ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A novel experimental technique to observe the Bragg scattering of evanescent neutron waves is presented. The so-called EVA diffractometer, installed at the high-flux reactor of the Institut Laue-Langevin, allows the identification of neutron scattering from single crystal surfaces. We discuss the experimental setup, intensity, and resolution considerations and some first Bragg scattering signals from evanescent neutron waves excited at CaF2, InP, and MnF2 single crystal surfaces. The experimental results are discussed within the framework of the so-called distorted wave Born approximation and within a dynamical scattering theory. The limitations of both theoretical approaches to describe the Bragg scattering of evanescent neutron waves are indicated.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1143841
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