Abstract
The significant discrepancies often observed between the discrete Sn calculations and the measurements of the angular flux spectrum of neutrons at an angle of 0° have been studied for the benefit of analyses of time-of-flight measurements. Examination of the uncollided angular flux and scalar flux distribution yielded information on the relation between the accuracies obtainable in the calculations and the order of quadrature set used therein. Predictions on the angular flux in graphite resulting from the use of S 16, S 32 and S 48 quadratures, and on the scalar flux in water from the S 16 quadrature were compared with the results of measurements and of PALLAS transport calculations. It was found as a result that the. S 48 quadrature is most suitable for analyzing the 0° angular flux spectrum of the time-of-flight measurements, and that the S 16 quadrature is sufficient for scalar neutron flux calculations for reactor shields. The spurious fluctuations observed in the ANISN angular distributions are not due to insufficiency in the number of iterations in computation, but to the coarseness of the spatial intervals used.
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