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Search for the double-beta decay of $^{82}$Se to the excited states of $^{82}$Kr with NEMO-3

R. Arnold 1 C. Augier 2 A.S. Barabash A. Basharina-Freshville S. Blondel 2 S. Blot M. Bongrand 2 D. Boursette 2 R. Breier V. Brudanin J. Busto 3 A.J. Caffrey S. Calvez 2 M. Cascella 2 C. Cerna 4 J.P. Cesar A. Chapon 5 E. Chauveau 4 A. Chopra L. Dawson D. Duchesneau 6 D. Durand 5 V. Egorov G. Eurin 2 J.J. Evans L. Fajt D. Filosofov R. Flack X. Garrido 2 C. Girard-Carillo 2 H. Gómez 2 B. Guillon 5 P. Guzowski R. Hodák A. Huber 4 P. Hubert 4 C. Hugon 4 S. Jullian 2 A. Klimenko O. Kochetov S.I. Konovalov V. Kovalenko D. Lalanne 2 K. Lang Y. Lemière 5 T. Le Noblet 6 Z. Liptak X.R. Liu P. Loaiza 2 G. Lutter 4 M. Macko C. Macolino 2 F. Mamedov C. Marquet 4 F. Mauger 5 A. Minotti 6 B. Morgan J. Mott I. Nemchenok M. Nomachi F. Nova F. Nowacki 1 H. Ohsumi G. Oliviéro 5 R.B. Pahlka V. Palusova 4 C. Patrick F. Perrot 4 A. Pin 4 F. Piquemal 4, 7 P. Povinec P. Přidal Y.A. Ramachers A. Remoto 6 J.L. Reyss 8 B. Richards C.L. Riddle E. Rukhadze R. Saakyan R. Salazar X. Sarazin 2 J. Sedgbeer Yu. Shitov L. Simard 2 F. Šimkovic A. Smetana K. Smolek A. Smolnikov S. Söldner-Rembold B. Soulé 4 I. Štekl J. Suhonen C.S. Sutton G. Szklarz 2 H. Tedjditi 3 J. Thomas V. Timkin S. Torre Vl.I. Tretyak V.I. Tretyak V.I. Umatov I. Vanushin C. Vilela V. Vorobel D. Waters F. Xie A. Žukauskas
Abstract : The double-beta decay of 82Se to the 0+1 excited state of 82Kr has been studied with the NEMO-3 detector using 0.93 kg of enriched 82Se measured for 4.75 y, corresponding to an exposure of 4.42 kg y. A dedicated analysis to reconstruct the gamma-rays has been performed to search for events in the 2e2g channel. No evidence of a 2nbb decay to the 0+1 state has been observed and a limit of T2n 1/2(82Se; 0+gs -> 0+1) > 1.3 1021 y at 90% CL has been set. Concerning the 0nbb decay to the 0+1 state, a limit for this decay has been obtained with T0n 1/2(82Se; 0+g s -> 0+1) > 2.3 1022 y at 90% CL, independently from the 2nbb decay process. These results are obtained for the first time with a tracko-calo detector, reconstructing every particle in the final state.
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R. Arnold, C. Augier, A.S. Barabash, A. Basharina-Freshville, S. Blondel, et al.. Search for the double-beta decay of $^{82}$Se to the excited states of $^{82}$Kr with NEMO-3. 2020. ⟨hal-02467317⟩

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