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. 2018 Mar 30;120(13):132503.
doi: 10.1103/PhysRevLett.120.132503.

Improved Limit on Neutrinoless Double-β Decay of ^{76}Ge from GERDA Phase II

M Agostini  1 , A M Bakalyarov  2 , M Balata  1 , I Barabanov  3 , L Baudis  4 , C Bauer  5 , E Bellotti  6   7 , S Belogurov  3   8 , A Bettini  9   10 , L Bezrukov  3 , J Biernat  11 , T Bode  12 , D Borowicz  13 , V Brudanin  13 , R Brugnera  9   10 , A Caldwell  14 , C Cattadori  7 , A Chernogorov  8 , T Comellato  12 , V D'Andrea  1 , E V Demidova  8 , N Di Marco  1 , A Domula  15 , E Doroshkevich  3 , V Egorov  13 , R Falkenstein  16 , A Gangapshev  5   3 , A Garfagnini  9   10 , P Grabmayr  16 , V Gurentsov  3 , K Gusev  13   2   12 , J Hakenmüller  5 , A Hegai  16 , M Heisel  5 , S Hemmer  10 , R Hiller  4 , W Hofmann  5 , M Hult  17 , L V Inzhechik  3 , J Janicskó Csáthy  12 , J Jochum  16 , M Junker  1 , V Kazalov  3 , Y Kermaidic  5 , T Kihm  5 , I V Kirpichnikov  8 , A Kirsch  5 , A Kish  4 , A Klimenko  13   5 , R Kneißl  14 , K T Knöpfle  5 , O Kochetov  13 , V N Kornoukhov  3   8 , V V Kuzminov  3 , M Laubenstein  1 , A Lazzaro  12 , M Lindner  5 , I Lippi  10 , A Lubashevskiy  13 , B Lubsandorzhiev  3 , G Lutter  17 , C Macolino  1 , B Majorovits  14 , W Maneschg  5 , M Miloradovic  4 , R Mingazheva  4 , M Misiaszek  11 , P Moseev  3 , I Nemchenok  13 , K Panas  11 , L Pandola  18 , K Pelczar  1 , L Pertoldi  9   10 , A Pullia  19 , C Ransom  4 , S Riboldi  19 , N Rumyantseva  13   2 , C Sada  9   10 , F Salamida  20 , C Schmitt  16 , B Schneider  15 , S Schönert  12 , A-K Schütz  16 , O Schulz  14 , B Schwingenheuer  5 , O Selivanenko  3 , E Shevchik  13 , M Shirchenko  13 , H Simgen  5 , A Smolnikov  13   5 , L Stanco  10 , L Vanhoefer  14 , A A Vasenko  8 , A Veresnikova  3 , K von Sturm  9   10 , V Wagner  5 , A Wegmann  5 , T Wester  15 , C Wiesinger  12 , M Wojcik  11 , E Yanovich  3 , I Zhitnikov  13 , S V Zhukov  2 , D Zinatulina  13 , A Zschocke  16 , A J Zsigmond  14 , K Zuber  15 , G Zuzel  11 ; GERDA Collaboration
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Free article

Improved Limit on Neutrinoless Double-β Decay of ^{76}Ge from GERDA Phase II

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

Abstract

The GERDA experiment searches for the lepton-number-violating neutrinoless double-β decay of ^{76}Ge (^{76}Ge→^{76}Se+2e^{-}) operating bare Ge diodes with an enriched ^{76}Ge 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 1.0_{-0.4}^{+0.6}×10^{-3} counts/(keV kg yr) 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 8.0×10^{25} yr is placed when combining with our previous data. The expected median sensitivity assuming no signal is 5.8×10^{25} yr.

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