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

MPG-Autoren
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Budjáš,  Dusan
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Barnabé-Heider,  Marik
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Chkvorets,  Oleg
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Schönert,  Stefan
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Zitation

Budjáš, D., Barnabé-Heider, M., Chkvorets, O., Khanbekov, N., & Schönert, S. (2009). Pulse shape discrimination studies with a Broad-Energy Germanium detector for signal identification and background suppression in the GERDA double beta decay experiment. Journal of Instrumentation, 4(October 2009): 10007, pp. 1-23. doi:10.1088/1748-0221/4/10/P10007.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0011-740F-0
Zusammenfassung
First 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.