现代应用物理2025，Vol.16Issue(4)：88-96,9.DOI:10.12061/j.issn.2095-6223.202410008
氢化钇热中子散射截面制作
Generation of Thermal Neutron Scattering Cross Sections for Yttrium Hydride
摘要
Abstract
Yttrium hydride is considered as an ideal moderator for micro-reactors because of its high hydrogen content and high operating temperature.The neutron thermalization mechanism of YHx is determined by its thermal neutron scattering cross sections,which are related to the phonon densities of states of YHx.Although the thermal neutron scattering cross sections of YHx have been provided in the latest version of the ENDF/B-VIII.0 database,they are availabe for YH2.Based on first-principle calculations,the variation law of the phonon densities of states for YHx with different H/Y ratio is studied,and an accurate calculation of the thermal neutron scattering for YHx is established.Using the extended ENDF6 format and considering both the incoherent and coherent elastic scattering of Y in YHx,a modified NJOY program and Monte Carlo simulations are employed to support the generation and application of the proposed ACE format thermal neutron scattering files.The results show that the modified thermal neutron cross section datas of YHx are more consistent with objective laws and more accurate than the existing ones.At the same time,the method developed in this paper can be applied to the preparation of the thermal neutron cross-section library of other metal hydrides,laying a foundation for the study of neutron thermal effects of moderator materials in the low-energy region.关键词
氢化钇/第一性原理/声子态密度/热中子散射/混合弹性散射Key words
yttrium hydride/first-principles/phonon density of states/thermal neutron scattering/mixed elastic scattering分类
能源科技引用本文复制引用
刘峻岭,王立鹏,江新标,孔令体,曹璐,姜夺玉,胡田亮..氢化钇热中子散射截面制作[J].现代应用物理,2025,16(4):88-96,9.基金项目
国家自然科学基金资助项目(12275219) （12275219）
