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- W1489324884 abstract "Both ORIGEN-S and SOURCES generate thick-target neutron yields and energy spectra from ({alpha},n) reactions in homogeneous materials. SOURCES calculates yield and spectra for any material containing {alpha}-emitting and ({alpha},n) target elements by simulating reaction physics, using {alpha}-emission energy spectra, elemental stopping cross sections, ({alpha},n) cross sections for target nuclei, and branching fractions to produce-nuclide energy levels. This methodology results in accurate yield and spectra. ORIGEN-S has two options for calculating yields and spectra. The UO{sub 2} option (default) estimates yields and spectra assuming the input {alpha}-emitters to be infinitely dilute in UO{sub 2}. The borosilicate-glass option estimates yields from the total input material composition and generates spectra purportedly representative of spectra generated by {sup 238}Pu, {sup 241}Am, {sup 242}Cm, and {sup 244}Cm infinitely dilute in borosilicate glass, even if none of these four {alpha}-emitters are present in the input material composition. Because yields from the borosilicate-glass option in ORIGEN-S are based on entire input material composition and are reasonably accurate, the same is often assumed to be true for spectra. The input/output functionality of the borosilicate-glass option, along with ambiguity in ORIGEN-S documentation, gives the incorrect impression that spectra representative of input compositions are generated. This impression is reinforced by wide usage of the SCALE code system and its ORIGEN-S module and their sponsorship by the US Nuclear Regulatory Commission." @default.
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- W1489324884 date "1998-12-31" @default.
- W1489324884 modified "2023-09-25" @default.
- W1489324884 title "Comparison of (alpha, n) thick-target neutron yields and spectra from ORINGEN-S and SOURCES" @default.
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