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Title: Single crystal to polycrystal neutron transmission simulation

Abstract

A collection of routines for calculation of the total cross section that determines the attenuation of neutrons by crystalline solids is presented. The total cross section is calculated semi-empirically as a function of crystal structure, neutron energy, temperature, and crystal orientation. The semi-empirical formula includes the contribution of parasitic Bragg scattering to the total cross section using both the crystal’s mosaic spread value and its orientation with respect to the neutron beam direction as parameters. These routines allow users to enter a distribution of crystal orientations for calculation of total cross sections of user defined powder or pseudo powder distributions, which enables simulation of non-uniformities such as texture and strain. In conclusion, the spectra for neutron transmission simulations in the neutron thermal energy range (2 meV–100 meV) are presented for single crystal and polycrystal samples and compared to measurements.

Authors:
 [1];  [2];  [2]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physcis; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Office (EE-4G)
OSTI Identifier:
1423074
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 2; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Polycrystals; Particle beams; Crystal orientation; Crystal optics; Neutron physics

Citation Formats

Dessieux, Luc Lucius, Stoica, Alexandru Dan, and Bingham, Philip R. Single crystal to polycrystal neutron transmission simulation. United States: N. p., 2018. Web. doi:10.1063/1.5002102.
Dessieux, Luc Lucius, Stoica, Alexandru Dan, & Bingham, Philip R. Single crystal to polycrystal neutron transmission simulation. United States. doi:10.1063/1.5002102.
Dessieux, Luc Lucius, Stoica, Alexandru Dan, and Bingham, Philip R. Fri . "Single crystal to polycrystal neutron transmission simulation". United States. doi:10.1063/1.5002102. https://www.osti.gov/servlets/purl/1423074.
@article{osti_1423074,
title = {Single crystal to polycrystal neutron transmission simulation},
author = {Dessieux, Luc Lucius and Stoica, Alexandru Dan and Bingham, Philip R.},
abstractNote = {A collection of routines for calculation of the total cross section that determines the attenuation of neutrons by crystalline solids is presented. The total cross section is calculated semi-empirically as a function of crystal structure, neutron energy, temperature, and crystal orientation. The semi-empirical formula includes the contribution of parasitic Bragg scattering to the total cross section using both the crystal’s mosaic spread value and its orientation with respect to the neutron beam direction as parameters. These routines allow users to enter a distribution of crystal orientations for calculation of total cross sections of user defined powder or pseudo powder distributions, which enables simulation of non-uniformities such as texture and strain. In conclusion, the spectra for neutron transmission simulations in the neutron thermal energy range (2 meV–100 meV) are presented for single crystal and polycrystal samples and compared to measurements.},
doi = {10.1063/1.5002102},
journal = {Review of Scientific Instruments},
number = 2,
volume = 89,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: Each grain cross section is calculated, a distribution of grains is aggregated to form voxel cross-section , with voxel cross sections a sample can be simulated.

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