Abstract
Neutron transmission and γ-diffraction measurements at a large single crystal of Al 2O 3 of high optical quality have been performed at room temperature in order to determine the filter efficiency against fast neutrons. Measurements were done with thermal neutrons at energies of 14.5, 34.1, 57.8 and 134 meV. The maximum transmission rate was 0.84 for thermal neutrons, and 0.07 for epithermal neutrobs (crystal length 90 mm). The orientation of the crystal relative to the beam did not influence the transmission rate. γ-ray diffractometry yielded mosaic angles between 3 and 30 seconds of arc and provided information on variations of the crystal perfection across the sample.
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