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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Instrumentation V

HK 29.1: Gruppenbericht

Mittwoch, 1. April 2020, 14:00–14:30, J-HS C

Pulse-Shape Analysis and Position Resolution in Highly Segmented HPGe Detectors — •Lars Lewandowski, Peter Reiter, Jürgen Eberth, Herbert Hess, and Rouven Hirsch for the AGATA collaboration — Institut für Kernphysik, Köln

The performance of the Pulse-Shape Analysis (PSA) in AGATA HPGe detectors was investigated and improved employing a γ-ray source measurement based on e⁺e⁻ annihilation radiation after decays of ²²Na by β⁺ decay. The first interaction positions of the two 511 keV γ rays were determined and the connecting line of these two positions was compared to the known source position as a measure for the PSA performance. The position resolution and its dependence on the PSA parameters were investigated by varying most relevant input quantities: the charge carrier mobility of the holes, the response of the employed measuring electronics especially the preamplifier rise time. The relative statistical weight of charge signals and transient signals was scrutinized. The optimal distance metric of the grid-search algorithm and its impact on the position resolution was determined.