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  • NEMO-3 Collaboration; Aguerre, X; Arnold, R; Augier, C; Barabash, A S; Basharina-Freshville, A; Blondel, S; Blot, S; Bongrand, M; Breier, R; Brudanin, V; Busto, J; Bystryakov, A; Caffrey, A J; Cerna, C; Cesar, J P; Ceschia, M; Chauveau, E; Chopra, A; Dawson, L; Duchesneau, D; Durand, D; Evans, J J; Flack, R; Franchini, P; Garrido, X; Girard-Carillo, C; Guillon, B; Guzowski, P; Hoballah, M; Hodák, R; Hubert, P; Hussain, M H; Jullian, S; Klimentko, A; Kochetov, O; Konovalov, S I; Koňařík, F; Křižák, T; Lalanne, D; Lang, K; Lemière, Y; P Li; Loaiza, P; Lutter, G; Macko, M; Mamedov, F; Marquet, C; Mauger, F; Minotti, A; Morgan, B; Nemchenok, I; Nomachi, M; Nowacki, F; Ohsumi, H; Oliviéro, G; Palušová, V; Patrick, C; Perrot, F; Petro, M; Pin, A; Piquemal, F; Povinec, P; Pratt, S; Přidal, P; Quinn, W S; Ramachers, Y A; Remoto, A; Reyss, J L; Riddle, C L; Rukhadze, E; Saakyan, R; Salamatin, A; Salazar, R; Sarazin, X; Sedgbeer, J; Yu Shitov; Simard, L; Šimkovic, F; Smetana, A; Smolnikov, A; Söldner-Rembold, S; Štekl, I; Suhonen, J; Szklarz, G; Tedjditi, H; Thomas, J; Timkin, V; Tretyak, V I; Umatov, V I; Vanushin, I; Vereshchaka, Y; Vorobel, V; Waters, D; Xie, F

    arXiv.org, 08/2023
    Paper

    The NEMO-3 results for the double-\(\beta\) decay of \(^{150}\)Nd to the 0\(^+_1\) and 2\(^+_1\) excited states of \(^{150}\)Sm are reported. The data recorded during 5.25 yr with 36.6 g of the isotope \(^{150}\)Nd are used in the analysis. For the first time, the signal of the \(2\nu\beta\beta\) transition to the 0\(^+_1\) excited state is detected with a statistical significance exceeding 5\(\sigma\). The half-life is measured to be \(T_{1/2}^{2\nu\beta\beta}(0^+_1) = \left 1.11 ^{+0.19}_{-0.14} \,\left(\mbox{stat}\right) ^{+0.17}_{-0.15}\, \left(\mbox{syst}\right) \right \times10^{20}\,\mbox{yr}\). The limits are set on the \(2\nu\beta\beta\) decay to the 2\(^+_1\) level and on the \(0\nu\beta\beta\) decay to the 0\(^+_1\) and 2\(^+_1\) levels of \(^{150}\)Sm.