Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Instrumentation und Anwendungen

HK 8.1: Talk

Monday, March 12, 2007, 18:00–18:15, B

Performance and position sensitivity of the first AGATA detectors. — •Bart Bruyneel, Jürgen Eberth, Herbert Hess, Andreas Linnemann, Gheorghe Pascovici, Peter Reiter, and Andreas Wiens for the AGATA collaboration — Institut für Kernphysik, Universität zu Köln

The Advanced GAmma Tracking Array (AGATA) project is aiming to realize the first full 4π γ-ray spectrometer solely build 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. The first asymmetric Ge crystals performed excellent with efficiencies exceeding 80 % and crosstalk levels lower than 0.1 %. This crosstalk contribution can be explained as an inherent property of these detectors originating from a capacitive coupling between segments. Some crystals have been characterized for pulse shape analysis by collecting a database of position dependent pulse shapes. First in-beam tests of a prototype triple detector were performed and pulse shape analysis was successfully applied to demonstrate its position sensitivity.

*Supported by the German BMBF (06 K-167)