/ physics.ins-det arXiv:1711.01452

Upgrade for Phase II of the GERDA Experiment

Agostini, M. (Munich, Tech. U., Universe) ; Bakalyarov, A.M. (Kurchatov Inst., Moscow) ; Balata, M. (Gran Sasso) ; Barabanov, I. (Moscow, INR) ; Baudis, L. (Zurich U.) ; Bauer, C. (Heidelberg, Max Planck Inst.) ; Bellotti, E. (INFN, Milan Bicocca) ; Belogurov, S. (Moscow Phys. Eng. Inst.) ; Belyaev, S.T. (Kurchatov Inst., Moscow) ; Benato, G. (Zurich U.) ; Bettini, A. (INFN, Padua) ; Bezrukov, L. (Moscow, INR) ; Bode, T. (Munich, Tech. U., Universe) ; Borowicz, D. (Cracow, INP) ; Brudanin, V. (Dubna, JINR) ; Brugnera, R. (INFN, Padua) ; Caldwell, A. (Munich, Max Planck Inst.) ; Cattadori, C. (INFN, Milan Bicocca) ; Chernogorov, A. (Kurchatov Inst., Moscow) ; D'Andrea, V. (Gran Sasso) ; Demidova, E.V. (Kurchatov Inst., Moscow) ; Di Marco, N. (Gran Sasso) ; Domula, A. (Dresden, Tech. U.) ; Doroshkevich, E. (Moscow, INR) ; Egorov, V. (Dubna, JINR) ; Falkenstein, R. (Tubingen U.) ; Frodyma, N. (Jagiellonian U.) ; Gangapshev, A. (Heidelberg, Max Planck Inst.) ; Garfagnini, A. (INFN, Padua) ; Grabmayr, P. (Tubingen U.) ; Gurentsov, V. (Moscow, INR) ; Gusev, K. (Munich, Tech. U., Universe) ; Hakenmüller, J. (Heidelberg, Max Planck Inst.) ; Hegai, A. (Tubingen U.) ; Heisel, M. (Heidelberg, Max Planck Inst.) ; Hemmer, S. (INFN, Padua) ; Hiller, R. (Zurich U.) ; Hofmann, W. (Heidelberg, Max Planck Inst.) ; Hult, M. (Geel, JRC) ; Inzhechik, L.V. (Moscow, MIPT) ; Ioannucci, L. (Gran Sasso) ; JanicskóCsáthy, J. (Munich, Tech. U., Universe) ; Jochum, J. (Tubingen U.) ; Junker, M. (Gran Sasso) ; Kazalov, V. (Moscow, INR) ; Kermaidic, Y. (Heidelberg, Max Planck Inst.) ; Kihm, T. (Heidelberg, Max Planck Inst.) ; Kirpichnikov, I.V. (Kurchatov Inst., Moscow) ; Kirsch, A. (Heidelberg, Max Planck Inst.) ; Kish, A. (Zurich U.) ; Klimenko, A. (Dubna, JINR) ; Kneißl, R. (Munich, Max Planck Inst.) ; Knöpfle, K.T. (Heidelberg, Max Planck Inst.) ; Kochetov, O. (Dubna, JINR) ; Kornoukhov, V.N. (Moscow, INR) ; Kuzminov, V.V. (Moscow, INR) ; Laubenstein, M. (Gran Sasso) ; Lazzaro, A. (Munich, Tech. U., Universe) ; Lebedev, V.I. (Kurchatov Inst., Moscow) ; Lehnert, B. (Dresden, Tech. U.) ; Lindner, M. (Heidelberg, Max Planck Inst.) ; Lippi, I. (INFN, Padua) ; Lubashevskiy, A. (Dubna, JINR) ; Lubsandorzhiev, B. (Moscow, INR) ; Lutter, G. (Geel, JRC) ; Macolino, C. (Gran Sasso) ; Majorovits, B. (Munich, Max Planck Inst.) ; Maneschg, W. (Heidelberg, Max Planck Inst.) ; Medinaceli, E. (INFN, Padua) ; Miloradovic, M. (Zurich U.) ; Mingazheva, R. (Zurich U.) ; Misiaszek, M. (Jagiellonian U.) ; Moseev, P. (Moscow, INR) ; Nemchenok, I. (Dubna, JINR) ; Nisi, S. (Gran Sasso) ; Panas, K. (Jagiellonian U.) ; Pandola, L. (INFN, LNS) ; Pelczar, K. (Gran Sasso) ; Pullia, A. (Milan U.) ; Ransom, C. (Zurich U.) ; Riboldi, S. (Milan U.) ; Rumyantseva, N. (Kurchatov Inst., Moscow) ; Sada, C. (INFN, Padua) ; Salamida, F. (L'Aquila U.) ; Salathe, M. (Heidelberg, Max Planck Inst.) ; Schmitt, C. (Tubingen U.) ; Schneider, B. (Dresden, Tech. U.) ; Schönert, S. (Munich, Tech. U., Universe) ; Schreiner, J. (Heidelberg, Max Planck Inst.) ; Schütz, A-K. (Tubingen U.) ; Schulz, O. (Munich, Max Planck Inst.) ; Schwingenheuer, B. (Heidelberg, Max Planck Inst.) ; Selivanenko, O. (Moscow, INR) ; Shevchik, E. (Dubna, JINR) ; Shirchenko, M. (Dubna, JINR) ; Simgen, H. (Heidelberg, Max Planck Inst.) ; Smolnikov, A. (Dubna, JINR) ; Stanco, L. (INFN, Padua) ; Vanhoefer, L. (Munich, Max Planck Inst.) ; Vasenko, A.A. (Kurchatov Inst., Moscow) ; Veresnikova, A. (Moscow, INR) ; von Sturm, K. (INFN, Padua) ; Wagner, V. (Heidelberg, Max Planck Inst.) ; Wegmann, A. (Heidelberg, Max Planck Inst.) ; Wester, T. (Dresden, Tech. U.) ; Wiesinger, C. (Munich, Tech. U., Universe) ; Wojcik, M. (Jagiellonian U.) ; Yanovich, E. (Moscow, INR) ; Zhitnikov, I. (Dubna, JINR) ; Zhukov, S.V. (Kurchatov Inst., Moscow) ; Zinatulina, D. (Dubna, JINR) ; Zsigmond, A.J. (Munich, Max Planck Inst.) ; Zuber, K. (Dresden, Tech. U.) ; Zuzel, G. (Jagiellonian U.)

Pages: 31

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.

Web-Page: http://inspirehep.net/record/1634658/files/fig05_gerda-cc3.png; http://inspirehep.net/record/1634658/files/fig30_G1707_6_OverlayBlind2.png; http://inspirehep.net/record/1634658/files/fig18_G1707_6_Signals.png; http://inspirehep.net/record/1634658/files/fig28_G1707_3_LArKlines.png; http://inspirehep.net/record/1634658/files/fig11_PMTbottom.png; http://inspirehep.net/record/1634658/files/fig19_p2-lock-tipp-wtxt.png; http://inspirehep.net/record/1634658/files/fig02_sens_bw-plot-new-v2.png; http://inspirehep.net/record/1634658/files/fig10_PMTtop.png; http://inspirehep.net/record/1634658/files/fig15_fiber_holder.png; http://inspirehep.net/record/1634658/files/fig33_Dec2015_Strings.png; http://inspirehep.net/record/1634658/files/fig09_detail-08640-ff.png; http://inspirehep.net/record/1634658/files/fig23_survivalefficiency.png; http://inspirehep.net/record/1634658/files/fig08_nms_42K.png; http://inspirehep.net/record/1634658/files/fig26_G1707_3_LArCh24.png; http://inspirehep.net/record/1634658/files/fig07_g2-BEGe-array005104-007447_txt.png; http://inspirehep.net/record/1634658/files/fig03b_bege_txt-1.png; http://inspirehep.net/record/1634658/files/fig27a_G1707_3_LArTh228.png; http://inspirehep.net/record/1634658/files/fig25_G1707_3_LArCh14.png; http://inspirehep.net/record/1634658/files/fig03a_bege-pair_txt-1.png; http://inspirehep.net/record/1634658/files/fig31_arrayfoto.png; http://inspirehep.net/record/1634658/files/fig27b_G1707_3_LArRa226.png; http://inspirehep.net/record/1634658/files/fig22b_stability_p2b_coax.png; http://inspirehep.net/record/1634658/files/fig14_IMG_6417_lowres.png; http://inspirehep.net/record/1634658/files/fig32_arr1.png; http://inspirehep.net/record/1634658/files/fig17_SiPM_schema2.png; http://inspirehep.net/record/1634658/files/fig34_leackage-alldets_r53_79-vert.png; http://inspirehep.net/record/1634658/files/fig04_jig-bonder-proc.png; http://inspirehep.net/record/1634658/files/fig29_daily_rates_muon_veto_dec15toapril17.png; http://inspirehep.net/record/1634658/files/fig01_gerda_1503-g-leg1.png; http://inspirehep.net/record/1634658/files/fig13_PMTVD.png; http://inspirehep.net/record/1634658/files/fig22a_stability_p2b_bege.png; http://inspirehep.net/record/1634658/files/fig16_SiPM_package.png; http://inspirehep.net/record/1634658/files/fig20_leackage-det3_r53_79.png; http://inspirehep.net/record/1634658/files/fig24_PMT-triplet-lifetime-nf.png; http://inspirehep.net/record/1634658/files/fig06_CC3.png; http://inspirehep.net/record/1634658/files/fig21_energy_ae_resolution_p2b.png; http://inspirehep.net/record/1634658/files/fig12_PMTplug.png; http://inspirehep.net/record/1634658/files/arXiv:1711.01452.pdf

Note: 31 pages, 34 figures

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