Final results on 82Se double beta decay to the ground state of 82Kr from the NEMO-3 experiment

R. Arnold, C. Augier, A. S. Barabash, A. Basharina-Freshville, S. Blondel, S. Blot, M. Bongrand, D. Boursette, 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. DuchesneauD. Durand, V. Egorov, G. Eurin, J. J. Evans, L. Fajt, D. Filosofov, R. Flack, X. Garrido, H. Gómez, B. Guillon, P. Guzowski, R. Hodák, 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, C. Macolino, F. Mamedov

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    Using data from the NEMO-3 experiment, we have measured the two-neutrino double beta decay (2 νββ) half-life of 82Se as T1/22ν=[9.39±0.17(stat)±0.58(syst)]×1019 y under the single-state dominance hypothesis for this nuclear transition. The corresponding nuclear matrix element is |M2 ν| = 0.0498 ± 0.0016. In addition, a search for neutrinoless double beta decay (0 νββ) using 0.93 kg of 82Se observed for a total of 5.25 y has been conducted and no evidence for a signal has been found. The resulting half-life limit of T1/20ν>2.5×1023y(90%C.L.) for the light neutrino exchange mechanism leads to a constraint on the effective Majorana neutrino mass of ⟨mν⟩<(1.2-3.0)eV, where the range reflects 0 νββ nuclear matrix element values from different calculations. Furthermore, constraints on lepton number violating parameters for other 0 νββ mechanisms, such as right-handed currents, majoron emission and R-parity violating supersymmetry modes have been set.

    Original languageEnglish
    Article number821
    JournalEuropean Physical Journal C
    Issue number10
    Early online date11 Oct 2018
    Publication statusPublished - 11 Oct 2018


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