High-Z crystals for gamma-ray optics

J. Rousselle; P. von Ballmoos; N. Barrière; N. V. Abrosimov; P. Bastie; G. Bonnetto; T. Camus; P. Courtois; M. Jentschel; E. Lecomte; E. Rivière; G. Roudil

doi:10.1117/12.825245

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31 August 2009 High-Z crystals for gamma-ray optics

J. Rousselle, P. von Ballmoos, N. Barrière, N. V. Abrosimov, P. Bastie, G. Bonnetto, T. Camus, P. Courtois, M. Jentschel, E. Lecomte, E. Rivière, G. Roudil

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Proceedings Volume 7437, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IV; 74370L (2009) https://doi.org/10.1117/12.825245
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

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.

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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); https://doi.org/10.1117/12.825245

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