Darmstadt 2008 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 4: Instrumentation und Anwendungen I
HK 4.1: Gruppenbericht
Montag, 10. März 2008, 14:00–14:30, 2C
Position sensitive γ-ray detection with AGATA — •Bart Bruyneel1, Benedikt Birkenbach1, Jürgen Eberth1, Herbert Hess1, Gheorghe Pascovici1, Peter Reiter1, Andreas Wiens1, Dino Bazzacco2, Alberto Pullia3, and Francesca Zocca3 for the AGATA collaboration — 1IKP, Universität zu Köln — 2INFN, Padova — 3INFN, Milano
The Advanced GAmma Tracking Array (AGATA) project is aiming to realize the first full 4π γ-ray spectrometer solely built out of Germanium. The 36-fold segmented encapsulated large volume HPGe detectors, equipped with fully digital electronics, will provide an optimal energy resolution and a very high efficiency combined with a position sensitivity of a few millimeters employing pulse shape analysis and the new method of γ-ray tracking. For the AGATA detector preamplifier circuitry a low cross talk level was determined which compares well with the expected calculated contributions. The results of a new correction method to eliminate the influence of cross talk will be presented. Several AGATA detector crystals have been characterized for pulse shape analysis by collecting a database of position dependent pulse shapes. The scanning results are reproduced by pulse shape simulations based on Ge crystal properties, electric field distributions and charge carrier mobilities. Recently the observable energy range of the AGATA preamps was extended up to 150 MeV by applying the time over threshold technique. Energy resolution for high energetic γ-rays is measured to be comparable with values obtained with the standard pulse height technique. *Supported by the German BMBF (06 K-167)