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Background Suppression Using Pulse Shape Analysis with a BEGe Detector for Neutrinoless Double Beta Decay Search with GERDA

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Budjáš,  Dusan
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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Citation

Budjáš, D., Chkvorets, O., & Schönert, S. (2009). Background Suppression Using Pulse Shape Analysis with a BEGe Detector for Neutrinoless Double Beta Decay Search with GERDA. In Marvin L. Marshak (Ed.), 10th Conference on the Intersections of Particle and Nuclear Physics (pp. 96-99). Melville, N.Y.: American Institute of Physics.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-739E-7
Abstract
A pulse shape analysis for distinguishing between double beta decay-like interactions and multiple-scattered photons was performed for the first time using a BEGe-type detector. This discrimination method is included in the research and development for the second phase of the GERDA experiment, since active background suppression techniques are necessary to reach sensitivity for the 76Ge neutrinoless double beta decay half life of > 1026 years. A suppression of back­grounds in the energy region of interest around the 76Ge Qββ = 2039 keV is demonstrated, with (0.93 ± 0.08)% survival probability for events from 60Co, (21 ± 3)% for 226Ra, and (40 ± 2)% for 228Th. This performance is achieved with (89 ± 1)% acceptance of 228Th double escape events, which are analogous to double beta decay.