학술논문
Measurement of double-$\beta$ decay of $^{150}$Nd to the 0$^+_1$ excited state of $^{150}$Sm in NEMO-3
Document Type
Working Paper
Author
Collaboration, NEMO-3; 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.; Li, P.; 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.; Shitov, Yu.; 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.
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Abstract
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.
Comment: Minor corrections
Comment: Minor corrections