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Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Instrumentation IV

HK 15.5: Talk

Monday, March 14, 2016, 17:45–18:00, S1/01 A2

Pulse Shape Analysis Optimization with segmented HPGe-Detectors — •Lars Lewandowski, Peter Reiter, and Benedikt Birkenbach for the AGATA collaboration — Institut für Kernphysik Universität zu Köln

Measurements with the position sensitive, highly segmented AGATA HPGe detectors rely on the gamma-ray-tracking GRT technique which allows to determine the interaction point of the individual gamma-rays hitting the detector. GRT is based on a pulse shape analysis PSA of the preamplifier signals from the 36 segments and the central electrode of the detector. The achieved performance and position resolution of the AGATA detector is well within the specifications. However, an unexpected inhomogeneous distribution of interaction points inside the detector volume is observed as a result of the PSA even when the measurement is performed with an isotropically radiating gamma ray source. The clustering of interaction points motivated a study in order to optimize the PSA algorithm or its ingredients. As a main result the impact of the transient signals of neigboring segments on the final PSA result was enhanced by introducing a weighting factor in the χ2 minimization. The final result shows a significant improvement of the angular resolution and PSA performance in general. Supported by the German BMBF (05P12PKFNE TP4)

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