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首页> 外文期刊>Physical review, C >Scattering of ultracold neutrons from rough surfaces of metal foils
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Scattering of ultracold neutrons from rough surfaces of metal foils

机译：金属箔粗糙表面散射超薄中子

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The transparency of metal foils for ultracold neutrons (UCNs) plays an important role in the design of future high-density UCN sources, which will feed a number of fundamental physics experiments. In this work, we describe and discuss the measured transmission of a collimated beam of very slow neutrons (UCNs and very cold neutrons) through foils of Al, Cu, and Zr of various thicknesses at room temperature. Our goal was to separate scattering and absorption in the sample bulk from surface scattering, and to quantify the contribution of the surface. We were able to demonstrate that the surface roughness of these foils caused a significant fraction of UCN scattering. The surface roughness parameter b extracted from UCN measurements was shown to be of the same order of magnitude as the surface parameter determined by atomic-force microscopy. They lie in the order of several hundreds of angstroms. Using the formalism developed here, transmission data from previous neutron-optical experiments were re-analyzed and their surface roughness parameter b was extracted.
机译：超冷中子（UCN）金属箔的透明度在未来高密度UCN源的设计中起着重要作用，这将为许多基础物理实验提供支持。在这项工作中，我们描述并讨论了在室温下，非常慢的中子（UCN和非常冷的中子）准直光束通过不同厚度的Al、Cu和Zr箔的测量透射。我们的目标是将样品中的散射和吸收与表面散射分开，并量化表面的贡献。我们能够证明，这些箔的表面粗糙度导致了UCN散射的很大一部分。从UCN测量中提取的表面粗糙度参数b与原子力显微镜确定的表面参数具有相同的数量级。它们的大小约为几百埃。利用本文提出的形式主义，重新分析了以往中子光学实验的传输数据，并提取了它们的表面粗糙度参数b。

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