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

M. Agostini et al. (GERDA Collaboration)
Phys. Rev. Lett. 120, 132503 – Published 26 March 2018
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Abstract

The GERDA experiment searches for the lepton-number-violating neutrinoless double-β decay of Ge76 (Ge76Se76+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 1.00.4+0.6×103counts/(keVkgyr) 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 8.0×1025yr is placed when combining with our previous data. The expected median sensitivity assuming no signal is 5.8×1025yr.

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  • Received 17 November 2017
  • Revised 23 January 2018

DOI:https://doi.org/10.1103/PhysRevLett.120.132503

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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The Hunt for No Neutrinos

Published 26 March 2018

Four experiments have demonstrated new levels of sensitivity to neutrinoless double-beta decay, a process whose existence would prove that neutrinos are their own antiparticles.

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See Also

First Results from CUORE: A Search for Lepton Number Violation via 0νββ Decay of Te130

C. Alduino et al. (CUORE Collaboration)
Phys. Rev. Lett. 120, 132501 (2018)

Search for Neutrinoless Double-β Decay in Ge76 with the Majorana Demonstrator

C. E. Aalseth et al. (Majorana Collaboration)
Phys. Rev. Lett. 120, 132502 (2018)

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Vol. 120, Iss. 13 — 30 March 2018

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