Study of the GERDA Phase II Background Spectrum

M. Agostini,M. Allardt,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,C. Gooch,P. Grabmayr,V. Gurentsov,K. Gusev,J. Hakenmuller,A. Hegai,M. Heisel, S. Hemmer,W. Hofmann,M. Hult,L. V. Inzhechik,J. Janicsko Csathy,J. Jochum,M. Junker,V. Kazalov,T. Kihm,I. V. Kirpichnikov,A. Kirsch,A. Kish,A. Klimenko,R. Kneissl, K. T. Knoepflc,O. Kochetov,V. N. Kornoukhov,V. V. Kuzminov,M. Laubenstein,A. Lazzaro,V. I. Lebedev,B. Lehnert,H. Y. Liao,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,D. Palioselitis,K. Panas,L. Pandola,K. Pelczar,A. Pullia,S. Riboldi,N. Rumyantseva,C. Sada,F. Salamida,M. Salathe,C. Schmitt,B. Schneider,S. Schoenert,J. Schreiner,O. Schulz,A. -K Schuetz,B. Schwingenheuer,O. Selivanenko, E. Shevzik,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,K. Zuber,G. Zuzel

Journal of physics Conference series（2017）

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Abstract

The Gerda experiment, located at the Laboratori Nazionali del Gran Sasso (LNGS) of INFN in Italy, searches for the neutrinoless double beta (0 nu beta beta) decay of Ge-76. Gerda Phase II is aiming to reach a sensitivity for the 0 nu beta beta half life of 10(26) yr in similar to 3 years of physics data taking with 100 kg.yr of exposure and a background index of similar to 10(-3) cts/(keV.kg.yr). After 6 months of acquisition a first data release with 10.8 kg.yr of exposure is performed, showing that the design background is achieved. In this work a study of the Phase II background spectrum, the main spectral structures and the background sources will be presented and discussed.

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