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. 2020 Dec 18;125(25):252502.
doi: 10.1103/PhysRevLett.125.252502.

Final Results of GERDA on the Search for Neutrinoless Double-β Decay

M Agostini  1   2 , G R Araujo  3 , A M Bakalyarov  4 , M Balata  5 , I Barabanov  6 , L Baudis  3 , C Bauer  7 , E Bellotti  8   9 , S Belogurov  6   10 , A Bettini  11   12 , L Bezrukov  6 , V Biancacci  11   12 , D Borowicz  13 , E Bossio  2 , V Bothe  7 , V Brudanin  13 , R Brugnera  11   12 , A Caldwell  14 , C Cattadori  9 , A Chernogorov  10   4 , T Comellato  2 , V D'Andrea  15 , E V Demidova  10 , N Di Marco  5 , E Doroshkevich  6 , F Fischer  14 , M Fomina  13 , A Gangapshev  7   6 , A Garfagnini  11   12 , C Gooch  14 , P Grabmayr  16 , V Gurentsov  6 , K Gusev  13   4   2 , J Hakenmüller  7 , S Hemmer  12 , R Hiller  3 , W Hofmann  7 , J Huang  3 , M Hult  17 , L V Inzhechik  6 , J Janicskó Csáthy  2 , J Jochum  16 , M Junker  5 , V Kazalov  6 , Y Kermaïdic  7 , H Khushbakht  16 , T Kihm  7 , I V Kirpichnikov  10 , A Klimenko  13   7 , R Kneißl  14 , K T Knöpfle  7 , O Kochetov  13 , V N Kornoukhov  6 , P Krause  2 , V V Kuzminov  6 , M Laubenstein  5 , A Lazzaro  2 , M Lindner  7 , I Lippi  12 , A Lubashevskiy  13 , B Lubsandorzhiev  6 , G Lutter  17 , C Macolino  5 , B Majorovits  14 , W Maneschg  7 , L Manzanillas  14 , M Miloradovic  3 , R Mingazheva  3 , M Misiaszek  18 , P Moseev  6 , Y Müller  3 , I Nemchenok  13 , K Panas  18 , L Pandola  19 , K Pelczar  17 , L Pertoldi  11   12 , P Piseri  20 , A Pullia  20 , C Ransom  3 , L Rauscher  16 , S Riboldi  20 , N Rumyantseva  13   4 , C Sada  11   12 , F Salamida  15 , S Schönert  2 , J Schreiner  7 , M Schütt  7 , A-K Schütz  16 , O Schulz  14 , M Schwarz  2 , B Schwingenheuer  7 , O Selivanenko  6 , E Shevchik  13 , M Shirchenko  13 , L Shtembari  14 , H Simgen  7 , A Smolnikov  13   7 , D Stukov  4 , A A Vasenko  10 , A Veresnikova  6 , C Vignoli  5 , K von Sturm  11   12 , T Wester  21 , C Wiesinger  2 , M Wojcik  18 , E Yanovich  6 , B Zatschler  21 , I Zhitnikov  13 , S V Zhukov  4 , D Zinatulina  13 , A Zschocke  16 , A J Zsigmond  14 , K Zuber  21 , G Zuzel  18 ; GERDA Collaboration
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Free article

Final Results of GERDA on the Search for Neutrinoless Double-β Decay

M Agostini et al. Phys Rev Lett. .
Free article

Abstract

The GERmanium Detector Array (GERDA) experiment searched for the lepton-number-violating neutrinoless double-β (0νββ) 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 5.2×10^{-4} counts/(keV kg yr) in the signal region and met the design goal to collect an exposure of 100 kg yr in a background-free regime. When combined with the result of Phase I, no signal is observed after 127.2 kg yr of total exposure. A limit on the half-life of 0νββ decay in ^{76}Ge is set at T_{1/2}>1.8×10^{26} yr at 90% C.L., which coincides with the sensitivity assuming no signal.

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