Upgrade for Phase II of the Gerda experiment

M. Agostini; A. M. Bakalyarov; M. Balata; I. Barabanov; L. Baudis; C. Bauer; E. Bellotti; S. Belogurov; S. T. Belyaev; G. Benato; A. Bettini; L. Bezrukov; T. Bode; D. Borowicz; V. Brudanin; R. Brugnera; A. Caldwell; C. Cattadori; A. Chernogorov; V. D’Andrea; E. V. Demidova; N. Di Marco; A. Domula; E. Doroshkevich; V. Egorov; R. Falkenstein; N. Frodyma; A. Gangapshev; A. Garfagnini; P. Grabmayr; V. Gurentsov; K. Gusev; J. Hakenmüller; A. Hegai; M. Heisel; S. Hemmer; R. Hiller; W. Hofmann; M. Hult; L. V. Inzhechik; L. Ioannucci; J. Janicskó Csáthy; J. Jochum; M. Junker; V. Kazalov; Y. Kermaïdic; T. Kihm; I. V. Kirpichnikov; A. Kirsch; A. Kish; A. Klimenko; R. Kneißl; K. T. Knöpfle; O. Kochetov; V. N. Kornoukhov; V. V. Kuzminov; M. Laubenstein; A. Lazzaro; V. I. Lebedev; B. Lehnert; M. Lindner; I. Lippi; A. Lubashevskiy; B. Lubsandorzhiev; G. Lutter; C. Macolino; B. Majorovits; W. Maneschg; E. Medinaceli; M. Miloradovic; R. Mingazheva; M. Misiaszek; P. Moseev; I. Nemchenok; S. Nisi; K. Panas; L. Pandola; K. Pelczar; A. Pullia; C. Ransom; S. Riboldi; N. Rumyantseva; C. Sada; F. Salamida; M. Salathe; C. Schmitt; B. Schneider; S. Schönert; J. Schreiner; A-K. Schütz; O. Schulz; B. Schwingenheuer; O. Selivanenko; E. Shevchik; M. Shirchenko; H. Simgen; A. Smolnikov; L. Stanco; L. Vanhoefer; A. A. Vasenko; A. Veresnikova; K. von Sturm; V. Wagner; A. Wegmann; T. Wester; C. Wiesinger; M. Wojcik; E. Yanovich; I. Zhitnikov; S. V. Zhukov; D. Zinatulina; A. J. Zsigmond; K. Zuber; G. Zuzel

doi:10.1140/epjc/s10052-018-5812-2

2021 Impact factor 4.991

Particles and Fields

Open Access

Eur. Phys. J. C (2018) 78: 388
https://doi.org/10.1140/epjc/s10052-018-5812-2

Regular Article - Experimental Physics

Upgrade for Phase II of the Gerda experiment

GERDA Collaboration
M. Agostini¹⁵, A. M. Bakalyarov¹³, M. Balata¹, I. Barabanov¹¹, L. Baudis¹⁹, C. Bauer⁷, E. Bellotti⁸^,9, S. Belogurov¹¹^,12, S. T. Belyaev¹³, G. Benato¹⁹, A. Bettini¹⁶^,17, L. Bezrukov¹¹, T. Bode¹⁵, D. Borowicz⁵, V. Brudanin⁵, R. Brugnera¹⁶^,17, A. Caldwell¹⁴, C. Cattadori⁹, A. Chernogorov¹², V. D’Andrea¹, E. V. Demidova¹², N. Di Marco¹, A. Domula⁴, E. Doroshkevich¹¹, V. Egorov⁵, R. Falkenstein¹⁸, N. Frodyma³, A. Gangapshev⁷^,11, A. Garfagnini¹⁶^,17, P. Grabmayr¹⁸^*, V. Gurentsov¹¹, K. Gusev⁵^,13^,15, J. Hakenmüller⁷, A. Hegai¹⁸, M. Heisel⁷, S. Hemmer¹⁶^,17, R. Hiller¹⁹, W. Hofmann⁷, M. Hult⁶, L. V. Inzhechik¹¹, L. Ioannucci¹, J. Janicskó Csáthy¹⁵, J. Jochum¹⁸, M. Junker¹, V. Kazalov¹¹, Y. Kermaïdic⁷, T. Kihm⁷, I. V. Kirpichnikov¹², A. Kirsch⁷, A. Kish¹⁹, A. Klimenko⁵^,7, R. Kneißl¹⁴, K. T. Knöpfle⁷, O. Kochetov⁵, V. N. Kornoukhov¹¹^,12, V. V. Kuzminov¹¹, M. Laubenstein¹, A. Lazzaro¹⁵, V. I. Lebedev¹³, B. Lehnert⁴, M. Lindner⁷, I. Lippi¹⁷, A. Lubashevskiy⁵, B. Lubsandorzhiev¹¹, G. Lutter⁶, C. Macolino¹, B. Majorovits¹⁴, W. Maneschg⁷, E. Medinaceli¹⁶^,17, M. Miloradovic¹⁹, R. Mingazheva¹⁹, M. Misiaszek³, P. Moseev¹¹, I. Nemchenok⁵, S. Nisi¹, K. Panas³, L. Pandola², K. Pelczar¹, A. Pullia¹⁰, C. Ransom¹⁹, S. Riboldi¹⁰, N. Rumyantseva⁵^,13, C. Sada¹⁶^,17, F. Salamida¹, M. Salathe⁷, C. Schmitt¹⁸, B. Schneider⁴, S. Schönert¹⁵, J. Schreiner⁷, A-K. Schütz¹⁸, O. Schulz¹⁴, B. Schwingenheuer⁷, O. Selivanenko¹¹, E. Shevchik⁵, M. Shirchenko⁵, H. Simgen⁷, A. Smolnikov⁵^,7, L. Stanco¹⁷, L. Vanhoefer¹⁴, A. A. Vasenko¹², A. Veresnikova¹¹, K. von Sturm¹⁶^,17, V. Wagner⁷, A. Wegmann⁷, T. Wester⁴, C. Wiesinger¹⁵, M. Wojcik³, E. Yanovich¹¹, I. Zhitnikov⁵, S. V. Zhukov¹³, D. Zinatulina⁵, A. J. Zsigmond¹⁴, K. Zuber⁴ and G. Zuzel³

¹ INFN Laboratori Nazionali del Gran Sasso and Gran Sasso Science Institute, Assergi, Italy
² INFN Laboratori Nazionali del Sud, Catania, Italy
³ Institute of Physics, Jagiellonian University, Kraków, Poland
⁴ Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany
⁵ Joint Institute for Nuclear Research, Dubna, Russia
⁶ European Commission, JRC-Geel, Geel, Belgium
⁷ Max-Planck-Institut für Kernphysik, Heidelberg, Germany
⁸ Dipartimento di Fisica, Università Milano Bicocca, Milan, Italy
⁹ INFN Milano Bicocca, Milan, Italy
¹⁰ Dipartimento di Fisica, Università degli Studi di Milano e INFN Milano, Milan, Italy
¹¹ Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia
¹² Institute for Theoretical and Experimental Physics, NRC “Kurchatov Institute”, Moscow, Russia
¹³ National Research Centre “Kurchatov Institute”, Moscow, Russia
¹⁴ Max-Planck-Institut für Physik, Munich, Germany
¹⁵ Physik Department and Excellence Cluster Universe, Technische Universität München, Munich, Germany
¹⁶ Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy
¹⁷ INFN Padova, Padua, Italy
¹⁸ Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany
¹⁹ Physik Institut der Universität Zürich, Zurich, Switzerland

^* e-mail: grabmayr@uni-tuebingen.de

Received: 1 November 2017
Accepted: 16 April 2018
Published online: 18 May 2018

Abstract

The Gerda collaboration is performing a sensitive search for neutrinoless double beta decay of at the INFN Laboratori Nazionali del Gran Sasso, Italy. The upgrade of the Gerda experiment from Phase I to Phase II has been concluded in December 2015. The first Phase II data release shows that the goal to suppress the background by one order of magnitude compared to Phase I has been achieved. Gerda is thus the first experiment that will remain “background-free” up to its design exposure (). It will reach thereby a half-life sensitivity of more than year within 3 years of data collection. This paper describes in detail the modifications and improvements of the experimental setup for Phase II and discusses the performance of individual detector components.