Frankfurt 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 44: Instrumentierung
HK 44.2: Vortrag
Donnerstag, 20. März 2014, 14:15–14:30, HZ 9
Pulse Shape Analysis Optimization with segmented HPGe-Detectors — •Lars Lewandowski1, Benedikt Birkenbach1, Bart Bruyneel2, and Peter Reiter1 for the AGATA collaboration — 1Institute for Nuclear Physics, University of Cologne — 2CEA, Saclay
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. Position resolution results were investigated by including contributions from differential crosstalk of the detector electronics, an improved preamplifier response function and a new time alignment. Moreover the spatial distribution is quantified by employing different χ2-minimization procedures. Supported by the German BMBF (05P12PKFNE TP4)