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Original title:
Development of Segmented Germanium Detectors for Neutrinoless Double Beta Decay Experiments 
Translated title:
Entwicklung von segmentierten Germanium-Detektoren für neutrinolosen Doppelbetazerfall 
Document type:
Fakultät für Physik 
Caldwell, Allen (Prof., Ph.D.) 
Ibarra, Alejandro (Prof. Dr.) 
Subject group:
PHY Physik 
The GERmanium Detector Array (GERDA) experiment, which will search for the neutrinoless double beta decay of 76Ge, is currently under construction in Hall A of the INFN Gran Sasso National Laboratory, Italy. In order to achieve an extremely low background level, segmented germanium detectors are considered to be operated directly in liquid argon which serves simultaneously as cooling and shielding medium.
Several test cryostats were built at the Max-Planck-Institut fuer Physik to operate segmented germanium detectors both in vacuum and submerged in cryogenic liquid. The performance and the background discrimination power of segmented germanium detectors were studied in detail. It was proven for the first time that segmented germanium detectors can be operated stably over long periods submerged in a cryogenic liquid. It was confirmed that the segmentation scheme employed does well in the identification of photon induced background and demonstrated for the first time that also neutron interactions can be identified.
Pulse shape analysis is complementary to segmentation in identifying background events. Its efficiency can only be correctly determined using reliable pulse shape simulations. A fully functional pulse shape simulation package was developed to augment the MaGe package. The simulation was verified using data taken with the first segmented prototype detector for GERDA. This work also led to a considerable improvement in the understanding of segmented germanium detectors. 
Translated abstract:
Das GERmanium Detector Array (GERDA) für die Suche nach neutrinolosem Doppelbetazerfall von 76Ge wird derzeit in der Halle A des INFN Gran Sasso National Laboratory in Italien aufgebaut. Um ein extrem niedriges Untergrundniveau zu ereichen, werden segmentierte Germaniumdetektoren direkt in flüssigem Argon, das gleichzeitig als Kühl- und Abschirmmedium dient, betrieben.
Mehrere Testkryostaten wurden für den Betrieb segmentierter Germaniumdetektoren in Vakuum und kryogener Flüssigkeit am Max...    »
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