Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Poster (a)

HK 51.23: Poster

Thursday, April 2, 2020, 16:30–18:30, Zelt

Dead region correction of HPGe detectors in Geant4 — •Markus Müllenmeister, Jan Mayer, Philipp Scholz, and Andreas Zilges — Institute for Nuclear Physics, University of Cologne

Dead regions can develop in HPGe detectors over time. For the nearly 20 year old coaxial detectors of the SONIC@HORUS spectrometer [1], we assume that the efficiency loss can be modeled by a cylindrical inactive region around the inner contact, as the inner contact poses a greater chance of introducing defects into the detecting crystal volume.

Geant4 simulations with varying thickness of the inactive zone were conducted in G4Horus [2]. The differences from the calibration data were compared via the χ²-method.

It was found that the cylindrical inactive region reproduces experimental data very well. The changes for this adaptation of the detectors is minuscule and easy to implement in existing simulations. The inclusion of inactive regions should be considered for simulations of older detectors.

[1] S. G. Pickstone et al., Nucl. Instr. and Meth. A 875 (2017) 104

[2] J. Mayer, https://gitlab.ikp.uni-koeln.de/jmayer/g4horus