First results of GERDA Phase II and consistency with background models

Agostini, M.; Allardt, M.; Bakalyarov, A.M.; Balata, M.; Barabanov, I.; Baudis, L.; Bauer, C.; 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 Marco, N.; Domula, A.; Doroshkevich, E.; Egorov, V.; Falkenstein, R.; Frodyma, N.; Gangapshev, A.; Garfagnini, A.; Gooch, C.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Hakenmüller, J.; Hegai, A.; Heisel, M.; Hemmer, S.; Hofmann, W.; Hult, M.; Inzhechik, L.V.; Csáthy, J.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.; Miloradovic, M.; 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.; Schulz, O.; Schütz, A.-.; Schwingenheuer, B.; Selivanenko, O.; Shevzik, 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.; Zuber, K.; Zuzel, G.

doi:10.1088/1742-6596/798/1/012106

The GERDA (GERmanium Detector Array) is an experiment for the search of neutrinoless double beta decay (0Î½Î²Î²) in76Ge, located at Laboratori Nazionali del Gran Sasso of INFN (Italy). GERDA operates bare high purity germanium detectors submersed in liquid Argon (LAr). Phase II of data-taking started in Dec 2015 and is currently ongoing. In Phase II 35 kg of germanium detectors enriched in76Ge including thirty newly produced Broad Energy Germanium (BEGe) detectors is operating to reach an exposure of 100 kgâ¢yr within about 3 years data taking. The design goal of Phase II is to reduce the background by one order of magnitude to get the sensitivity for . To achieve the necessary background reduction, the setup was complemented with LAr veto. Analysis of the background spectrum of Phase II demonstrates consistency with the background models. Furthermore226Ra and232Th contamination levels consistent with screening results. In the first Phase II data release we found no hint for a 0Î½Î²Î² decay signal and place a limit of this process yr (90% C.L., sensitivity 4.0â¢1025yr). First results of GERDA Phase II will be presented.

First results of GERDA Phase II and consistency with background models / M. Agostini, M. Allardt, A.M. Bakalyarov, M. Balata, I. Barabanov, L. Baudis, C. Bauer, 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, N. Di Marco, A. Domula, E. Doroshkevich, V. Egorov, R. Falkenstein, N. Frodyma, A. Gangapshev, A. Garfagnini, C. Gooch, P. Grabmayr, V. Gurentsov, K. Gusev, J. Hakenmüller, A. Hegai, M. Heisel, S. Hemmer, W. Hofmann, M. Hult, L.V. Inzhechik, J.J. 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, M. Miloradovic, 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, O. Schulz, A.-. Schütz, B. Schwingenheuer, O. Selivanenko, E. Shevzik, M. Shirchenko, H. Simgen, A. Smolnikov, L. Stanco, L. Vanhoefer, A.A. Vasenko, A. Veresnikova, K. Von Sturm, V. Wagner, A. Wegmann, T. Wester, C. Wiesinger, M. Wojcik, E. Yanovich, I. Zhitnikov, S.V. Zhukov, D. Zinatulina, K. Zuber, G. Zuzel. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - 798:1(2017), pp. 012106.1-012106.6. ((Intervento presentato al 2. convegno International Conference on Particle Physics and Astrophysics tenutosi a Moscow nel 2016 [10.1088/1742-6596/798/1/012106].

First results of GERDA Phase II and consistency with background models

Agostini, M.;Allardt, M.;Bakalyarov, A. M.;Balata, M.;Barabanov, I.;Baudis, L.;Bauer, C.;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 Marco, N.;Domula, A.;Doroshkevich, E.;Egorov, V.;Falkenstein, R.;Frodyma, N.;Gangapshev, A.;Garfagnini, A.;Gooch, C.;Grabmayr, P.;Gurentsov, V.;Gusev, K.;Hakenmüller, J.;Hegai, A.;Heisel, M.;Hemmer, S.;Hofmann, W.;Hult, M.;Inzhechik, L. V.;Csáthy, J Janicskó;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.;Miloradovic, M.;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.;Schulz, O.;Schütz, A. -K.;Schwingenheuer, B.;Selivanenko, O.;Shevzik, 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.;Zuber, K.;Zuzel, G.

2017

Abstract

The GERDA (GERmanium Detector Array) is an experiment for the search of neutrinoless double beta decay (0Î½Î²Î²) in76Ge, located at Laboratori Nazionali del Gran Sasso of INFN (Italy). GERDA operates bare high purity germanium detectors submersed in liquid Argon (LAr). Phase II of data-taking started in Dec 2015 and is currently ongoing. In Phase II 35 kg of germanium detectors enriched in76Ge including thirty newly produced Broad Energy Germanium (BEGe) detectors is operating to reach an exposure of 100 kgâ¢yr within about 3 years data taking. The design goal of Phase II is to reduce the background by one order of magnitude to get the sensitivity for . To achieve the necessary background reduction, the setup was complemented with LAr veto. Analysis of the background spectrum of Phase II demonstrates consistency with the background models. Furthermore226Ra and232Th contamination levels consistent with screening results. In the first Phase II data release we found no hint for a 0Î½Î²Î² decay signal and place a limit of this process yr (90% C.L., sensitivity 4.0â¢1025yr). First results of GERDA Phase II will be presented.

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Scheda completa (DC)

	Parole chiave
	
				Physics and Astronomy (all)
			
	Settori scientifico-disciplinari dell'articolo
	
				Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
			
	Data di pubblicazione
	
				2017
			
	Rivista in ANCE
	
				JOURNAL OF PHYSICS. CONFERENCE SERIES
			
	Enti collegati al convegno
	
				National Research Nuclear University MEPhI in the framework of the Russian Academic Excellence Project
			
	DOI
	
				https://dx.doi.org/10.1088/1742-6596/798/1/012106
			
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				Article (author)
			
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				01 - Articolo su periodico

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