Gerda phase II: Search for neutrinoless double beta decay

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

The GERDA (GERmanium Detector Array) experiment, located at the Laboratori Nazionali del Gran Sasso, is searching for neutrinoless double beta (0νββ) decay of 76 Ge. Since the end of 2015, in Phase II of the experiment, 35 kg of enriched high-purity germanium detectors are operated in liquid argon, that serves as cooling for the detectors as well as active shield against external radiation. The aim is a sensitivity on the 0νββ decay half-life larger than 10 26 yr with about 100 kg·yr exposure and a background level of about 10 −3 cts/(keV·kg·yr). An overview of the analysis of the data collected so far is presented with an emphasis on the background rejection techniques and their performance together with the half-life limit.

Gerda phase II: Search for neutrinoless double beta decay

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

2017-01-01

Abstract

The GERDA (GERmanium Detector Array) experiment, located at the Laboratori Nazionali del Gran Sasso, is searching for neutrinoless double beta (0νββ) decay of 76 Ge. Since the end of 2015, in Phase II of the experiment, 35 kg of enriched high-purity germanium detectors are operated in liquid argon, that serves as cooling for the detectors as well as active shield against external radiation. The aim is a sensitivity on the 0νββ decay half-life larger than 10 26 yr with about 100 kg·yr exposure and a background level of about 10 −3 cts/(keV·kg·yr). An overview of the analysis of the data collected so far is presented with an emphasis on the background rejection techniques and their performance together with the half-life limit.