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Benchmark experiment on copper with DT neutron source FNS

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

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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