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High resolution x-ray characterization of mosaic crystals for hard x- and gamma-ray astronomy (Contributo in atti di convegno)

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High resolution x-ray characterization of mosaic crystals for hard x- and gamma-ray astronomy (Contributo in atti di convegno) (literal)

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C. Ferrari, E. Buffagni, L. Marchini, A. Zappettini (2011)
High resolution x-ray characterization of mosaic crystals for hard x- and gamma-ray astronomy
in Conference on Optics for EUV, X-Ray, and Gamma-Ray Astronomy V/SPIE Optics + Photonics International Symposium on Optical Engineering + Applications, San Diego, CA, USA, August 21 - 25, 2011
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High resolution x-ray characterization of mosaic crystals for hard x- and gamma-ray astronomy (literal)

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Abstract

We have analyzed GaAs, Cu, CdTe, and CdZnTe crystals as possible optical elements for hard x-ray lenses for x-ray astronomy. We used high resolution x-ray diffraction at 8keV in Bragg geometry and Laue transmission diffraction at synchrotron at energies up to 500 keV. A good agreement was found between the mosaicity evaluated in Bragg diffraction geometry with x-ray penetration of the order of few tens micrometers and in Laue transmission geometry at synchrotron. All the analyzed crystals showed mosaicity values in a range between a few to 150 arcseconds and suitable for the application. Nevertheless -CdTe and CdZnTe crystals exhibit non-uniformity due to the presence of low angle grain boundaries; -Cu crystals exhibit mosaicity of the order of several arcminutes; they indeed suffer by a severe cutting damage that had to be removed with a very deep etching. The FWHM was also rapidly decreasing with the x-ray energy showing that the mosaic spread is not the only origin of peak broadening; -GaAs crystals grown by Czochralski method show mosaicity up to 30 arcseconds and good diffraction efficiency up to energies of 500 keV. The use of thermal treatments as a possible method to increase the mosaic spread is also evaluated. (literal)

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