Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 63: Accelerators and Instrumentation II
HK 63.2: Group Report
Wednesday, March 18, 2009, 17:00–17:30, H-ZO 90
The new position sensitive triple cluster detector for AGATA — •P. Reiter1, B. Birkenbach1, B. Bruyneel1, J. Eberth1, H. Hess1, D. Lersch1, G. Pascovici1, A. Wiens1, and H.G. Thomas2 — 1IKP, University Cologne — 2CTT, Montabaur
The Advanced Gamma Tracking Array will be based on the novel principle of γ-ray tracking and will be built from encapsulated, 36-fold segmented HPGe detectors. Equipped with fully digital electronics, AGATA will provide an optimal energy resolution and a very high efficiency combined with a position sensitivity of a few millimetres. In its final configuration AGATA will consist of 60 detectors and the first triple cluster detectors are successfully assembled. All 111 energy channels are equipped with cold FETs for enhanced energy resolution. The energy range was extended up to 200 MeV by applying a time over threshold technique with new preamplifiers. Energy resolution for high energetic γ-rays above 8 MeV is measured to be comparable with values obtained with the standard technique. A very 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. The scanning results of AGATA crystals are reproduced by pulse shape simulations based on Ge crystal properties, electric field distributions and charge carrier mobility. The first triple cluster detectors are operated at INFN Legnaro and IKP Cologne for commissioning of the demonstrator sub-array. Supported by the German BMBF(06 KY205I)