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

Collaboration, G.; Agostini, M.; Allardt, M.; Bakalyarov, A.M.; Balata, M.; Barabanov, I.; Baudis, L.; Bauer, C.; Becerici-Schmidt, N.; Bellotti, E.; Belogurov, S.; Belyaev, S.T.; Benato, G.; Bettini, A.; Bezrukov, L.; Bode, T.; Borowicz, D.; Brudanin, V.; Brugnera, R.; Caldwell, A.; Cattadori, C.; Chernogorov, A.; D'Andrea, V.; Demidova, E.V.; 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, L.V.; Janicskó Csáthy, J.; Jochum, J.; Junker, M.; Kazalov, V.; 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.; Lehnert, B.; Liao, H.Y.; 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.; Sada, C.; Salamida, F.; Salathe, M.; Schmitt, C.; Schneider, B.; Schönert, S.; Schreiner, J.; Schütz, A.-.; Schulz, O.; Schwingenheuer, B.; Selivanenko, O.; Shevchik, E.; Shirchenko, M.; Simgen, H.; Smolnikov, A.; Stanco, L.; Stepaniuk, M.; Vanhoefer, L.; Vasenko, A.A.; Veresnikova, A.; von Sturm, K.; Wagner, V.; Walter, M.; Wegmann, A.; Wester, T.; Wiesinger, C.; Wojcik, M.; Yanovich, E.; Zhitnikov, I.; Zhukov, S.V.; Zinatulina, D.; Zuber, K.; Zuzel, G.

doi:10.1016/j.astropartphys.2017.03.003

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 the 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.

Limits on uranium and thorium bulk content in GERDA Phase I detectors / G. 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.-. 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. - In: ASTROPARTICLE PHYSICS. - ISSN 0927-6505. - 91(2017), pp. 15-21.

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

collaboration, GERDA;Agostini, M.;Allardt, M.;Bakalyarov, A. M.;Balata, M.;Barabanov, I.;Baudis, L.;Bauer, C.;Becerici-Schmidt, N.;Bellotti, E.;Belogurov, S.;Belyaev, S. T.;Benato, G.;Bettini, A.;Bezrukov, L.;Bode, T.;Borowicz, D.;Brudanin, V.;Brugnera, R.;Caldwell, A.;Cattadori, C.;Chernogorov, A.;D'Andrea, V.;Demidova, E. V.;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, L. V.;Janicskó Csáthy, J.;Jochum, J.;Junker, M.;Kazalov, V.;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.;Lehnert, B.;Liao, H. Y.;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.;A. Pullia;S. Riboldi;Rumyantseva, N.;Sada, C.;Salamida, F.;Salathe, M.;Schmitt, C.;Schneider, B.;Schönert, S.;Schreiner, J.;Schütz, A. -K.;Schulz, O.;Schwingenheuer, B.;Selivanenko, O.;Shevchik, E.;Shirchenko, M.;Simgen, H.;Smolnikov, A.;Stanco, L.;Stepaniuk, M.;Vanhoefer, L.;Vasenko, A. A.;Veresnikova, A.;von Sturm, K.;Wagner, V.;Walter, M.;Wegmann, A.;Wester, T.;Wiesinger, C.;Wojcik, M.;Yanovich, E.;Zhitnikov, I.;Zhukov, S. V.;Zinatulina, D.;Zuber, K.;Zuzel, G.

2017

Abstract

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 the 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.

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	Parole chiave
	
			double beta decay; germanium detectors; radiopurity; uranium and thorium bulk content; Astronomy and Astrophysics
		
	Settori scientifico-disciplinari dell'articolo
	
			Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
		
	Data di pubblicazione
	
			2017
		
	Rivista in ANCE
	
			ASTROPARTICLE PHYSICS
		
	DOI
	
			https://dx.doi.org/10.1016/j.astropartphys.2017.03.003
		
	Tipologia
	
			Article (author)
		
	Appare nelle tipologie:
	
			01 - Articolo su periodico

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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/556024

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