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31 August 2009 High-Z crystals for gamma-ray optics
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In a Laue lens a large number of crystals are disposed on concentric rings such as they diffract via Braggdiffraction the incident gamma-rays onto a common focal spot. Compact structured high-Z mosaic-crystals are among the most efficient diffraction media for the domain of nuclear astrophysics (i.e. 300 keV ≤ E ≤ 1.5 MeV). We have studied the potential of various high-Z crystals such as Ir, W, Au, Ag, Pt, Rh and AsGa for a Laue lens application. The diffraction performance of gold, silver and platinum crystals have been measured during runs at the European Synchrotron Radiation Facility and in a reactor-beamline at the Institut Laue Langevin, Grenoble in France. Several of the tested high-Z materials show outstanding performances with reflectivities reaching the theoretical limits for mosaic-crystals, and hence open the way towards efficient focusing optics at MeV energies.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. Rousselle, P. von Ballmoos, N. Barrière, N. V. Abrosimov, P. Bastie, G. Bonnetto, T. Camus, P. Courtois, M. Jentschel, E. Lecomte, E. Rivière, and G. Roudil "High-Z crystals for gamma-ray optics", Proc. SPIE 7437, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IV, 74370L (31 August 2009);


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