Abstract
The GERDA experiment searches for the lepton-number-violating neutrinoless double- decay of () operating bare Ge diodes with an enriched 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 has been achieved; if normalized to the energy resolution this is the lowest ever achieved in any experiment. No signal is observed and a new 90% C.L. lower limit for the half-life of is placed when combining with our previous data. The expected median sensitivity assuming no signal is .
- 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)
Viewpoint
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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