Characterization of pyrolytic graphite with cold neutrons

Rasmus Toft-Petersen; Robert Georgii; Michael Schneider; Naomi Nishiki; Peter Böni

doi:10.1016/j.nima.2020.164341

Characterization of pyrolytic graphite with cold neutrons

Rasmus Toft-Petersen, Robert Georgii, Michael Schneider, Naomi Nishiki, Peter Böni

Natural Sciences

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4 Scopus citations

Abstract

We present a thorough investigation of the diffuse scattering of neutrons from Highly Oriented Pyrolytic Graphite (HOPG) that appears in the tails of the (002) Bragg scattering profile. Using a low background neutron diffraction setup, the elastic diffuse scattering is shown to be a factor of 10⁴−10⁷ weaker than the peak intensity of the (002) Bragg reflection. Evidence of inelastic scattering due to phonons is observed, 10⁵ times weaker than the Bragg peak. Our results demonstrate the possibility of using HOPG in complex multiplexing geometries to improve the performance of spectrometers involving multi-analyzer back-end systems, and can be helpful in designing such systems for optimal performance.

Original language	English
Article number	164341
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	977
DOIs	https://doi.org/10.1016/j.nima.2020.164341
State	Published - 11 Oct 2020

Keywords

Inelastic neutron scattering methods
Multiplexing
Neutron spectroscopy
TAS
TAS spectroscopy

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title = "Characterization of pyrolytic graphite with cold neutrons",

abstract = "We present a thorough investigation of the diffuse scattering of neutrons from Highly Oriented Pyrolytic Graphite (HOPG) that appears in the tails of the (002) Bragg scattering profile. Using a low background neutron diffraction setup, the elastic diffuse scattering is shown to be a factor of 104−107 weaker than the peak intensity of the (002) Bragg reflection. Evidence of inelastic scattering due to phonons is observed, 105 times weaker than the Bragg peak. Our results demonstrate the possibility of using HOPG in complex multiplexing geometries to improve the performance of spectrometers involving multi-analyzer back-end systems, and can be helpful in designing such systems for optimal performance.",

keywords = "Inelastic neutron scattering methods, Multiplexing, Neutron spectroscopy, TAS, TAS spectroscopy",

author = "Rasmus Toft-Petersen and Robert Georgii and Michael Schneider and Naomi Nishiki and Peter B{\"o}ni",

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doi = "10.1016/j.nima.2020.164341",

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T1 - Characterization of pyrolytic graphite with cold neutrons

AU - Toft-Petersen, Rasmus

AU - Georgii, Robert

AU - Schneider, Michael

AU - Nishiki, Naomi

AU - Böni, Peter

PY - 2020/10/11

Y1 - 2020/10/11

N2 - We present a thorough investigation of the diffuse scattering of neutrons from Highly Oriented Pyrolytic Graphite (HOPG) that appears in the tails of the (002) Bragg scattering profile. Using a low background neutron diffraction setup, the elastic diffuse scattering is shown to be a factor of 104−107 weaker than the peak intensity of the (002) Bragg reflection. Evidence of inelastic scattering due to phonons is observed, 105 times weaker than the Bragg peak. Our results demonstrate the possibility of using HOPG in complex multiplexing geometries to improve the performance of spectrometers involving multi-analyzer back-end systems, and can be helpful in designing such systems for optimal performance.

AB - We present a thorough investigation of the diffuse scattering of neutrons from Highly Oriented Pyrolytic Graphite (HOPG) that appears in the tails of the (002) Bragg scattering profile. Using a low background neutron diffraction setup, the elastic diffuse scattering is shown to be a factor of 104−107 weaker than the peak intensity of the (002) Bragg reflection. Evidence of inelastic scattering due to phonons is observed, 105 times weaker than the Bragg peak. Our results demonstrate the possibility of using HOPG in complex multiplexing geometries to improve the performance of spectrometers involving multi-analyzer back-end systems, and can be helpful in designing such systems for optimal performance.

KW - Inelastic neutron scattering methods

KW - Multiplexing

KW - Neutron spectroscopy

KW - TAS

KW - TAS spectroscopy

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JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

M1 - 164341

ER -

Characterization of pyrolytic graphite with cold neutrons

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