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  • Search for the double-beta decay of 82Se to the excited states of 82Kr with NEMO-3
    The NEMO-3 collaboration R Arnold; Augier, C; Barabash, A S; Basharina-Freshville, A; Blondel, S; Blot, S; Bongrand, M; Boursette, D; Breier, R; Brudanin, V; Busto, J; Caffrey, A J; Calvez, S; Cascella, M; Cerna, C; Cesar, J P; Chapon, A; Chauveau, E; Chopra, A; Dawson, L; Duchesneau, D; Durand, D; Egorov, V; Eurin, G; Evans, J J; Fajt, L; Filosofov, D; Flack, R; Garrido, X; Girard-Carillo, C; Gómez, H; Guillon, B; Guzowski, P; Hodak, R; Huber, A; Hubert, P; Hugon, C; Jullian, S; Klimenko, A; Kochetov, O; Konovalov, S I; Kovalenko, V; Lalanne, D; Lang, K; Lemière, Y; T Le Noblet; Liptak, Z; Liu, X R; Loaiza, P; Lutter, G; Mamedov, F; Marquet, C; Mauger, F; Minotti, A; Morgan, B; Mott, J; Nemchenok, I; Nomachi, M; Nova, F; Nowacki, F; Oliviéro, G; Pahlka, R B; Palusova, V; Patrick, C; Perrot, F; Pin, A; Piquemal, F; Povinec, P; Přidal, P; Ramachers, Y A; Remoto, A; Reyss, J L; Richards, B; Riddle, C L; Rukhadze, E; Salazar, R; Sarazin, X; Sedgbeer, J; Yu Shitov; Simard, L; Simkovic, F; Smetana, A; Smolek, K; Smolnikov, A; Soulé, B; Štekl, I; Suhonen, J; Sutton, C S; Szklarz, G; Tedjditi, H; Thomas, J; Timkin, V; Torre, S; Tretyak, Vl I; Tretyak, V I; Vanushin, I; Vilela, C; Vorobela, V; Waters, D; Žukauskas, A

    arXiv.org, 01/2020
    Paper, Journal Article

    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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