M. M. Günther,
A. V. Volotka,
M. Jentschel,
S. Fritzsche,
T. Stöhlker,
P. G. Thirolf,
and M. Zepf
Dispersive refraction of different light to heavy materials at MeV γ-ray energies
Phys. Rev. A, 97 :063843 (June 2018)
Dispersive refraction of different light to heavy materials at MeV γ-ray energies
Phys. Rev. A, 97 :063843 (June 2018)
Abstract:
The dispersive behavior of materials with atomic charge numbers varying from Z=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.