25. Re-analysis of Integral Experiment on Beryllium at JAEA/FNS

摘要

We tried to specify a reason for the overestimation of experimental data on low energy neutrons in the beryllium benchmark experiment at JAEA/FNS. We found out that it was highly possible that the calculated thermal neutron peak was too large or the thermal neutron peak energy was too low. As one trial, we examined the case of 600 K in order to increase the thermal peak energy, though this trial was unphysical. The thermal neutron peak energy in 600 K was shifted to higher energy than that in 300 K and the calculation results for 600 K agreed with the experimental data better than those in 300 K.