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EDP Sciences EPJ Web of Conferences 284
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    초록·키워드

    Recently, great interest has been generated in using lead as a coolant for fast neutron sys tems and as a result it is important to investigate the ENDF/B-VIII.0 [6] isotopic evaluations that comprise stable le ad. To this end, resonance parameters for 206 Pb, 207 Pb, and 208 Pb were re-evaluated because their resolved reso­ nance regions extend beyond 0.5 MeV meaning resonance parameters used in reconstructing cross sections and elastic scattering angular distributions impact fast systems. The impact of resonance parameters is demon­ strated by the differences between the evaluations in predicting experimental results from the fully modeled RPI Quasi-Differential Scattering Experiment[lO] via MCNPv6.2 [12]. In addition , MCNP KCODE calculations of lead-sensitive fast spectra critical benchmarks showed variations of keff on average of 400 pcm, caused solely from differences in elastic scattering angular distributions in 208 Pb. Re-evaluation entailed fitting data with the program SAMMY[l8].

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