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Spin-echo small-angle neutron scattering is used to measure the average density of a charge-stabilized colloidal silica suspension confined in an array of channels whose width is a few times the particle diameter. The particle density in the channels is almost twice that in the neighboring colloidal fluid and is consistent with the particles organizing in close-packed sheets parallel to the channel walls.

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A neutron spin echo spectrometer based on neutron magnetic Wollaston prisms is introduced to measure the linewidth of dispersive phonon excitations over the entire Brillouin zone with µeV resolution. By tuning the instrument electromagnetically, the linewidths of phonon excitations with high energy and large group velocity can be measured.
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