Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 75, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-015-3627-y
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Funding
- German Federal Ministry for Education and Research (BMBF)
- German Research Foundation (DFG) via the Excellence Cluster Universe
- Italian Istituto Nazionale di Fisica Nucleare (INFN)
- Max Planck Society (MPG)
- Polish National Science Centre (NCN)
- Foundation for Polish Science (MPD programme)
- Russian Foundation for Basic Research (RFBR)
- Swiss National Science Foundation (SNF)
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A search for neutrinoless beta beta decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with spectral indices n = 1, 2, 3, 7 were searched for. No signals were found and lower limits of the order of 10(23) yr on their half-liveswere derived, yielding substantially improved results compared to previous experiments with Ge-76. A new result for the half-life of the neutrino-accompanied beta beta decay of Ge-76 with significantly reduced uncertainties is also given, resulting in T-1/1(2 nu) = (1.926 +/- 0.094) x 10(21) yr.
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