<i>nxs</i>: a program library for neutron cross section calculations

Boin, Mirko

doi:10.1107/s0021889812016056

Cited by 61 publications

(48 citation statements)

References 18 publications

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“…Table 5 contains the scattering and absorption cross sections, averaged and weighted attenuation coefficients as function of monitor position. Figure 14 shows calculated attenuation coefficient for these four materials using the NXS program [28].…”

Section: Proofs Jinst_003p_0713mentioning

confidence: 99%

Modelling of an imaging beamline at the ISIS pulsed neutron source

Burca¹,

Kockelmann²,

James³

et al. 2013

J. Inst.

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A combined neutron imaging and neutron diffraction facility, IMAT, is currently being built at the pulsed neutron spallation source ISIS in the U.K. A supermirror neutron guide is required to combine imaging and diffraction modes at the sample position in order to obtain suitable time of flight resolutions for energy selective imaging and diffraction experiments. IMAT will make use of a straight neutron guide and we consider here the optimization of the supermirror guide dimensions and characterisation of the resulting beam characteristics, including the homogeneity of the flux distribution in space and energy and the average and peak neutron fluxes. These investigations take into account some main design criteria: to maximise the neutron flux, to minimise geometrical artefacts in the open beam image at the sample position and to obtain a good energy resolution whilst retaining a large neutron bandwidth. All of these are desirable beam characteristics for the proposed imaging and diffraction analysis modes of IMAT.

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Section: Proofs Jinst_003p_0713mentioning

confidence: 99%

Modelling of an imaging beamline at the ISIS pulsed neutron source

Burca¹,

Kockelmann²,

James³

et al. 2013

J. Inst.

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“…The present discussion will restrict itself to σ el coh and the new developments needed in nxs for NXSG4, and refer to [3] for further details. Magnetic neutron-matter interaction is not handled in the nxs library.…”

Section: Implementation Of Cross Section Calculationsmentioning

confidence: 99%

“…Based on usersupplied crystal structures and the nxs library [3][4][5][6], cross sections are calculated and applied for coherent and incoherent neutron scattering in materials with randomly oriented crystal grains (i.e. a perfect powder or polycrystal with no texture or preferred directions).…”

Section: Introductionmentioning

confidence: 99%

Polycrystalline neutron scattering for Geant4: NXSG4

Kittelmann

Boin

2015

Computer Physics Communications

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“…These models were adopted in the CRIPO code [17] and the BETMAn code [18], which were pioneer codes before the RITS code and also in the NXS code [19] which was a calculation code developed in 2012.…”

Section: Neutron Transmission and Total Cross-sectionmentioning

confidence: 99%

Deriving Quantitative Crystallographic Information from the Wavelength-Resolved Neutron Transmission Analysis Performed in Imaging Mode

Sato

2017

J. Imaging

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Current status of Bragg-edge/dip neutron transmission analysis/imaging methods is presented. The method can visualize real-space distributions of bulk crystallographic information in a crystalline material over a large area (~10 cm) with high spatial resolution (~100 µm). Furthermore, by using suitable spectrum analysis methods for wavelength-dependent neutron transmission data, quantitative visualization of the crystallographic information can be achieved. For example, crystallographic texture imaging, crystallite size imaging and crystalline phase imaging with texture/extinction corrections are carried out by the Rietveld-type (wide wavelength bandwidth) profile fitting analysis code, RITS (Rietveld Imaging of Transmission Spectra). By using the single Bragg-edge analysis mode of RITS, evaluations of crystal lattice plane spacing (d-spacing) relating to macro-strain and d-spacing distribution's FWHM (full width at half maximum) relating to micro-strain can be achieved. Macro-strain tomography is performed by a new conceptual CT (computed tomography) image reconstruction algorithm, the tensor CT method. Crystalline grains and their orientations are visualized by a fast determination method of grain orientation for Bragg-dip neutron transmission spectrum. In this paper, these imaging examples with the spectrum analysis methods and the reliabilities evaluated by optical/electron microscope and X-ray/neutron diffraction, are presented. In addition, the status at compact accelerator driven pulsed neutron sources is also presented.

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nxs: a program library for neutron cross section calculations

Cited by 61 publications

References 18 publications

Modelling of an imaging beamline at the ISIS pulsed neutron source

Modelling of an imaging beamline at the ISIS pulsed neutron source

Polycrystalline neutron scattering for Geant4: NXSG4

Deriving Quantitative Crystallographic Information from the Wavelength-Resolved Neutron Transmission Analysis Performed in Imaging Mode

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