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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >ATTENUATION OF THERMAL NEUTRONS BY AN IMPERFECT SINGLE CRYSTAL
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ATTENUATION OF THERMAL NEUTRONS BY AN IMPERFECT SINGLE CRYSTAL

机译：不完美单晶对热中子的衰减

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A semi-empirical formula is given which allows one to calculate the total thermal cross section of an imperfect single crystal as a function of crystal constants, temperature and neutron energy E, in the energy range between 3 meV and 10 eV. The formula also includes the contribution of the parasitic Bragg scattering to the total cross section that takes into account the crystal mosaic spread value and its orientation with respect to the neutron beam direction. A computer program (ISCANF) was developed to calculate the total attenuation of neutrons using the proposed formula. The ISCANF program was applied to investigate the neutron attenuation through a copper single crystal. The calculated values of the neutron transmission through the imperfect copper single crystal were fitted to the measured ones in the energy range 3-40 meV at different crystal orientations. The result of fitting shows that use of the computer program ISCANF allows one to predict the behaviour of the total cross section of an imperfect copper single crystal for the whole energy range. [References: 8]
机译：给出了一个半经验公式，该公式可以计算出不完美的单晶的总热截面，它是晶体常数，温度和中子能量E的函数，能量范围为3 meV至10 eV。该公式还包括寄生布拉格散射对总横截面的贡献，其中考虑了晶体镶嵌扩散值及其相对于中子束方向的取向。使用提出的公式，开发了计算机程序（ISCANF）来计算中子的总衰减。 ISCANF程序用于研究通过铜单晶的中子衰减。通过不完美的铜单晶的中子传输的计算值适合于在不同晶体取向的3-40 meV能量范围内的测量值。拟合的结果表明，使用计算机程序ISCANF可以预测不完整的铜单晶在整个能量范围内的总横截面行为。 [参考：8]

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