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First studies of event discrimination with a Broad-Energy Germanium (BEGe)detector are presented. A novel pulse shape method, exploiting thecharacteristic electrical field distribution inside BEGe detectors, allows toidentify efficiently single-site events and to reject multi-site events. Thefirst are typical for neutrinoless double beta decays (0-nu-2-beta) and thelatter for backgrounds from gamma-ray interactions. The obtained survivalprobabilities of backgrounds at energies close to Q(76Ge) = 2039 keV are 0.93%for events from 60Co, 21% from 226Ra and 40% from 228Th. This backgroundsuppression is achieved with 89% acceptance of 228Th double escape events,which are dominated by single site interactions. Approximately equal acceptanceis expected for 0-nu-2-beta-decay events. Collimated beam and Comptoncoincidence measurements demonstrate that the discrimination is largelyindependent of the interaction location inside the crystal and validate thepulse-shape cut in the energy range of Q(76Ge). The application of BEGedetectors in the GERDA and the Majorana double beta decay experiments is understudy.

journal of instrumentation

Pulse shape discrimination studies with a Broad-Energy Germanium  detector for signal identification and background suppression in the GERDA  double beta decay experiment