Neutron Scattering Instrumentation

Schober, H.

doi:10.1007/978-0-387-09416-8_3

Cited by 9 publications

(1 citation statement)

References 44 publications

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“…For broad spectrum pulsed neutron sources, frame overlap can result in ambiguous TOF signals where fast neutrons from a given pulse have the same observable TOF as slower neutrons from previous pulses. As a result, neutron TOF experiments with pulsed sources have traditionally been limited by the duty cycle of the source [11,12].…”

Section: Introductionmentioning

confidence: 99%

Neutron Spectroscopy for pulsed beams with frame overlap using a double time-of-flight technique

Harrig¹,

Goldblum²,

Brown³

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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A new double time-of-flight (dTOF) neutron spectroscopy technique has been developed for pulsed broad spectrum sources with a duty cycle that results in frame overlap, where fast neutrons from a given pulse overtake slower neutrons from previous pulses. Using a tunable beam at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory, neutrons were produced via thick-target breakup of 16 MeV deuterons on a beryllium target in the cyclotron vault. The breakup spectral shape was deduced from a dTOF measurement using an array of EJ-309 organic liquid scintillators. Simulation of the neutron detection efficiency of the scintillator array was performed using both GEANT4 and MCNP6. The efficiencycorrected spectral shape was normalized using a foil activation technique to obtain the energy-dependent flux of the neutron beam at zero degrees with respect to the incoming deuteron beam. The dTOF neutron spectrum was compared to spectra obtained using HEPROW and GRAVEL pulse height spectrum unfolding techniques. While the unfolding and dTOF results exhibit some discrepancies in shape, the integrated flux values agree within two standard deviations. This method obviates neutron time-of-flight spectroscopy challenges posed by pulsed beams with frame overlap and opens new opportunities for pulsed white neutron source facilities.

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Section: Introductionmentioning

confidence: 99%

Neutron Spectroscopy for pulsed beams with frame overlap using a double time-of-flight technique

Harrig¹,

Goldblum²,

Brown³

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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Vibrational Spectroscopy

Eckold

Schober

2017

Handbook of Solid State Chemistry

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This chapter concentrates on the study of structural excitations in fully relaxed crystalline materials where the atoms vibrate about well‐defined equilibrium positions. It illustrates the power of neutron spectroscopy using selected examples of crystalline materials. The chapter briefly introduces the concept of phonons in the harmonic approximation. It also shows how neutron powder spectroscopy can contribute important information on the dynamics of molecular crystals. The chapter covers a broad range of applications of vibrational spectroscopy using different techniques with special emphasis on neutron scattering. There are a variety of different experimental techniques that are frequently used for optical spectroscopy or inelastic neutron and X‐ray scattering. In most cases it is the competition between high intensity and high resolution that determines the most appropriate method. Infrared (IR) spectroscopy is a technique that is frequently used in chemistry since it allows the assignment of individual modes as fingerprints of specific bonds within molecular or functional groups.

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Neutronen für die Analyse von Wasserstoff in Festkörpern

Foest

Schmidt²,

Kruth³

et al. 2018

Vak Forsch Prax

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Summary Neutrons for the analysis of hydrogen in solids Recent advancement of renewable energy applications lead to increased focus in materials and surface science on hydrogen technologies. Neutron‐based analytical methods are wellsuited to detect structural sites and dynamics of hydrogen in solids. Because of its large incoherent scattering cross‐section, very small quantities of hydrogen are detectable. This article gives an overview over fundamental aspects of neutron methods and discusses some selected examples of analysis techniques. Results of structural investigations, for kinetics observed by quasielastic scattering as well as decomposition mechanisms investigated by non‐elastic scattering are shown for alanates, as important materials for hydrogen storage. Furthermore, small angle diffraction studies of the mesoscopic structure of polymer membranes and of electrodes for fuel cells are presented. Finally, observations of geometric changes in thin metal oxide layers due to incorporation of hydrogen by neutron reflectometry are described.

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Neutron Scattering Instrumentation

Cited by 9 publications

References 44 publications

Neutron Spectroscopy for pulsed beams with frame overlap using a double time-of-flight technique

Neutron Spectroscopy for pulsed beams with frame overlap using a double time-of-flight technique

Vibrational Spectroscopy

Neutronen für die Analyse von Wasserstoff in Festkörpern

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