Results on neutrinoless double beta decay of 76 Ge from Gerda Phase I

M. Agostini, M. Allardt, E. Andreotti, 5 A.M. Bakalyarov, M. Balata, I. Barabanov, M. Barnabe Heider, 14, a N. Barros, L. Baudis, C. Bauer, N. Becerici-Schmidt, E. Bellotti, 8 S. Belogurov, 10 S.T. Belyaev, G. Benato, A. Bettini, 16 L. Bezrukov, T. Bode, V. Brudanin, R. Brugnera, 16 D. Budjas, A. Caldwell, C. Cattadori, A. Chernogorov, F. Cossavella, E.V. Demidova, A. Domula, V. Egorov, R. Falkenstein, A. Ferella, b K. Freund, N. Frodyma, A. Gangapshev, 6 A. Garfagnini, 16 C. Gotti, c P. Grabmayr, V. Gurentsov, K. Gusev, 4, 14 K.K. Guthikonda, W. Hampel, A. Hegai, M. Heisel, S. Hemmer, 16 G. Heusser, W. Hofmann, M. Hult, L.V. Inzhechik, d L. Ioannucci, J. Janicsko Csathy, J. Jochum, M. Junker, T. Kihm, I.V. Kirpichnikov, A. Kirsch, A. Klimenko, 6, e K.T. Knopfle, O. Kochetov, V.N. Kornoukhov, 10 V.V. Kuzminov, M. Laubenstein, A. Lazzaro, V.I. Lebedev, B. Lehnert, H.Y. Liao, M. Lindner, I. Lippi, X. Liu, f A. Lubashevskiy, B. Lubsandorzhiev, G. Lutter, C. Macolino, A.A. Machado, B. Majorovits, W. Maneschg, M. Misiaszek, I. Nemchenok, S. Nisi, C. O’Shaughnessy, g L. Pandola, K. Pelczar, G. Pessina, 7 A. Pullia, S. Riboldi, N. Rumyantseva, C. Sada, 16 M. Salathe, C. Schmitt, J. Schreiner, O. Schulz, B. Schwingenheuer, S. Schonert, E. Shevchik, M. Shirchenko, 4 H. Simgen, A. Smolnikov, L. Stanco, H. Strecker, M. Tarka, C.A. Ur, A.A. Vasenko, O. Volynets, K. von Sturm, 16 V. Wagner, M. Walter, A. Wegmann, T. Wester, M. Wojcik, E. Yanovich, P. Zavarise, h I. Zhitnikov, S.V. Zhukov, D. Zinatulina, K. Zuber, and G. Zuzel (Gerda collaboration) INFN Laboratori Nazionali del Gran Sasso, LNGS, Assergi, Italy Institute of Physics, Jagiellonian University, Cracow, Poland Institut fur Kernund Teilchenphysik, Technische Universitat Dresden, Dresden, Germany Joint Institute for Nuclear Research, Dubna, Russia Institute for Reference Materials and Measurements, Geel, Belgium Max-Planck-Institut fur Kernphysik, Heidelberg, Germany Dipartimento di Fisica, Universita Milano Bicocca, Milano, Italy INFN Milano Bicocca, Milano, Italy Dipartimento di Fisica, Universita degli Studi di Milano e INFN Milano, Milano, Italy Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia Institute for Theoretical and Experimental Physics, Moscow, Russia National Research Centre “Kurchatov Institute”, Moscow, Russia Max-Planck-Institut fur Physik, Munchen, Germany Physik Department and Excellence Cluster Universe, Technische Universitat Munchen, Germany Dipartimento di Fisica e Astronomia dell’Universita di Padova, Padova, Italy INFN Padova, Padova, Italy Physikalisches Institut, Eberhard Karls Universitat Tubingen, Tubingen, Germany Physik Institut der Universitat Zurich, Zurich, Switzerland