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Neutron characteristics of single-crystal magnesium fluoride
Faculty
Science
Year:
2013
Type of Publication:
Article
Pages:
163-171
Authors:
Adib, M, Habib, N, Bashter, I, Morcos, H. N, Fathallah, M, El-Mesiry, M. S, Saleh, A
DOI:
10.1016/j.anucene.2013.04.024
Journal:
ANNALS OF NUCLEAR ENERGY PERGAMON-ELSEVIER SCIENCE LTD
Volume:
60
Research Area:
Nuclear Science \& Technology
ISSN
ISI:000322854700019
Keywords :
Single-crystal magnesium fluoride, Thermal neutron monochromator and filter
Abstract:
A simple formula is proposed that permits the calculation of both the neutron reflectivity and attenuation of single-crystal magnesium fluoride (MgF2) as a function of wavelength at both room temperature and 77 K. A computer program MgF2 written in FORTRAN-77, has been developed to carry out the required calculations for the single-crystal MgF2, when it is used as a neutron monochromator and/or filter. The monochromatic characteristics of single-crystal MgF2 are detailed in terms of the optimum crystal cutting plane, mosaic spread, thickness and reactor moderating temperature for efficient neutron reflectivity within the wavelength band from 0.1 nm up to.45 nm. Calculation shows that a 7 mm thick MgF2 single-crystal cut along (1 1 1) plane having 0.50 FWHM on mosaic spread has the optimum parameters when it is used as a monochromator at neutron wavelengths shorter than 0.2 nm. However, the integrated neutron intensity of 2nd and 3rd orders from a thermal reactor flux is even higher than that of the 1st order one at neutron wavelengths longer than 0.2 nm. While, from a cold reactor flux, the use of the single-crystal MgF2 (1 1 0) as a neutron monochromator free from higher order contaminations at lambda >= 0.38 nm is more appropriate. A feasibility study of using single-crystal MgF2 as a neutron filter is also detailed in terms of the optimum crystal orientation, mosaic spread, thickness and temperature for efficient transmission of thermalreactor neutrons. Calculation shows that a 100 mm thick MgF2 single-crystal cut along (1 1 0) plane cooled to liquid nitrogen temperature, with 0.05o FWHM on mosaic spread, is a good thermal neutron filter, with high effect-to-noise ratio. (C) 2013 Elsevier Ltd. All rights reserved.
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