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Improved Limit on Neutrinoless Double-β Decay of Ge76 from GERDA Phase II


GERDA Collaboration; Baudis, Laura; Hiller, Roman; Miloradovic, Michael; Mingazheva, Rizalina; et al (2018). Improved Limit on Neutrinoless Double-β Decay of Ge76 from GERDA Phase II. Physical Review Letters, 120(13):132503.

Abstract

The GERDA experiment searches for the lepton-number-violating neutrinoless double-β decay of Ge76 (Ge76→Se76+2e-) operating bare Ge diodes with an enriched Ge76 fraction in liquid argon. The exposure for broad-energy germanium type (BEGe) detectors is increased threefold with respect to our previous data release. The BEGe detectors feature an excellent background suppression from the analysis of the time profile of the detector signals. In the analysis window a background level of 1.0-0.4+0.6×10-3  counts/(keV kg yr) has been achieved; if normalized to the energy resolution this is the lowest ever achieved in any 0νββ experiment. No signal is observed and a new 90% C.L. lower limit for the half-life of 8.0×1025  yr is placed when combining with our previous data. The expected median sensitivity assuming no signal is 5.8×1025  yr.

Abstract

The GERDA experiment searches for the lepton-number-violating neutrinoless double-β decay of Ge76 (Ge76→Se76+2e-) operating bare Ge diodes with an enriched Ge76 fraction in liquid argon. The exposure for broad-energy germanium type (BEGe) detectors is increased threefold with respect to our previous data release. The BEGe detectors feature an excellent background suppression from the analysis of the time profile of the detector signals. In the analysis window a background level of 1.0-0.4+0.6×10-3  counts/(keV kg yr) has been achieved; if normalized to the energy resolution this is the lowest ever achieved in any 0νββ experiment. No signal is observed and a new 90% C.L. lower limit for the half-life of 8.0×1025  yr is placed when combining with our previous data. The expected median sensitivity assuming no signal is 5.8×1025  yr.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > General Physics and Astronomy
Language:English
Date:26 March 2018
Deposited On:18 Dec 2018 17:08
Last Modified:29 Jul 2020 08:13
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevlett.120.132503
Project Information:
  • : FunderH2020
  • : Grant ID674896
  • : Project TitleELUSIVES - The Elusives Enterprise: Asymmetries of the Invisible Universe
  • : FunderH2020
  • : Grant ID690575
  • : Project TitleInvisiblesPlus - InvisiblesPlus

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