Göttingen 2012 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 64: Halbleiterdetektoren: Forschung und Entwicklung 2
T 64.8: Vortrag
Dienstag, 28. Februar 2012, 18:30–18:45, ZHG 001
Determination of the crystal axes in segmented germanium detectors — Iris Abt, Allen Caldwell, Bela Majorovits, and •Oleksandr Volynets — Max-Planck-Institut für Physik, München, Germany
High-purity germanium detectors are used in a variety of applications in particle and nuclear physics. For some applications, the shapes of the electric pulses collected on the electrodes are of interest. A comparison between measured and simulated pulses may reveal interesting intrinsic properties of the germanium detectors. However, the pulses are sensitive to detector parameters such as the position of the crystallographic axes. The ⟨001⟩ axis is usually aligned with the z axis of the detector, the position of the ⟨110⟩ and ⟨100⟩ axes are unknown upon delivery.
A new method to determine the crystallographic axes in an n-type φ-segmented germanium detector is presented. The method is based on comparing measured to simulated event rates in the segments. The full absorption peaks for gammas originating from 60Co or 228Th sources were used for the analysis presented here. The accuracy of this method is best for the symmetric case when the source is aligned with the geometrical axis of the crystal. However, good results are also obtained for other source positions, if the position is well known.