Abstract

Measurements of ²⁴³Am and ²³⁵U fission reaction rates are conducted with the use of two single fission chambers in the solid-moderated and solid-reflected core at the Kyoto University Critical Assembly (KUCA). Critical irradiation experiments of ²⁴³Am and ²³⁵U foils are carried out, and the measured result of ²⁴³Am/²³⁵U is 0.0424 ± 0.0019; also, calculation/experiment values between calculated (MCNP6.1 with JENDL-4.0, ENDF/B-VIII.0, and JEFF-3.3) and measured results of ²⁴³Am/²³⁵U range among 0.93 ± 0.04, 0.94 ± 0.04, and 0.93 ± 0.04, respectively. Through a comparison between the measured and calculated results, the ²⁴³Am fission cross-section data of the three major nuclear data libraries are successfully validated, demonstrating the same accuracy as that of previous minor actinide irradiation experiments at KUCA. Importantly, the comparison also provides the complemental data of integral experiments of ²⁴³Am fission reaction rates that confirm the accuracy of the ²⁴³Am fission cross-section data.

摘要

²⁴³ Am 和²³⁵ U 裂变反应速率的测量是在京都大学关键组件 (KUCA) 的固体慢化和固体反射核心中使用两个单裂变室进行的。的临界辐照实验²⁴³ Am和^235个ü箔进行，并且所测量的结果²⁴³的AM / ²³⁵ U是0.0424±0.0019; 此外，计算（MCNP6.1 与 JENDL-4.0、ENDF/B-VIII.0 和 JEFF-3.3）和²⁴³ Am/ ²³⁵ U 的测量结果之间的计算/实验值介于0.93 ± 0.04、0.94 ± 0.04 和分别为 0.93 ± 0.04。通过比较实测结果和计算结果，成功验证了三个主要核数据库的²⁴³ Am 裂变截面数据，证明与之前在 KUCA 进行的小锕系元素辐照实验具有相同的准确性。重要的是，该比较还提供了²⁴³ Am 裂变反应速率积分实验的补充数据，证实了²⁴³ Am 裂变截面数据的准确性。