Abstract The JANUS Phase 7 shielding experiment performed in the NESTOR experimental reactor in 1991 studied deep fast neutron propagation in mild steel, boron carbide and sodium. Several steel plates, followed by boxes containing boron carbide and sodium were used as neutron shielding next to a fission plate. Gold, manganese, rhodium and sulphur detectors were positioned at several depths in order to measure the neutron flux at different energies. This experiment is interpreted using the Monte-Carlo code TRIPOLI-4® and different nuclear data for iron 56 and sodium. C/E results exhibit discrepancies generally smaller than 10% for the gold detector, while larger discrepancies are obtained for the sulphur detector. In order to understand the obtained biases, sensitivity calculations were performed to compute the uncertainties on the detector responses due to nuclear data. We show that the propagated uncertainties may explain a large part of the observed discrepancies.

中文翻译：

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用 TRIPOLI-4® 解释 JANUS 第 7 阶段屏蔽实验和量化由于核数据引起的不确定性

摘要 1991 年在 NESTOR 实验反应堆中进行的 JANUS 第 7 阶段屏蔽实验研究了低碳钢、碳化硼和钠中的深快中子传播。几个钢板，然后是装有碳化硼和钠的盒子，用作裂变板旁边的中子屏蔽。金、锰、铑和硫探测器位于多个深度，以测量不同能量下的中子通量。该实验使用蒙特卡罗代码 TRIPOLI-4® 和不同的 56 铁和钠的核数据进行解释。金检测器的 C/E 结果显示的差异通常小于 10%，而硫检测器的差异更大。为了理解获得的偏差，进行了灵敏度计算，以计算由于核数据引起的探测器响应的不确定性。我们表明，传播的不确定性可以解释大部分观察到的差异。