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Günther, M. M.; Volotka, A. V.; Jentschel, M.; Fritzsche, S.; Stoehlker, Th.; Thirolf, P. G.; Zepf, M. (2018): Dispersive refraction of different light to heavy materials at MeV gamma-ray energies. In: Physical Review A, Vol. 97, No. 6, 63843
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Abstract

The dispersive behavior ofmaterials with atomic charge numbers varying fromZ = 4 (beryllium, Be) to Z = 82 (lead, Pb) was investigated experimentally and theoretically at gamma-ray energies up to 2 MeV. The experiment was performed at the double-crystal gamma spectrometer GAMS6 of the Institut Laue-Langevin in Grenoble. The experimental results were compared with theoretical calculations which account for all major elastic processes involved. Overall, we found a good agreement between theory and experiment. We find that, for the development of refractive optics at gamma-ray energies beyond those currently in use, high-Z materials become increasingly attractive compared to the beryllium lens-stacks used at x-ray energies.