Journal Article

Measurement of the double-β decay of 150Nd to the 01+ excited state of 150Sm in NEMO-3

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

2023

Overview

The NEMO-3 results for the double- β decay of 150 Nd to the 0 1 + and 2 1 + excited states of 150 Sm are reported. The data recorded during 5.25 year with 36.6 g of the isotope 150 Nd are used in the analysis. The signal of the 2 ν β β transition to the 0 1 + excited state is detected with a statistical significance exceeding 5 σ . The half-life is measured to be T 1 / 2 2 ν β β ( 0 1 + ) = 1 . 11 - 0.14 + 0.19 stat - 0.15 + 0.17 syst × 10 20  year, which is the most precise value that has been measured to date. 90% confidence-level limits are set for the other decay modes. For the 2 ν β β decay to the 2 1 + level the limit is T 1 / 2 2 ν β β ( 2 1 + ) > 2.42 × 10 20 year . The limits on the 0 ν β β decay to the 0 1 + and 2 1 + levels of 150 Sm are significantly improved to T 1 / 2 0 ν β β ( 0 1 + ) > 1.36 × 10 22 year and T 1 / 2 0 ν β β ( 2 1 + ) > 1.26 × 10 22 year .

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Astronomy / Astrophysics and Cosmology / Confidence intervals / Decay / Elementary Particles / Excitation / Hadrons / Heavy Ions / Measurement Science and Instrumentation / Neutrinos / Nuclear Energy / Nuclear Physics / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Regular Article - Experimental Physics / Sensors / Statistical analysis / String Theory