates the size of the perturbation. It is shown that this discrepancy can be attributed primarily to rod end effects, which in turn suggests that the theory should be used with caution in reactor calculations where these effects are important.
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