arXiv · 1806.05553
Final results on $^\textbf{82}$Se double beta decay to the ground state of $^\textbf{82}$Kr from the NEMO-3 experiment
Abstract
Using data from the NEMO-3 experiment, we have measured the two-neutrino double beta decay ($2\nu\beta\beta$) half-life of $^{82}$Se as $T_{1/2}^{2\nu} = \left[ 9.39 \pm 0.17\,\left(\mbox{stat}\right) \pm 0.58\,\left(\mbox{syst}\right)\right] \times 10^{19}$ y under the single-state dominance hypothesis for this nuclear transition. The corresponding nuclear matrix element is $\left|M^{2\nu}\right| = 0.0498 \pm 0.0016$. In addition, a search for neutrinoless double beta decay ($0\nu\beta\beta$) using 0.93 kg of $^{82}$Se 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 $T_{1/2}^{0\nu} > 2.5 \times 10^{23} \,\mbox{y} \,(90\%\,\mbox{C.L.})$ for the light neutrino exchange mechanism leads to a constraint on the effective Majorana neutrino mass of $\langle m_{\nu} \rangle < \left(1.2 - 3.0\right) \,\mbox{eV}$, where the range reflects $0\nu\beta\beta$ nuclear matrix element values from different calculations. Furthermore, constraints on lepton number violating parameters for other $0\nu\beta\beta$ mechanisms, such as right-handed currents, majoron emission and R-parity violating supersymmetry modes have been set.
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3 Collaboration, 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. Duchesneau, D. 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, C. Marquet, F. Mauger, B. Morgan, J. Mott, I. Nemchenok, M. Nomachi, F. Nova, F. Nowacki, H. Ohsumi, R. B. Pahlka, C. Patrick, F. Perrot, F. Piquemal, P. Povinec, P. Přidal, Y. A. Ramachers, A. Remoto, J. L. Reyss, C. L. Riddle, E. Rukhadze, N. I. Rukhadze, R. Saakyan, R. Salazar, X. Sarazin, Yu. Shitov, L. Simard, F. Šimkovic, A. Smetana, K. Smolek, A. Smolnikov, S. Söldner-Rembold, B. Soulé, I. Štekl, J. Suhonen, C. S. Sutton, G. Szklarz, J. Thomas, V. Timkin, S. Torre, Vl. I. Tretyak, V. I. Tretyak, V. I. Umatov, I. Vanushin, C. Vilela, V. Vorobel, D. Waters, F. Xie, A. Žukauskas. 2018-06-14. Final results on $^\textbf{82}$Se double beta decay to the ground state of $^\textbf{82}$Kr from the NEMO-3 experiment. https://arxiv.org/abs/1806.05553
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