Effect of surface roughness on the total reflexion and transmission of slow neutrons
Effect of surface roughness on the total reflexion and transmission of slow neutrons
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表面粗糙度对慢中子全反射和透射的影响
DOI：
10.1007/bf01380066
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发表时间：
1972
期刊：
影响因子：
--
通讯作者：
A. Steyerl
中科院分区：
文献类型：
--
作者：
A. Steyerl
亚热和热中子从粗糙表面的总反射进行了分析，在小的和大的粗糙度尺寸的限制相比，中子波长。分析表明，从一个亚微观粗糙表面的散射分布是由粗糙度的频谱，集中在附近的方向的规则反射和传输，除非表面的不规则性表现出长程相关。结果表明，亚微观表面粗糙度和宏观波度分别是超冷和热中子导向管中反射损失的主要来源。本文的理论解释了中子导管传输的实验值，还研究了冷中子和超冷中子通过厚度与中子波长相当或远大于中子波长的平板时，由于表面粗糙度引起的衍射。理论和实验表明，这种散射在超冷中子穿过具有大散射势的材料时是重要的。
The total reflexion of subthermal and thermal neutrons from rough surfaces is analyzed in the limits of small and large roughness dimensions as compared to the neutron wave length. The analysis shows that the scattering distribution from a submicroscopically rough surface is determined by the spectrum of the roughness, concentrating near the directions of regular reflexion and transmission unless the surface irregularities exhibit a long-range correlation. It is shown that submicroscopic surface roughness and macroscopic waviness are the primary sources of reflexion losses in guide tubes for ultracold and thermal neutrons, respectively. The present theory explains experimental values for neutron guide tube transmission.The diffraction due to surface roughness is also investigated for cold and ultracold neutron transmission through slabs whose thickness is comparable to or much larger than the neutron wave length. It is shown theoretically and experimentally that such scattering is significant in the ultracold neutron transmission through materials with large scattering potential.