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

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Journal article › Research › peer-review

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
Number of pages	7
ISSN	0168-9002
DOIs	https://doi.org/10.1016/j.nima.2020.164341
Publication status	Published - 2020

Keywords

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

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

year = "2020",

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

language = "English",

volume = "977",

journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

issn = "0168-9002",

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}

Characterization of pyrolytic graphite with cold neutrons. / Toft-Petersen, Rasmus; Georgii, Robert; Schneider, Michael et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 977, 164341, 2020.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

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

Y1 - 2020

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 - TAS

KW - Multiplexing

KW - Neutron spectroscopy

KW - Inelastic neutron scattering methods

KW - TAS spectroscopy

U2 - 10.1016/j.nima.2020.164341

DO - 10.1016/j.nima.2020.164341

M3 - Journal article

SN - 0168-9002

VL - 977

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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