Quasi-specular reflection of cold neutrons from nano-dispersed media at above-critical angles
Quasi-specular reflection of cold neutrons from nano-dispersed media at above-critical angles
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DOI：
10.1016/j.nima.2010.07.049
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发表时间：
2010-10-01
影响因子：
1.4
通讯作者：
Strelkov, A. V.
中科院分区：
文献类型：
--
作者：
Cubitt, R.;Lychagin, E. V.;Strelkov, A. V.
我们首次预言并观测到了冷中子在纳米分散介质中小入射角下的准镜面反射现象。这是由于中子从散射电势中的纳米尺寸的不均匀性的多次小角度散射。漫反射中子的反射角和角分布半宽近似等于入射角。对于所使用的金刚石纳米颗粒的粉末，在检测器角尺寸内的反射概率等于或接近30%，这对应于准镜面反射的总概率（λ/d 0）的40-50%。入射中子的切向速度分量比纯金刚石的临界速度大一个数量级。我们提供了一个潜在的应用所发现的现象增加冷中子通量的实验的例子。(C)2010 Elsevier B. V.保留所有权利。
We have predicted and observed for the first time a new phenomenon of quasi-specular reflection of cold neutrons at small incidence angles from nano-dispersed media. this is due to multiple small-angle scattering of neutrons from nano-sized inhomogeneities in the scattering potential. The reflection angle as well as the half-width of angular distribution of diffusively reflected neutrons is approximately equal to the incidence angle. For the powder of diamond nanoparticles used, the reflection probability was equal to similar to 30% within the detector angular size, which corresponds to 40-50% of total probability (albedo) of quasi-specular reflection. The tangential velocity component of incident neutrons was up to an order of magnitude larger than the critical velocity for pure diamond. We provide an example of potential application of the discovered phenomenon for increasing cold neutron fluxes available for experiments. (C) 2010 Elsevier B.V. All rights reserved.