/ physics.ins-det arXiv:1611.06884


Limits on uranium and thorium bulk content in GERDA Phase I detectors


Agostini, M. (Gran Sasso) ; Allardt, M. (Dresden, Tech. U.) ; Bakalyarov, A.M. (Kurchatov Inst., Moscow) ; Balata, M. (Gran Sasso) ; Barabanov, I. (Moscow, INR) ; Baudis, L. (Zurich U.) ; Bauer, C. (Heidelberg, Max Planck Inst.) ; Becerici-Schmidt, N. (Munich, Max Planck Inst.) ; Bellotti, E. (INFN, Milan Bicocca) ; Belogurov, S. (Moscow, INR) ; 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. (Dubna, JINR) ; Brudanin, V. (Dubna, JINR) ; Brugnera, R. (INFN, Padua) ; Caldwell, A. (Munich, Max Planck Inst.) ; Cattadori, C. (INFN, Milan Bicocca) ; Chernogorov, A. (Moscow, ITEP) ; D'Andrea, V. (Gran Sasso) ; Demidova, E.V. (Moscow, ITEP) ; di Vacri, A. (Gran Sasso) ; Domula, A. (Dresden, Tech. U.) ; Doroshkevich, E. (Moscow, INR) ; Egorov, V. (Dubna, JINR) ; Falkenstein, R. (Tubingen U.) ; Fedorova, O. (Moscow, INR) ; Freund, K. (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) ; Hakemüller, J. (Heidelberg, Max Planck Inst.) ; Hegai, A. (Tubingen U.) ; Heisel, M. (Heidelberg, Max Planck Inst.) ; Hemmer, S. (INFN, Padua) ; Hofmann, W. (Heidelberg, Max Planck Inst.) ; Hult, M. (Geel, JRC) ; Inzhechik, L.V. (Moscow, MIPT) ; JanicskóCsáthy, J. (Munich, Tech. U., Universe) ; Jochum, J. (Tubingen U.) ; Junker, M. (Gran Sasso) ; Kazalov, V. (Moscow, INR) ; Kihm, T. (Heidelberg, Max Planck Inst.) ; Kirpichnikov, I.V. (Moscow, ITEP) ; Kirsch, A. (Heidelberg, Max Planck Inst.) ; Kish, A. (Zurich U.) ; Klimenko, A. (Dubna Intl. Univ.) ; Kneißl, R. (Munich, Tech. U., Universe) ; 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.) ; Liao, H.Y. (Munich, Max Planck Inst.) ; 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) ; Mingazheva, R. (Zurich U.) ; Misiaszek, M. (Jagiellonian U.) ; Moseev, P. (Moscow, INR) ; Nemchenok, I. (Dubna, JINR) ; Palioselitis, D. (Munich, Max Planck Inst.) ; Panas, K. (Jagiellonian U.) ; Pandola, L. (INFN, LNS) ; Pelczar, K. (Jagiellonian U.) ; Pullia, A. (Milan U.) ; Riboldi, S. (Milan U.) ; Rumyantseva, N. (Dubna, JINR) ; Sada, C. (INFN, Padua) ; Salamida, F. (INFN, Milan Bicocca) ; 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) ; Stepaniuk, M. (Heidelberg, Max Planck Inst.) ; Vanhoefer, L. (Munich, Max Planck Inst.) ; Vasenko, A.A. (Moscow, ITEP) ; Veresnikova, A. (Moscow, INR) ; von Sturm, K. (INFN, Padua) ; Wagner, V. (Heidelberg, Max Planck Inst.) ; Walter, M. (Zurich U.) ; 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) ; Zuber, K. (Dresden, Tech. U.) ; Zuzel, G. (Jagiellonian U.)

Pages: 7

Abstract: Internal contaminations of $^{238}$U, $^{235}$U and $^{232}$Th in the bulk of high purity germanium detectors are potential backgrounds for experiments searching for neutrinoless double beta decay of $^{76}$Ge. The data from GERDA Phase~I have been analyzed for alpha events from the decay chain of these contaminations by looking for full decay chains and for time correlations between successive decays in the same detector. No candidate events for a full chain have been found. Upper limits on the activities in the range of a few nBq/kg for $^{226}$Ra, $^{227}$Ac and $^{228}$Th, the long-lived daughter nuclides of $^{238}$U, $^{235}$U and $^{232}$Th, respectively, have been derived. With these upper limits a background index in the energy region of interest from $^{226}$Ra and $^{228}$Th contamination is estimated which satisfies the prerequisites of a future ton scale germanium double beta decay experiment.

Web-Page: http://inspirehep.net/record/1499539/files/fig02_data_DE100_mc.png; http://inspirehep.net/record/1499539/files/fig01_decay_chains.png; http://inspirehep.net/record/1499539/files/arXiv:1611.06884.pdf


Note: *Brief entry*; 2 figures, 7 pages; *Temporary entry*

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