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Originally published in the July 2020 issue of Nuclear News.
Welcome to the inaugural edition of the new Nuclear News! What you are seeing is truly the product of a team effort, led by our Director of Publications John Fabian and veteran Editor-in-Chief Rick Michal, to fundamentally reimagine the way we bring you news and insights from the wide world of nuclear science and technology. Nuclear News has always been the flagship publication of the American Nuclear Society, but in recent decades our visual format has gotten a little, well . . . long in the tooth.
E. C. Miller, J. K. Mattingly, S. D. Clarke, C. J. Solomon, B. Dennis, A. Meldrum, S. A. Pozzi
Nuclear Science and Engineering | Volume 176 | Number 2 | February 2014 | Pages 167-185
Technical Paper | dx.doi.org/10.13182/NSE12-53
Articles are hosted by Taylor and Francis Online.
Simulations of neutron multiplicity measurements of a highly multiplicative plutonium sphere measured with a moderated array of 3He proportional counters have consistently overpredicted the mean and variance of the measured multiplicity distribution. In contrast, identical experiments using a 252Cf source have been accurately simulated. This paper outlines a sensitivity analysis of several key parameters that could account for the overprediction in the simulation of the plutonium sphere. Parameters that were analyzed include source-detector distance, detector dead time, variations in density and volume of the plutonium, and the value of for v̅ 239Pu-induced fission. Of these parameters, the only factor that accounted for the overprediction within reasonable bounds was a change in the value of the 239Pu v̅. The sensitivity analysis showed that a small change (1.14% reduction) in the value of v̅ dramatically improved the simulated results.