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Tunneling reflection with polarized slow neutrons: polarized‐neutron total frustrated reflection
Author(s) -
Mâaza M.,
Pardo B.,
Bridou F.
Publication year - 1993
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s002188989201032x
Subject(s) - neutron , reflection (computer programming) , quantum tunnelling , monochromatic color , polarization (electrochemistry) , ultracold neutrons , optics , total internal reflection , physics , scattering , condensed matter physics , atomic physics , nuclear physics , chemistry , computer science , programming language
This work describes the conditions required to observe the tunneling phenomenon in the grazing‐angle reflection configuration of both polarized and unpolarized monochromatic neutron waves. According to the computed results, this neutron‐tunneling phenomenon manifests itself by the existence of sharp resonances in the total reflection plateau. Their angular positions depend on the polarization state of the incident neutron waves. We treat the case where all these tunneling resonances (high and low orders) in the total‐reflection plateau are observed. This can be achieved by using a Fabry–Perot cavity deposited onto an appropriate substrate. The substrate must be nonmagnetic, having a negative nuclear scattering‐length density. The numbers of these resonances change mainly with the thickness of the spacer layer of the Fabry–Perot cavity, while their bandwidths are linked to the thicknesses of the reflecting layers.