Abstract
Neutron diffusion parameters in water at a room temperature of 10°C have been measured by the pulsed neutron method for the range of geometrical buckling from 0.093 to 1.36 cm-2. The results are 205±4 μ60 for the neutron mean life time due to absorption, 34,120±610 cm2·sec-1 for the diffusion coefficient and 3,350±560 cm4·sec-1 for the diffusion cooling coefficient. The decay constant has been calculated as a function of buckling for the Nelkin and the Rad-kowsky scattering models of water on the assumption of linear anisotropic scattering. The calculated diffusion coefficients, 36,290 cm2·sec-1 for the Nelkin model and 37.610 cm2·sec-1 for the Radkowsky model, are somewhat higher than the experimental result. It is shown that the calculated diffusion coefficient approaches the experimental value if we use μ-(E), the mean value of cosine of scattering angle, obtained from the Beyster's experiment instead of that for the Nelkin model.
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