Experimental study demonstrates superior filtering by cooled sapphire and beryllium assemblies, indicating effective removal of fast neutrons from thermal beams.
Transmission measurements have been made at 80 and 300 K for sapphire and beryllium filters in service on a triple-axis neutron spectrometer. The measurements agree with earlier work and confirm that sapphire is a more effective neutron filter than either quartz or silicon. Curves of transmission as a function of neutron wavelength are presented in a form useful for planning thermal neutron experiments in which higher-order thermal neutrons and fast neutrons must be removed from the incident beam.
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D. C. Tennant (1988) studied this question.
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