The observed differences of the neutron fluxes between experiments and calculations on passage of neutrons through thick layers of iron and steel are conditioning the use of better models for representing the scattering cross-sections and energy-angle distributions of neutrons in elastic and inelastic scattering. The effect of the NJOY99 and GRUCON prepared nuclear data for Fe, Cr, and Ni on Keff and functionals related with the neutron fluxes in systems with a thermal and a fast spectrum is studied. The calculations were performed using MCNP5, and all nuclear data fi les are based on ENDF/B VII.1.

中文翻译：

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NJOY 和 Grucon 处理代码在钢核素核数据准备中的作用

在中子穿过厚厚的钢铁层的实验和计算之间观察到的中子通量的差异正在调节使用更好的模型来表示弹性和非弹性散射中中子的散射截面和能量角分布。研究了 NJOY99 和 GRUCON 为 Fe、Cr 和 Ni 准备的核数据对 Keff 和与热谱和快谱系统中子通量相关的泛函的影响。计算使用 MCNP5 进行，所有核数据文件均基于 ENDF/B VII.1。