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核融合DT中性子源FNSを用いた銅ベンチマーク実験

Benchmark experiment on copper with DT neutron source FNS

権 セロム*; 太田 雅之*; 佐藤 聡*; 今野 力; 落合 謙太郎*; 鈴木 寛光*

Kwon, Saerom*; Ota, Masayuki*; Sato, Satoshi*; Konno, Chikara; Ochiai, Kentaro*; Suzuki, Hiromitsu*

銅は磁場閉じ込め式核融合炉の超伝導コイルやIFMIFのような加速器中性子源で使われる材料で、核解析で用いられる銅核データの信頼性への要求は極めて高い。そこで原子力機構の核融合DT中性子源FNSで銅核データベンチマーク実験を実施し、放射化箔、核分裂計数管を用いて反応率を測定した。この実験解析をMCNPコード, 核データライブラリーJENDL-4.0, ENDF/B-VII.1(FENDL-3.0), JEFF-3.2を用いて行い、閾反応の反応率は計算値と実験値がよく一致しているものの、低エネルギー中性子に感度を持つ反応の反応率は計算値が実験値を大幅に過小評価することがわかった。銅核データを詳細に調べ、この過小評価を改善するには共鳴領域の弾性散乱、捕獲反応断面積を修正する必要があることを明らかにした。

Copper is used as a material for superconducting coil in magnetic confinement fusion reactor and for accelerator-driven neutron source such as IFMIF. Hence, well-reliable copper nuclear data is in high-priority study to achieve for their neutronics analyses. We carried out copper nuclear data benchmark experiment on copper assembly with Li$$_{2}$$O layers for interruption of background neutrons at JAEA/FNS, and measured reaction and fission rates using activation foils and micro fission chambers. The results were analyzed using MCNP-5.140 with the latest nuclear data libraries, JENDL-4.0, ENDF/B-VII.1 (FENDL-3.0) and JEFF-3.2. We found out that the calculated results related to threshold reactions agreed well the measured ones, but those related to low energy neutrons exceedingly underestimated the measured ones in the experiment. In order to resolve the underestimation issues, we pointed out that a drastic reassessment of cross sections of elastic scattering and capture reaction in the resonance region was unavoidable.

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