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June 22, 2020 to July 2, 2020
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New Results of the MAJORANA DEMONSTRATOR's for Double-Beta Decay of $^{76}$Ge to Excited States of $^{76}$Se

Not scheduled


Ian Guinn (University of North Carolina at Chapel Hill)


The MAJORANA DEMONSTRATOR (MJD) is a low-background experiment searching for $\beta\beta$-decay of $^{76}$Ge to ground and excited states (ES) in $^{76}$Se using a modular array of high purity germanium detectors. The experiment consists of two modules with 29 detectors each, consisting of 44.8 kg of germanium detectors (29.7 kg enriched to 88% in $^{76}$Ge). ES decays produce a $\beta\beta$ with the prompt emission of one or two γs, often producing multisite events. The granularity of the MJD detector array enables powerful discrimination of ES events from backgrounds. for neutrinoless and two-neutrino $\beta\beta$s to three different ES, MJD has set world leading half-life limits ranging from $(5-21)\cdot10^{23}$ y (90% CL), using 21 kg-y isotopic exposure. This poster will present analysis techniques and an improved result including previously blinded data with $\sim42$ kg-y exposure.


The MAJORANA DEMONSTRATOR has leading sensitivity to $\beta\beta$ of $^{76}$Ge to excited states

Experiment/Collaboration Majorana Collaboration

Primary author

Ian Guinn (University of North Carolina at Chapel Hill)

Presentation Materials