Calculations of EURACOS Iron Benchmark Experiment Using the HYBRID Method

The HYBRID method is used in the calculations of the iron benchmark experiment at the EURACOS-II device. The saturation activities of the ³²S(n,p)³²P reaction at different depths in an iron block are computed with ENDF/B-IVdata to compare with the measurements. At the outer layers of the iron block, the HYBRID calculation gives increasingly higher results than the VITAMIN-C multigroup calculation. With the adjustment of the two- to one-dimensional ratios, the HYBRID results agree with the measurements to within 10% at most penetration depths, a considerable improvement over the VITAMIN-C multigroup results. The development of a collapsing method for the HYBRID cross sections provides a more direct and practical way of using the HYBRID method in the two-dimensional calculations. It is observed that half of the window effect is smeared in the collapsing treatment, but it still provides a better cross-section set than the VITAMIN-C cross sections for the deep-penetration calculations.