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• W2963655818 abstract "Highly oriented pyrolytic graphite (HOPG) has been widely used as monochromators, analyzers and filters at neutron and X-ray scattering facilities. In this Letter we report the first observation of an anomalous neutron Halo scattering of HOPG. The scattering projects a ring onto the detector with half cone angle of 12.4 degree that surprisingly persists to incident neutron wavelengths far beyond the Bragg cutoff for graphite (6.71 A). At longer wavelengths the ring is clearly a doublet with a splitting roughly proportional to wavelength. While the ring centers at the beam position if the beam is normal to the basal planes of HOPG, sample tilting results in the shift of the ring towards the same direction. The angle of ring shift is observed to be less than the sample tilts, which is wavelength dependent with longer wavelengths providing larger shifts. Additionally, upon tilting, the ring broadens and splits into a doublet at the low angle side with short wavelength neutrons whereas only subtle broadening is observed at longer wavelengths. The ring broadens and weakens with decreasing HOPG quality. We also notice that the intensity at the ring positions scales with the sample thickness. The ring vanishes as the sample is cooled down to 30 K, suggesting that the lattice dynamics of graphite is one of the factors that cause the scattering ring. A possible interpretation by combining inelastic scattering and Yoneda scattering is proposed." @default.
• W2963655818 created "2019-07-30" @default.
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• W2963655818 date "2017-04-10" @default.
• W2963655818 modified "2023-09-22" @default.
• W2963655818 title "Neutron Scattering Halo Observed in Highly Oriented Pyrolytic Graphite" @default.
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• W2963655818 hasPublicationYear "2017" @default.
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