publication . Article . 2018

Diffuse reflection of ultracold neutrons from low-roughness surfaces

Atchison, F.; Daum, M.; Henneck, R.; Heule, S.; Horisberger, M.; Kasprzak, M.; Kirch, K.; Knecht, A.; Kużniak, M.; Lauss, B.; ...
Open Access English
  • Published: 18 Jun 2018
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$ \le$ b $ \le$3 nm and 10$ \le$ w $ \le$120 nm, in qualitative agreement with independent measurements using atomic force microscopy
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