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Ranking the Importance of Nuclear Reactions for Activation and Transmutation Events

Wayne Arter, J. Guy Morgan, Samuel D. Relton, Nicholas J. Higham

Nuclear Science and Engineering / Volume 184 / Number 4 / December 2016 / Pages 561-574

Technical Paper / dx.doi.org/10.13182/NSE15-23

First Online Publication:October 31, 2016
Updated:December 7, 2016

Pathways-reduced analysis is one of the techniques used by the FISPACT-II nuclear activation and transmutation software to study the sensitivity of the computed inventories to uncertainties in reaction cross sections. Although deciding which pathways are most important is very helpful in for example determining which nuclear data would benefit from further refinement, pathways-reduced analysis need not necessarily define the most critical reaction, since one reaction may contribute to several different pathways. This work examines three different techniques for ranking reactions in their order of importance in determining the final inventory, comparing the pathways-based metric (PBM), the direct method, and a method based on the Pearson correlation coefficient. Reasons why the PBM is to be preferred are presented.

 
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