Figure 6: Transmission image, spectra of samples N2 and N3, and diffraction image of sample N2.

(a) The transmission image and (b) forward diffraction spot from sample N2 measured simultaneously. Incoming neutron flux was limited to the dashed rectangle shown in (a); all neutrons in image (b) were diffracted by sample N2. (c) Thermal transmission spectra measured for samples N2 and N3 (integrated over the entire sample area excluding edges). (d) Diffraction pattern of the neutron diffraction spot from sample N2. The dips in spectra (c) of sample N2 and peaks in (d) indicate that sample N2 is a single crystal, while sample N3 exhibits a polycrystalline transmission spectrum (c).