EURONS Town Meeting 2008
September 17 - 19, 2008 -
Information

Title:	Dr.
Family Name:	Bruyneel
First Name:	Bart
Gender:	male
E-Mail:	bart.bruyneelikp.uni-koeln.de
Affiliation for Badge:	Universität Köln
Institute:	Institut fuer Kernphysik
Address (Street):	Zuelpicherstr 77
Postal Code, City:	50937
Country:	Germany
Phone:	++49 (0) 221 470 3620
Fax:
Young researcher with contribution:	Yes
Arrival Date:	September 16
Departure Date:	September 20
Author(s):	B. Bruyneel, J. Eberth, H. Hess, G. Pascovici, P. Reiter, N. Warr, A. Wiens and H.G. Thomas
Institute(s):	Institut für Kernphysik, Universität zu Köln and CTT, Montabaur, Germany
Title:	The new position sensitive triple cluster detector for the Advanced GAmma Tracking Array
Abstract:	AGATA is the next generation high-resolution gamma ray spectrometer for nuclear structure studies based on the novel principle of gamma-ray tracking. AGATA will be built from encapsulated, 36-fold segmented HPGe detectors. Equipped with fully digital electronics, this array 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 clusters, each cluster comprising three HPGe detectors. As such, it will surmount the sensitivity of current HPGe spectrometers by several orders of magnitude. Recently the first AGATA triple cluster detector was 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 the newly developed AGATA preamplifiers. Energy resolution for high energetic gamma rays above 8 MeV is measured to be comparable with values obtained with the standard pulse height technique. 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 mobility. Supported by the German BMBF(06 K-167)

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