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Final Results of GERDA on the Search for Neutrinoless Double-$\beta$ Decay

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arxiv 2009.06079 v1 pith:NWCUVGTG submitted 2020-09-13 nucl-ex hep-exphysics.ins-det

classification nucl-exhep-exphysics.ins-det
keywords betacdotdecaygerdasignaldouble-exposuregermanium
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The GERmanium Detector Array (GERDA) experiment searched for the lepton-number-violating neutrinoless double-$\beta$ ($0\nu\beta\beta$) decay of $^{76}$Ge, whose discovery would have far-reaching implications in cosmology and particle physics. By operating bare germanium diodes, enriched in $^{76}$Ge, in an active liquid argon shield, GERDA achieved an unprecedently low background index of $5.2\times10^{-4}$ counts/(keV$\cdot$kg$\cdot$yr) in the signal region and met the design goal to collect an exposure of 100 kg$\cdot$yr in a background-free regime. When combined with the result of Phase I, no signal is observed after 127.2 kg$\cdot$yr of total exposure. A limit on the half-life of $0\nu\beta\beta$ decay in $^{76}$Ge is set at $T_{1/2}>1.8\times10^{26}$ yr at 90% C.L., which coincides with the sensitivity assuming no signal.

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Cited by 6 Pith papers

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