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DOE OSTI · 2342042

(U) Release of SOURCES4D Featuring Sensitivity Capabilities

Favorite, Jeffrey A.
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Abstract

SOURCES is a code for computing neutron source rates and spectra from spontaneous fission (including delayed neutrons) and (α,n) reactions. The first release since 2002, SOURCES4D, is now available. The main updates include new output that allows the user to calculate, in post-processing, first and second derivatives of the (α,n) source rate density and spectrum with respect to nuclide densities in a homogeneous material and first derivatives of the (α,n) source rate density and spectrum with respect to nuclide stopping powers and (α,n) cross sections (nuclear data). The value of π was made more accurate in order to eliminate negative spontaneous-fission sources. Otherwise, SOURCES4D has made no changes to the physics or data of neutron source calculations used in SOURCES4C. First and second derivatives are calculated in an example problem.

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Favorite, Jeffrey A.. 2024-04-29. (U) Release of SOURCES4D Featuring Sensitivity Capabilities. https://doi.org/10.2172/2342042

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