Pulse shape discrimination studies with a Broad-Energy Germanium detector for signal identification and background suppression in the GERDA double beta decay experiment
2009; Institute of Physics; Volume: 4; Issue: 10 Linguagem: Inglês
10.1088/1748-0221/4/10/p10007
ISSN1748-0221
AutoresD. Budjáš, Marik Barnabé Heider, O. Chkvorets, N. D. Khanbekov, S. Schönert,
Tópico(s)Radiation Detection and Scintillator Technologies
ResumoFirst studies of event discrimination with a Broad-Energy Germanium (BEGe) detector are presented. A novel pulse shape method, exploiting the characteristic electrical field distribution inside BEGe detectors, allows to identify efficiently single-site events and to reject multi-site events. The first are typical for neutrinoless double beta decays (0νββ) and the latter for backgrounds from gamma-ray interactions. The obtained survival probabilities of backgrounds at energies close to Qββ(76Ge) = 2039 keV are (0.93 ± 0.08)% for events from 60Co, (21 ± 3)% from 226Ra and (40 ± 2)% from 228Th. This background suppression is achieved with (89 ± 1)% acceptance of 228Th double escape events, which are dominated by single site interactions. Approximately equal acceptance is expected for 0νββ-decay events. Collimated beam and Compton coincidence measurements demonstrate that the discrimination is largely independent of the interaction location inside the crystal and validate the pulse-shape cut in the energy range of Qββ. The application of BEGe detectors in the GERDA and the Majorana double beta decay experiments is under study.
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