Results on neutrinoless double-β decay of Ge76 from phase i of the GERDA experiment

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Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the standard model of particle physics. This Letter reports the results from phase I of the Germanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope Ge-76. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kg yr. A blind analysis is performed. The background index is about 1 x 10(-2) counts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of Ge-76, T-1/2(0 nu) > 2.1 x 10(25) yr (90% C.L.). The combination with the results from the previous experiments with Ge-76 yields T-1/2(0 nu) > 3.0 x 10(25) yr (90% C. L.).

Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the standard model of particle physics. This Letter reports the results from phase I of the Germanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope Ge-76. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kg yr. A blind analysis is performed. The background index is about 1 x 10(-2) counts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of Ge-76, T-1/2(0 nu) > 2.1 x 10(25) yr (90% C.L.). The combination with the results from the previous experiments with Ge-76 yields T-1/2(0 nu) > 3.0 x 10(25) yr (90% C. L.).

Results on neutrinoless double-β decay of Ge76 from phase i of the GERDA experiment

Agostini, M.;Allardt, M.;Andreotti, E.;Bakalyarov, A. M.;Balata, M.;Barabanov, I.;Barnabé Heider, M.;Barros, N.;Baudis, L.;Bauer, C.;Becerici-Schmidt, N.;Bellotti, E.;Belogurov, S.;Belyaev, S. T.;Benato, G.;Bettini, A.;Bezrukov, L.;Bode, T.;Brudanin, V.;Brugnera, R.;Budjáš, D.;Caldwell, A.;Cattadori, C.;Chernogorov, A.;Cossavella, F.;Demidova, E. V.;Domula, A.;Egorov, V.;Falkenstein, R.;Ferella, A.;Freund, K.;Frodyma, N.;Gangapshev, A.;Garfagnini, A.;Gotti, C.;Grabmayr, P.;Gurentsov, V.;Gusev, K.;Guthikonda, K. K.;Hampel, W.;Hegai, A.;Heisel, M.;Hemmer, S.;Heusser, G.;Hofmann, W.;Hult, M.;Inzhechik, L. V.;Ioannucci, L.;Janicskó Csáthy, J.;Jochum, J.;Junker, M.;Kihm, T.;Kirpichnikov, I. V.;Kirsch, A.;Klimenko, A.;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.;Liu, X.;Lubashevskiy, A.;Lubsandorzhiev, B.;Lutter, G.;Macolino, C.;Machado, A. A.;Majorovits, B.;Maneschg, W.;Misiaszek, M.;Nemchenok, I.;Nisi, S.;O'Shaughnessy, C.;Pandola, L.;Pelczar, K.;Pessina, G.;Pullia, A.;Riboldi, S.;Rumyantseva, N.;Sada, C.;Salathe, M.;Schmitt, C.;Schreiner, J.;Schulz, O.;Schwingenheuer, B.;Schönert, S.;Shevchik, E.;Shirchenko, M.;Simgen, H.;Smolnikov, A.;Stanco, L.;Strecker, H.;Tarka, M.;Ur, C. A.;Vasenko, A. A.;Volynets, O.;von Sturm, K.;Wagner, V.;Walter, M.;Wegmann, A.;Wester, T.;Wojcik, M.;Yanovich, E.;Zavarise, P.;Zhitnikov, I.;Zhukov, S. V.;Zinatulina, D.;Zuber, K.;Zuzel, G.

2013-01-01

Abstract

Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the standard model of particle physics. This Letter reports the results from phase I of the Germanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope Ge-76. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kg yr. A blind analysis is performed. The background index is about 1 x 10(-2) counts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of Ge-76, T-1/2(0 nu) > 2.1 x 10(25) yr (90% C.L.). The combination with the results from the previous experiments with Ge-76 yields T-1/2(0 nu) > 3.0 x 10(25) yr (90% C. L.).

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				2013
			
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				PHYSICAL REVIEW LETTERS
			
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				https://dx.doi.org/10.1103/physrevlett.111.122503
			
	Abstract
	
				Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the standard model of particle physics. This Letter reports the results from phase I of the Germanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope Ge-76. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kg yr. A blind analysis is performed. The background index is about 1 x 10(-2) counts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of Ge-76, T-1/2(0 nu) &gt; 2.1 x 10(25) yr (90% C.L.). The combination with the results from the previous experiments with Ge-76 yields T-1/2(0 nu) &gt; 3.0 x 10(25) yr (90% C. L.).
			
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11697/246109

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