Upgrade for Phase II of the GERDA Experiment
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Upgrade for Phase II of the GERDA Experiment

  • Author(s): Agostini, M
  • Bakalyarov, AM
  • Balata, M
  • Barabanov, I
  • Baudis, L
  • Bauer, C
  • Bellotti, E
  • Belogurov, S
  • Belyaev, ST
  • Benato, G
  • Bettini, A
  • Bezrukov, L
  • Bode, T
  • Borowicz, D
  • Brudanin, V
  • Brugnera, R
  • Caldwell, A
  • Cattadori, C
  • Chernogorov, A
  • D'Andrea, V
  • Demidova, EV
  • Marco, ND
  • Domula, A
  • Doroshkevich, E
  • Egorov, V
  • Falkenstein, R
  • Frodyma, N
  • Gangapshev, A
  • Garfagnini, A
  • Grabmayr, P
  • Gurentsov, V
  • Gusev, K
  • Hakenmüller, J
  • Hegai, A
  • Heisel, M
  • Hemmer, S
  • Hiller, R
  • Hofmann, W
  • Hult, M
  • Inzhechik, LV
  • Ioannucci, L
  • Csathy, JJ
  • Jochum, J
  • Junker, M
  • Kazalov, V
  • Kermaidic, Y
  • Kihm, T
  • Kirpichnikov, IV
  • Kirsch, A
  • Kish, A
  • Klimenko, A
  • Kneissl, R
  • Knöpfle, KT
  • Kochetov, O
  • Kornoukhov, VN
  • Kuzminov, VV
  • Laubenstein, M
  • Lazzaro, A
  • Lebedev, VI
  • Lehnert, B
  • Lindner, M
  • Lippi, I
  • Lubashevskiy, A
  • Lubsandorzhiev, B
  • Lutter, G
  • Macolino, C
  • Majorovits, B
  • Maneschg, W
  • Medinaceli, E
  • Miloradovic, M
  • Mingazheva, R
  • Misiaszek, M
  • Moseev, P
  • Nemchenok, I
  • Nisi, S
  • Panas, K
  • Pandola, L
  • Pelczar, K
  • Pullia, A
  • Ransom, C
  • Riboldi, S
  • Rumyantseva, N
  • Sada, C
  • Salamida, F
  • Salathe, M
  • Schmitt, C
  • Schneider, B
  • Schönert, S
  • Schreiner, J
  • Schütz, A-K
  • Schulz, O
  • Schwingenheuer, B
  • Selivanenko, O
  • Shevchik, E
  • Shirchenko, M
  • Simgen, H
  • Smolnikov, A
  • Stanco, L
  • Vanhoefer, L
  • Vasenko, AA
  • Veresnikova, A
  • Sturm, KV
  • Wagner, V
  • Wegmann, A
  • Wester, T
  • Wiesinger, C
  • Wojcik, M
  • Yanovich, E
  • Zhitnikov, I
  • Zhukov, SV
  • Zinatulina, D
  • Zsigmond, AJ
  • Zuber, K
  • Zuzel, G
  • et al.
Abstract

The GERDA collaboration is performing a sensitive search for neutrinoless double beta decay of $^{76}$Ge 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 (100 kg yr). It will reach thereby a half-life sensitivity of more than 10$^{26}$ yr 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.

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