Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 14: Poster Session: Instrumentation and Applications

HK 14.11: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

Investigation of Parametric X–Radiation under small Bragg angles at MAMI — •G. Kube, C. Ay, H. Backe, N. Clawiter, M. El Ghazaly, F. Hagenbuck, K.-H. Kaiser, W. Lauth, H. Mannweiler, H. Rochholz, and T. Weber — Institut für Kernphysik, Universität Mainz, J.-J. Becher Weg 45, 55099 Mainz

When a charged ultrarelativistic particle passes through a perfect crystal the particle field can be diffracted in the vicinity of the Bragg angle. The emitted radiation is called quasi–Čerenkov radiation or parametric X–radiation. The energy ℏω of the X–ray photons which are most efficiently radiated is predicted for silicon with plasma frequency ω_p = 31 eV/ ℏ and a Lorentz factor γ = 1672, as for the Mainz Microtron MAMI, to be ℏω = γ ℏω_p = 51.8 keV [1]. Angular distributions of (111), (333) and (444) reflections for silicon single crystals of various thicknesses between 100 and 500 µm have been investigated at MAMI for Bragg angles θ_B ≤ 5^∘. The measured intensity distributions will be compared with theoretical calculations.

[1] A. Caticha, Phys.Rev. B45 (1992) 9541

Work supported by the DFG under contract BA 1336/1-3