MgO single-crystal as an efficient thermal neutron filter |
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Authors: | M. Adib N. Habib I. Bashter M. Fathallah A. Saleh |
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Affiliation: | 1. Reactor Physics Department, NRC, AEAE, Cairo, Egypt;2. Faculty of Science, Zagazig University, Egypt;3. Faculty of Education, Ain Shams University, Egypt |
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Abstract: | A formula is given which, for neutron energies in the range 10−4 < E < 10 eV, permits calculation of the nuclear capture, thermal diffuse and Bragg scattering cross-sections as a function of magnesium oxide (MgO) temperature and crystal parameters. Computer program has been developed to calculate the total neutron cross-section and transmission through mono-crystalline MgO. The calculated neutron transmission and effective attenuation coefficient values for MgO-single crystal at different temperatures are compared with measured ones. An overall agreement is indicated between the formula fits and experimental data. A feasibility study for the use of MgO-single crystal is discussed in terms of the optimum MgO-single crystal thickness, mosaic spread, temperature and cutting plane for efficient transmission of thermal-reactor neutrons, and also for rejection of the accompanying fast neutrons and gamma rays. |
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Keywords: | Neutron transmission MgO Neutron filters |
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