Mainz 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 105: Experimentelle Methoden der Astroteilchenphysik 4
T 105.6: Vortrag
Donnerstag, 27. März 2014, 18:00–18:15, P7
Position-Resolved Pulse-Shape Measurements in HPGe with CdZnTe detectors — •Oliver Schulz1 and Nuno Barros2 — 1Max-Planck-Institut f. Physik, München — 2Technische Universität Dresden
Many experiments based on high-purity germanium (HPGe) detectors rely on the characteristics of the detector charge or current pulse shapes during analysis. Especially low-background experiments, like double beta decay searches, depend on pulse shape analysis for background suppression. Precise knowledge of these pulse shapes, which depend on the position of the charge deposition inside the detector, is therefore essential. While the pulses can be simulated, position-resolved measurements of detector pulse shapes are necessary to verify and improve those simulations.
A well established technique for such measurements is based on 90∘ Compton-Scattering: The detector under study is illuminated using a mono-energetic γ-ray source (such as 137Cs) and detectors with slit collimators are placed at a 90∘ angle around the target detector. Usually, HPGe detectors are used to detect the Compton-scattered photons.
We present an approach to utilize z-sensitive CdZnTe detectors to achieve the same goal. Due to the nature of the detectors, less collimation and no cryogenic cooling are required, leading to a more efficient, less costly and easily portable setup.