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Development of spin‐echo small‐angle neutron scattering
Author(s) -
Bouwman W. G.,
Van Oossanen M.,
Uca O.,
Kraan W.H.,
Rekveldt M.T.
Publication year - 2000
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/s0021889800099829
Subject(s) - neutron spin echo , precession , physics , neutron scattering , neutron , small angle neutron scattering , spin (aerodynamics) , spin echo , larmor precession , scattering , optics , nuclear magnetic resonance , magnetic field , computational physics , nuclear physics , condensed matter physics , magnetic resonance imaging , medicine , radiology , quantum mechanics , thermodynamics
A polarised neutron spin echo technique is used to build a novel kind of small angle neutron scattering (SANS) instrument. The basis of this instrument is a symmetric set‐up with a spin flipper in the centre, which creates a spin echo, even with a divergent beam. The precession regions on either side of the spin flipper are shaped such as to produce a very sensitive relation between the vertical angle of the neutron path and the total precession angle. Any SANS of a sample placed in the instrument reduces the symmetry of the neutron path and therefore decreases the echo. Magnetised foils define the precession regions by rotating the neutron spin from being parallel to the magnetic field to perpendicular to the field, to start the precession. These foils and the flipper were built and tested. A spin echo SANS signal is measured with the complete set‐up . It should be possible with this technique to measure within minutes a full correlation function in samples over distances from 5 to 1000 nm.