Abstract
Space- and time-dependent neutron thermalization in a 230×190×190cm3 graphite pile has been studied by considering the reaction ratios for Gd/10B, Sm/10B, Cd/10B, Gd/Sm, Gd/Cd and Sm/Cd as spectral indicators. The reaction ratios were measured at r =10, 30, 50 and 70 cm from the fast neutron source placed at the center of the pile. The measurements were repeated at 2. 175 μsec intervals in the time range up to 600 μsec after the fast neutron burst. Theoretical time-dependent reaction ratios were obtained from the calculated space- and time-dependent thermal neutron energy spectra by solving numerically the neutron diffusion equation, using scattering kernels based on various phonon models for graphite. From comparisons of the measured and calculated time-dependent reaction ratios, the adequacy of the various phonon models for graphite is discussed. Also, proof is given of space-dependence shown by the time-dependent thermal neutron spectra ; and the relationship between the space-dependence of the time-dependent neutron spectra and that of the peaking times of the reaction ratios is made clear.
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