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          Institute: MPI für Kernphysik     Collection: Neutrino Physics     Display Documents

ID: 437715.0, MPI für Kernphysik / Neutrino Physics
Pulse shape discrimination studies with a Broad-Energy Germanium detector for signal identification and background suppression in the GERDA double beta decay experiment
Authors:Budjáš, Dusan; Barnabé-Heider, Marik; Chkvorets, Oleg; Khanbekov, Nikita; Schönert, Stefan
Date of Publication (YYYY-MM-DD):2009-10-20
Title of Journal:Journal of Instrumentation
Journal Abbrev.:JINST
Issue / Number:October 2009
Start Page:1
End Page:23
Sequence Number of Article:10007
Review Status:not specified
Audience:Experts Only
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group of M. Lindner
External Affiliations:Department of Physics, Laurentian University, Ramsey Lake Road, P3E 2C6 Sudbury, Ontario, Canada;
N. Khanbekov also at: Institute for Theoretical and Experimental Physics, Bolshaya Cheremushkinskaya 25, 117218 Moscow, Russia
Identifiers:URL:http://arxiv.org/abs/0909.4044 [arXiv version]
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