Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 43: Instrumentation XIV

HK 43.3: Vortrag

Mittwoch, 28. Februar 2018, 17:00–17:15, HZO 90

Impact of Hole Mobility on Simulated Pulse Shapes in Highly Segmented HPGe Detectors — •Lars Lewandowski, Peter Reiter, Herbert Hess, Jürgen Eberth, Bart Bruyneel, and Benedikt Birkenbach for the AGATA collaboration — Institut für Kernphysik, Köln

The AGATA spectrometer is a γ-ray tracking array consisting of 36 fold segmented high purity germanium detectors. In contrast to conventional γ-ray spectrometers, AGATA relies on the γ-ray tracking method which reconstructs the path of a γ ray through the array. The tracking needs the interaction positions of the individual γ rays within the segments. These are obtained via pulse-shape analysis (PSA) of the 37 preamplifier signals. The measured signals are compared with simulations to obtain the interaction position. The drift velocity of the holes is crucial for these simulations. An essential ingredient for the velocity calculation is the hole mobility in germanium. The hole mobility that yields the best results was obtained empirically by maximizing the accuracy of the found interaction positions. As a complementary approach the difference in the time evolution of the of measured and simulated pulses was investigated, which is a crucial observable to determine correct drift velocities.