Abstract
A method, which allows the calculation of the neutron-flux distribution at the interior of air gaps of any geometry, is applied. From the values of the vectorial flux at the surface, and from the form of this surface, the neutron flux at any interior point of the gap can be evaluated. The diffusion theory gives the values of the flux and its normal derivative at any point of the surface. Those values are all we need for the determination of the vectorial flux (in this approximation). In the case of two concentric infinite cylinders (the interior one being a black rod), we arrived at a remarkable result: the flux shows a maximum inside the gap. We explain the physical significance of this effect.
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