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首页> 外文期刊>Annals of nuclear energy >Thermal scattering law data generation for hydrogen bound in zirconium hydride based on the phonon density of states from first-principles calculations
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Thermal scattering law data generation for hydrogen bound in zirconium hydride based on the phonon density of states from first-principles calculations

机译:基于第一原理计算的氢化锆在氢化物中氢气结合的热散射法生成

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摘要

The thermal neutron scattering cross sections of zirconium hydride (ZrHx) is heavily affected by its lattice structure which can be represented by phonon density of states (DOS). In the past decades, many works tried to get parameterized phonon DOS of ZrHx, by fitting certain types of experimental results. In the present work, we adopt the first-principles calculation to obtain the phonon DOS of ZrH(1.5 )in delta phase and ZrH2 in epsilon phase. The theoretical phonon DOS is used to calculate the thermal scattering cross sections which are then used in the neutronics simulations of several TRIGA reactors. The numerical results show that the phonon DOS obtained by first-principles calculations can produce more accurate scattering cross sections, and improve the neutronics results of TRIGA reactors compared with the phonon DOS models applied in ENDF/B and JEFF evaluated nuclear data libraries. (C) 2021 Elsevier Ltd. All rights reserved.
机译:硫化锆(ZrHx)的热中子散射横截面受其晶格结构的严重影响,其晶格结构可以由状态(DOS)的声子密度表示。 在过去的几十年中,许多作品试图通过拟合某些类型的实验结果来获得Zrhx的参数化素数。 在本作工作中,我们采用了第一原理计算,以获得ZRH(1.5)的ZRH(1.5)的ZrH(1.5)中的ZRH2中的ePsilon阶段。 理论声音DOS用于计算热散射横截面,然后在几个Triga反应器的中子体模拟中使用。 数值结果表明,通过第一原理计算获得的声子DOS可以产生更精确的散射横截面,并与施用的endf / B和Jeff评估的核数据库相比,改善了Triga反应器的中子学结果。 (c)2021 elestvier有限公司保留所有权利。

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