Schulc Martin, Košťál Michal, Harutyunyan Davit, Novák Evžen
Research Centre Rez Ltd, 250 68 Husinec-Řež 130, Czech Republic.
Research Centre Rez Ltd, 250 68 Husinec-Řež 130, Czech Republic.
Appl Radiat Isot. 2018 Mar;133:45-50. doi: 10.1016/j.apradiso.2017.12.014. Epub 2017 Dec 19.
Fast neutron leakage spectra from the light and heavy water sphere of 30cm in diameter with neutron source in its centre were measured by a stilbene scintillation detector in the region of 1-10MeV in the distance of 85cm from the spheres surface. We use the light and heavy water to eliminate the effect of hydrogen. Cf with the approximate emission rate of 5.5E8 n/s was used as a neutron source for all measurements involved and was placed in the centres of the spheres. The measured neutron spectra are compared with MCNP transport code calculations in ENDF/B-VII.0, ENDF/B-VIII.b4 and JENDL-4 nuclear data libraries. Experimental results for both cases follows similar trend. The best agreement is achieved with ENDF/B-VIII.b4 library in both cases. All libraries underestimate experimental measurement in the region of 3-4MeV. Furthermore, JENDL-4 library overestimates experiment in the region of 4-6.5MeV. In addition, we performed cross section sensitivity analysis for elastic, inelastic and (n,α) reaction in JENDL-4 and ENDF/B-VIII.b4 libraries since they have almost independent evaluations of O.
在距离直径30厘米的轻水球和重水球表面85厘米处，使用蒽闪烁探测器在1 - 10兆电子伏特的能量区域测量了中子源位于球心时的快中子泄漏能谱。我们使用轻水和重水来消除氢的影响。在所有相关测量中，使用发射率约为5.5E8 n/s的Cf作为中子源，并将其放置在球心。将测量得到的中子能谱与ENDF/B - VII.0、ENDF/B - VIII.b4和JENDL - 4核数据库中的MCNP输运代码计算结果进行比较。两种情况下的实验结果都呈现出相似的趋势。在两种情况下，与ENDF/B - VIII.b4数据库的一致性最好。所有数据库在3 - 4兆电子伏特区域都低估了实验测量值。此外，JENDL - 4数据库在4 - 6.5兆电子伏特区域高估了实验值。另外，由于JENDL - 4和ENDF/B - VIII.b4数据库对O的评估几乎相互独立，我们对这两个数据库中的弹性、非弹性和(n,α)反应进行了截面灵敏度分析。
