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

  • Author(s): collaboration, G
  • Agostini, M
  • Allardt, M
  • Bakalyarov, AM
  • Balata, M
  • Barabanov, I
  • Baudis, L
  • Bauer, C
  • Becerici-Schmidt, N
  • Bellotti, E
  • Belogurov, S
  • Belyaev, ST
  • Benato, G
  • Bettini, A
  • Bezrukov, L
  • Bode, T
  • Borowicz, D
  • Brudanin, V
  • Brugnera, R
  • Caldwell, A
  • Cattadori, C
  • Chernogorov, A
  • D'Andrea, V
  • Demidova, EV
  • di Vacri, A
  • Domula, A
  • Doroshkevich, E
  • Egorov, V
  • Falkenstein, R
  • Fedorova, O
  • Freund, K
  • Frodyma, N
  • Gangapshev, A
  • Garfagnini, A
  • Grabmayr, P
  • Gurentsov, V
  • Gusev, K
  • Hakemüller, J
  • Hegai, A
  • Heisel, M
  • Hemmer, S
  • Hofmann, W
  • Hult, M
  • Inzhechik, LV
  • Janicskó Csáthy, J
  • Jochum, J
  • Junker, M
  • Kazalov, V
  • Kihm, T
  • Kirpichnikov, IV
  • Kirsch, A
  • Kish, A
  • Klimenko, A
  • Kneißl, R
  • Knöpfle, KT
  • Kochetov, O
  • Kornoukhov, VN
  • Kuzminov, VV
  • Laubenstein, M
  • Lazzaro, A
  • Lebedev, VI
  • Lehnert, B
  • Liao, HY
  • Lindner, M
  • Lippi, I
  • Lubashevskiy, A
  • Lubsandorzhiev, B
  • Lutter, G
  • Macolino, C
  • Majorovits, B
  • Maneschg, W
  • Medinaceli, E
  • Mingazheva, R
  • Misiaszek, M
  • Moseev, P
  • Nemchenok, I
  • Palioselitis, D
  • Panas, K
  • Pandola, L
  • Pelczar, K
  • Pullia, A
  • Riboldi, S
  • Rumyantseva, N
  • et al.
Abstract

© 2017 The Authors Internal contaminations of238U,235U and232Th in the bulk of high purity germanium detectors are potential backgrounds for experiments searching for neutrinoless double beta decay of76Ge. 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 for226Ra,227Ac and228Th, the long-lived daughter nuclides of238U,235U and232Th, respectively, have been derived. With these upper limits a background index in the energy region of interest from226Ra and228Th contamination is estimated which satisfies the prerequisites of a future ton scale germanium double beta decay experiment.

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