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

GERDA collaboration, M. Agostini, M. Allardt, A.M. Bakalyarov, M. Balata, I. Barabanov, L. Baudis, C. Bauer, N. Becerici-Schmidt, E. Bellotti, S. Belogurov, S.T. Belyaev (+104 others)
2017 Astroparticle physics  

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2016 pre-print
arXiv:1611.06884v1 fatcat:ebtjnluivnbvdppinst6whikpi
Internal contaminations of ^238U, ^235U and ^232Th in the bulk of high purity germanium detectors are potential backgrounds for experiments searching for neutrinoless double beta decay of ^76Ge. 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
more » ... he range of a few nBq/kg for ^226Ra, ^227Ac and ^228Th, the long-lived daughter nuclides of ^238U, ^235U and ^232Th, respectively, have been derived. With these upper limits a background index in the energy region of interest from ^226Ra and ^228Th contamination is estimated which satisfies the prerequisites of a future ton scale germanium double beta decay experiment.
doi:10.1016/j.astropartphys.2017.03.003 fatcat:roztpyg4qvgwbj3hejwfq5ryuq
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Citation

GERDA collaboration, M. Agostini, M. Allardt, A.M. Bakalyarov, M. Balata, I. Barabanov, L. Baudis, C. Bauer, N. Becerici-Schmidt, 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, A. di Vacri, A. Domula, E. Doroshkevich, V. Egorov, R. Falkenstein, O. Fedorova, K. Freund, N. Frodyma, A. Gangapshev, A. Garfagnini, P. Grabmayr, V. Gurentsov, K. Gusev, J. Hakemüller, A. Hegai, M. Heisel, S. Hemmer, W. Hofmann, M. Hult, L.V. Inzhechik, J. Janicskó Csáthy, J. Jochum, M. Junker, V. Kazalov, T. Kihm, I.V. Kirpichnikov, A. Kirsch, A. Kish, A. Klimenko, R. Kneißl, K.T. Knöpfle, 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, 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. Schönert, J. Schreiner, A.-K. Schütz, O. Schulz, B. Schwingenheuer, O. Selivanenko, E. Shevchik, M. Shirchenko, H. Simgen, A. Smolnikov, L. Stanco, M. Stepaniuk, L. Vanhoefer, A.A. Vasenko, A. Veresnikova, K. von Sturm, V. Wagner, M. Walter, A. Wegmann, T. Wester, C. Wiesinger, M. Wojcik, E. Yanovich, I. Zhitnikov, S.V. Zhukov, D. Zinatulina, K. Zuber, G. Zuzel. "Limits on uranium and thorium bulk content in Gerda Phase I detectors." Astroparticle physics (2017) 15-21