2<i>νββ</i> decay of <sup>76</sup>Ge into excited states with GERDA phase I

Agostini, M.; Allardt, M.; Bakalyarov, A. M.; Balata, M.; Барабанов, И. Р.; Barros, N.; 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.; Budjáš, D.; Caldwell, A.; Cattadori, C.; Chernogorov, A.; D’Andrea, V.; Demidova, É. V.; Vacri, A. di; Domula, A.; Doroshkevich, E.; Egorov, V.; Falkenstein, R.; Федорова, О. В.; Freund, K.; Frodyma, N.; Gangapshev, A. M.; Garfagnini, A.; Gooch, C.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Hegai, A.; Heisel, M.; Hemmer, S.; Heusser, G.; Hofmann, W.; Hult, M.; Инжечик, Л. В.; Csáthy, J. Janicskó; Jochum, J.; Junker, M.; Kazalov, V. V.; 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.; Lindner, M.; Lippi, I.; Lubashevskiy, A.; Лубсандоржиев, Б.; Lutter, G.; Macolino, C.; Majorovits, B.; Maneschg, W.; Medinaceli, E.; Mi, Yu-Hao; Misiaszek, M.; Moseev, P.; Nemchenok, I.; Palioselitis, D.; Panas, K.; Pandola, L.; Pelczar, K.; Pullia, A.; Riboldi, S.; Rumyantseva, N.; Sada, Cinzia; Salathe, M.; Schmitt, C.; Schneider, B.; Schreiner, J.; Schulz, O.; Schwingenheuer, B.; Schönert, S.; Schütz, A.-K.; Selivanenko, O.; Shirchenko, M.; Simgen, H.; Smolnikov, A.; Stančo, L.; Stepaniuk, M.; Ur, C. A.; Vanhoefer, L.; Vasenko, A. A.; Veresnikova, A.; Sturm, K. von; Wagner, Victoria; Walter, Michael; Wegmann, A.; Wester, T.; Wilsenach, H.; Wójcik, Marcin; Yanovich, E.; Zavarise, P.; Zhitnikov, I.; Жуков, С. В.; Zinatulina, D.; Zuber, Κ.; Zuzel, G.

doi:10.1088/0954-3899/42/11/115201

Cited by 26 publications

(22 citation statements)

References 45 publications

(56 reference statements)

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“…2νββ decays to excited states have also been observed in 150 Nd in 2004 [10] and again in 2014 where the γ coincidence was explicitly measured [11]. More recently, current 0νββ experiments such as Gerda [12] and KamLAND-Zen [13] have searched for decays to excited states using 76 Ge and 136 Xe, respectively. Figure 1 shows the energy level scheme of the ββ decay of 136 Xe.…”

Section: Arxiv:151104770v2 [Nucl-ex] 22 Mar 2017mentioning

confidence: 97%

Search for2νββdecay ofXe136to the01+ex

Albert¹,

Auty²,

Barbeau³

et al. 2016

Phys. Rev. C

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EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless ββ decay of 136 Xe to the ground state of 136 Ba. We report here on a search for the two-neutrino ββ decay of 136 Xe to the first 0 + excited state, 0 + 1 , of 136 Ba based on a 100 kg·yr exposure of 136 Xe. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of 1.7 × 10 24 yr. We find no statistically significant evidence for the 2νββ decay to the excited state resulting in a lower limit of T 2ν 1/2 (0 + → 0 + 1 ) > 6.9 × 10 23 yr at 90% CL. This observed limit is consistent with the estimated half-life of 2.5×10 25 yr.

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Section: Arxiv:151104770v2 [Nucl-ex] 22 Mar 2017mentioning

confidence: 97%

Search for2νββdecay ofXe136to the01+ex

Albert¹,

Auty²,

Barbeau³

et al. 2016

Phys. Rev. C

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“…The 3" PMTs are installed on copper plates at the two ends of the cylindrical LAr volume facing inwards (see Figs. 10,11). These end plates are separated from the central fiber section by copper shrouds of 60 cm height.…”

Section: Lar Veto Systemmentioning

confidence: 99%

“…No signal was found for 0νββ decay, and a new 90% confidence level (CL) limit of T 0ν 1/2 > 2.1 × 10 25 year was derived (median sensitivity 2.4×10 25 year) that strongly disfavored a previous claim of observation [8,9]. Further Phase I results include a much improved half-life for 2νββ decay of 76 Ge and improved limits for Majoron ββ decay modes [10], as well as 2νββ decays of 76 Ge into excited states of 76 Se [11].…”

Section: Introductionmentioning

confidence: 96%

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Agostini¹,

Bakalyarov²,

Balata³

et al. 2018

Eur. Phys. J. C

123

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“…The measurement of the half-life of the neutrino accompanied double beta decay of 76 Ge by GERDA corresponds to 5.04 kg yr of exposure [8]. The observed spectrum in the energy range between 600 and 1800 keV is dominated by the double beta decay of 76 Ge.…”

Section: Measurement Of the 2νββ Decay Half-lifementioning

confidence: 99%

Results on neutrinoless double beta decay of⁷⁶Ge from the GERDA experiment

Palioselitis

2015

EPJ Web of Conferences

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Abstract. The Germanium Detector Array (GERDA) experiment is searching for neutrinoless double beta (0νββ) decay of 76 Ge, a lepton number violating nuclear process predicted by extensions of the Standard Model. GERDA is an array of bare germanium diodes immersed in liquid argon located at the Gran Sasso National Laboratory (LNGS) in Italy. The results of the GERDA Phase I data taking with a total exposure of 21.6 kg yr and a background index of 0.01 cts/(keV kg yr) are presented in this paper. No signal was observed and a lower limit of T 0ν 1/2 > 2.1 × 10 25 yr (90% C.L.) was derived for the half-life of the 0νββ decay of 76 Ge. Phase II of the experiment aims to reduce the background around the region of interest by a factor of ten.

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2νββ decay of ⁷⁶Ge into excited states with GERDA phase I

Cited by 26 publications

References 45 publications

Search for2νββdecay ofXe136to the01+ex

Search for2νββdecay ofXe136to the01+ex

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Results on neutrinoless double beta decay of⁷⁶Ge from the GERDA experiment

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2νββ decay of 76Ge into excited states with GERDA phase I

Cited by 26 publications

References 45 publications

Search for2νββdecay ofXe136to the01+ex

Search for2νββdecay ofXe136to the01+ex

Upgrade for Phase II of the Gerda experiment

Results on neutrinoless double beta decay of76Ge from the GERDA experiment

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2νββ decay of ⁷⁶Ge into excited states with GERDA phase I

Results on neutrinoless double beta decay of⁷⁶Ge from the GERDA experiment