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Sensitivity and uncertainty analyses of lead sample reactivity experiments at Kyoto University Critical Assembly

Pyeon, C. H.*; Fujimoto, Atsushi*; Sugawara, Takanori  ; Iwamoto, Hiroki   ; Nishihara, Kenji  ; Takahashi, Yoshiyuki*; Nakajima, Ken*; Tsujimoto, Kazufumi 

Sensitivity and uncertainty analyses of lead (Pb) isotope cross sections are conducted with the use of sample reactivity experiments at the Kyoto University Critical Assembly (KUCA). With the combined use of the SRAC2006 and MARBLE code systems, attempts are made to precisely examine the contributions of the reactions and energy regions of Pb isotope cross sections to reactivity based on the covariance data of JENDL-4.0. Moreover, the effect of decreasing uncertainty is discussed in terms of the accuracy of sample reactivity by applying the cross section adjustment method to the uncertainty analyses. From the results of the sensitivity and uncertainty analyses, the reliability of Pb isotope cross sections, such as the Pb isotope covariance data of JENDL-4.0, is compared with the JENDL-3.3, ENDF/B-VII.0, and JEFF-3.1 libraries.

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Category:Nuclear Science & Technology

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