GERDA results and the future perspectives for the neutrinoless double beta decay search using 76Ge-Reference-Cited by-同舟云学术

GERDA results and the future perspectives for the neutrinoless double beta decay search using 76Ge

Published:2018-03-30 Issue:09 Volume:33 Page:1843004
ISSN:0217-751X
Container-title:International Journal of Modern Physics A
language:en
Short-container-title:Int. J. Mod. Phys. A

Author:

,Agostini M.¹,Bakalyarov A. M.²,Balata M.¹,Barabanov I.³,Baudis L.⁴,Bauer C.⁵,Bellotti E.⁶⁷,Belogurov S.³⁸,Bettini A.⁹¹⁰,Bezrukov L.³,Biernat J.¹¹,Bode T.¹²,Borowicz D.¹³,Brudanin V.¹³,Brugnera R.⁹¹⁰,Caldwell A.¹⁴,Cattadori C.⁷,Chernogorov A.⁸,Comellato T.¹²,D’Andrea V.¹,Demidova E. V.⁸,Di Marco N.¹,Domula A.¹⁵,Doroshkevich E.³,Egorov V.¹³,Gangapshev A.⁵³,Garfagnini A.⁹¹⁰,Giordano M.¹⁶,Grabmayr P.¹⁷,Gurentsov V.³,Gusev K.¹³²¹²,Hakenmüller J.⁵,Heisel M.⁵,Hemmer S.¹⁰,Hiller R.⁴,Hofmann W.⁵,Hult M.¹⁸,Inzhechik L. V.³,Janicskó Csáthy J.¹²,Jochum J.⁴,Junker M.¹,Kazalov V.³,Kermaidic Y.⁵,Kihm T.⁵,Kirpichnikov I. V.⁸,Kirsch A.⁵,Klimenko A.⁵³,Kneißl R.¹⁴,Knöpfle K. T.⁵,Kochetov O.¹³,Kornoukhov V. N.³⁸,Kuzminov V. V.³,Laubenstein M.¹,Lazzaro A.¹²,Lindner M.⁵,Lippi I.¹⁰,Lubashevskiy A.³,Lubsandorzhiev B.³,Lutter G.¹⁸,Macolino C.¹,Majorovits B.¹⁴,Maneschg W.⁵,Miloradovic M.⁴,Mingazheva R.⁴,Misiaszek M.¹¹,Moseev P.³,Nemchenok I.¹³,Panas K.¹¹,Pandola L.¹⁹,Pelczar K.¹,Pertoldi L.⁹¹⁰,Pullia A.²⁰,Ransom C.⁴,Riboldi S.²⁰,Rumyantseva N.¹³²,Sada C.⁹¹⁰,Salamida F.¹⁶,Schneider B.¹⁵,Schönert S.¹²,Schreiner J.⁵,Schütz A.-K.¹⁷,Schulz O.¹⁴,Schwingenheuer B.⁵,Selivanenko O.³,Shevchik E.¹³,Shirchenko M.¹³,Simgen H.⁵,Smolnikov A.⁵³,Stanco L.¹⁰,Vanhoefer L.¹⁴,Vasenko A. A.⁸,Veresnikova A.³,von Sturm K.⁹¹⁰,Wagner V.⁵,Wegmann A.⁵,Wester T.¹⁵,Wiesinger C.¹²,Wojcik M.¹¹,Yanovich E.³,Zhitnikov I.¹³,Zhukov S. V.²,Zinatulina D.¹³,Zschocke A.¹⁷,Zsigmond A. J.¹⁴,Zuber K.¹⁵,Zuzel G.¹¹

Affiliation:

1. INFN Laboratori Nazionali del Gran Sasso and Gran Sasso Science Institute, Assergi, Italy

2. National Research Centre “Kurchatov Institute”, Moscow, Russia

3. Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia

4. Physik Institut der Universität Zürich, Zurich, Switzerland

5. Max-Planck-Institut für Kernphysik, Heidelberg, Germany

6. Dipartimento di Fisica, Università Milano Bicocca, Milan, Italy

7. INFN Milano Bicocca, Milan, Italy

8. Institute for Theoretical and Experimental Physics, NRC “Kurchatov Institute”, Moscow, Russia

9. Dipartimento di Fisica e Astronomia dell’Università di Padova, Padua, Italy

10. INFN Padova, Padua, Italy

11. Institute of Physics, Jagiellonian University, Cracow, Poland

12. Physik Department and Excellence Cluster Universe, Technische Universität München, Germany

13. Joint Institute for Nuclear Research, Dubna, Russia

14. Max-Planck-Institut für Physik, Munich, Germany

15. Institut für Kern – und Teilchenphysik, Technische Universität Dresden, Dresden, Germany

16. INFN Laboratori Nazionali del Gran Sasso and Università degli Studi dell’Aquila, L’Aquila, Italy

17. Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany

18. European Commission, JRC-Geel, Geel, Belgium

19. INFN Laboratori Nazionali del Sud, Catania, Italy

20. Dipartimento di Fisica, Università degli Studi di Milano e INFN Milano, Milan, Italy

Abstract

The GERmanium Detector Array (GERDA) is a low background experiment at the Laboratori Nazionali del Gran Sasso (LNGS) of INFN designed to search for the rare neutrinoless double beta decay ([Formula: see text]) of [Formula: see text]Ge. In the first phase (Phase I) of the experiment, high purity germanium diodes were operated in a “bare” mode and immersed in liquid argon. The overall background level of [Formula: see text] was a factor of ten better than those of its predecessors. No signal was found and a lower limit was set on the half-life for the [Formula: see text] decay of [Formula: see text]Ge [Formula: see text] yr (90% CL), while the corresponding median sensitivity was [Formula: see text] yr (90% CL). A second phase (Phase II) started at the end of 2015 after a major upgrade. Thanks to the increased detector mass and performance of the enriched germanium diodes and due to the introduction of liquid argon instrumentation techniques, it was possible to reduce the background down to [Formula: see text]. After analyzing 23.2 kg[Formula: see text]⋅[Formula: see text]yr of these new data no signal was seen. Combining these with the data from Phase I a stronger half-life limit of the [Formula: see text]Ge [Formula: see text] decay was obtained: [Formula: see text] yr (90% CL), reaching a sensitivity of [Formula: see text] yr (90% CL). Phase II will continue for the collection of an exposure of 100 kg[Formula: see text]yr. If no signal is found by then the GERDA sensitivity will have reached [Formula: see text] yr for setting a 90% CL. limit. After the end of GERDA Phase II, the flagship experiment for the search of [Formula: see text] decay of [Formula: see text]Ge will be LEGEND. LEGEND experiment is foreseen to deploy up to 1-ton of [Formula: see text]Ge. After ten years of data taking, it will reach a sensitivity beyond 10[Formula: see text] yr, and hence fully cover the inverted hierarchy region.

Publisher

World Scientific Pub Co Pte Lt

Subject

Astronomy and Astrophysics,Nuclear and High Energy Physics,Atomic and Molecular Physics, and Optics

Link

https://www.worldscientific.com/doi/pdf/10.1142/S0217751X18430042

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