Abstract
Neutron diffusion parameters in water were measured at 26.7 deg C with the pulsed neutron technique. The results are 210 plus or minus 1 mu sec for the neutron mean lifetime, 37503 plus or minus 366 cm/sup 2/ sec/sup -1/ for the average diffusion coefflcient, and 5116 plus or minus 776 cm/sup 4/ sec/sup - 1/ for the diffusion cooling constant. From these values the thermal absorption cross sectlon of hydrogen and the thermal diffusion length in water can be lnferred to be 325 plus or minus 2 mb and 2.83 plus or minus 0.02 cm, respectively. With a pulsed high-intensity neutron source provided by an electron linear accelerator, neutron lifetime measurements were performed on small and large water samples wlth values of the geometrlcal buckling from 0.014 cm/sup -2/ to 0.59 cm/sup -2/. Effects of harmonic modes in the large water geometrles, whlch were determined by measurements of the time-dependent spatial flux distributlons resulting from an external pulsed source of fast neutrons, were found to be adequately predictable with slmple diffuslon theory. (auth)
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