Diffuse reflection of ultracold neutrons from low-roughness surfaces

作者：Atchison F^*; Daum M; Henneck R; Heule S; Hori**erger M; Kasprzak M; Kirch K; Knecht A; Kuzniak M; Lauss B; Mtchedlishvili A; Meier M; Petzoldt G; Plonka Spehr C; Schelldorfer R; Straumann U; Zsigmond G

来源：European Physical Journal A, 2010, 44(1): 23-29.

DOI：10.1140/epja/i2010-10926-x

We report a measurement of the reflection of ultracold neutrons from flat, large-area plates of different Fermi potential materials with low surface roughness. The results were used to test two diffuse reflection models, the well-known Lambert model and the micro-roughness model which is based on wave scattering. The Lambert model fails to reproduce the diffuse reflection data. The surface roughness b and correlation length w, obtained by fitting the micro-roughness model to the data are in the range 1 <= b <= 3 nm and 10 <= w <= 120 nm, in qualitative agreement with independent measurements using atomic force microscopy.

• 出版日期2010-4