Covariance generation for the prompt neutron multiplicity of 239Pu including the (n,γf) process
1 Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (USA)
2 CEA/DEN/DER/SPRC/LEPh/Cadarache center, F-13108 Saint Paul Lez Durance (France)
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1 Developed at CEA/Cadarache
Published online: 30 September 2020
Fission cross section of 239Pu can be seen as a sum of the “immediate" fission and “two-step" (n,γf) reactions. In the Resolved Resonance Range of the reaction cross sections, the contribution of the (n,γf) process has an impact on the determination of the partial widths magnitude involved in the Reich-Moore approximation of the R-matrix theory. The present work aims to investigate this impact by using the CONRAD code and the partial width Γγf for the (n,γf) reaction calculated by Lynn et al. . A special attention will be paid to the covariance matrix obtained on νp.
© The Authors, published by EDP Sciences, 2020
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