arXiv · 2001.06388
Search for the double-beta decay of 82Se to the excited states of 82Kr with NEMO-3
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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3 collaboration, C. Augier, A. S. Barabash, A. Basharina-Freshville, S. Blondel, S. Blot, M. Bongrand, D. Boursette, R. Breier, V. Brudanin, J. Busto, A. J. Caffrey, S. Calvez, M. Cascella, C. Cerna, J. P. Cesar, A. Chapon, E. Chauveau, A. Chopra, L. Dawson, D. Duchesneau, D. Durand, V. Egorov, G. Eurin, J. J. Evans, L. Fajt, D. Filosofov, R. Flack, X. Garrido, C. Girard-Carillo, H. Gómez, B. Guillon, P. Guzowski, R. Hodak, A. Huber, P. Hubert, C. Hugon, S. Jullian, A. Klimenko, O. Kochetov, S. I. Konovalov, V. Kovalenko, D. Lalanne, K. Lang, Y. Lemière, T. Le Noblet, Z. Liptak, X. R. Liu, P. Loaiza, G. Lutter, M. Macko, C. Macolino, F. Mamedov, C. Marquet, F. Mauger, A. Minotti, B. Morgan, J. Mott, I. Nemchenok, M. Nomachi, F. Nova, F. Nowacki, H. Ohsumi, G. Oliviéro, R. B. Pahlka, V. Palusova, C. Patrick, F. Perrot, A. Pin, F. Piquemal, P. Povinec, P. Přidal, Y. A. Ramachers, A. Remoto, J. L. Reyss, B. Richards, C. L. Riddle, E. Rukhadze, R. Saakyan, R. Salazar, X. Sarazin, J. Sedgbeer, Yu. Shitov, L. Simard, F. Simkovic, A. Smetana, K. Smolek, A. Smolnikov, S. Söldner-Rembold, B. Soulé, I. Štekl, J. Suhonen, C. S. Sutton, G. Szklarz, H. Tedjditi, J. Thomas, V. Timkin, S. Torre, Vl. I. Tretyak, V. I. Tretyak. 2020-01-17. Search for the double-beta decay of 82Se to the excited states of 82Kr with NEMO-3. https://doi.org/10.1016/j.nuclphysa.2020.121701
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