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

R. Arnold 1 C. Augier 2 A.S. Barabash A. Basharina-Freshville S. Blondel 2 S. Blot M. Bongrand 2 D. Boursette 2 V. Brudanin J. Busto 3 A.J. Caffrey S. Calvez 2 M. Cascella C. Cerna 4 J.P. Cesar A. Chapon 5 E. Chauveau 4 A. Chopra L. Dawson D. Duchesneau 6 D. Durand 5 V. Egorov G. Eurin 2 J.J. Evans L. Fajt D. Filosofov R. Flack X. Garrido 2 H. Gómez 2 B. Guillon 5 P. Guzowski R. Hodák A. Huber 4 P. Hubert 4 C. Hugon 4 S. Jullian 2 A. Klimenko O. Kochetov S.I. Konovalov V. Kovalenko D. Lalanne 2 K. Lang Y. Lemière 5 T. Le Noblet 6 Z. Liptak X.R. Liu P. Loaiza 2 G. Lutter 4 C. Macolino 2 F. Mamedov C. Marquet 4 F. Mauger 5 B. Morgan J. Mott I. Nemchenok M. Nomachi F. Nova F. Nowacki 1 H. Ohsumi R.B. Pahlka C. Patrick F. Perrot 4 F. Piquemal 4, 7 P. Povinec P. Přidal Y.A. Ramachers A. Remoto 6 J.L. Reyss 8 C.L. Riddle E. Rukhadze N.I. Rukhadze R. Saakyan R. Salazar X. Sarazin 2 Yu. Shitov L. Simard 2 F. Šimkovic A. Smetana K. Smolek A. Smolnikov S. Söldner-Rembold B. Soulé 4 I. Štekl J. Suhonen C.S. Sutton G. Szklarz 2 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
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 $T_{\smash {1/2}}^{2\nu } \!=\! \left[ 9.39 \pm 0.17\left( \text{ stat }\right) \pm 0.58\left( \text{ syst }\right) \right] \times 10^{19}$  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 $T_{1/2}^{0\nu } > 2.5 \times 10^{23} \,\text{ y } \,(90\%\,\text{ C.L. })$ for the light neutrino exchange mechanism leads to a constraint on the effective Majorana neutrino mass of $\langle m_{\nu } \rangle < \left( 1.2{-}3.0\right) \,\text{ eV }$ , 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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Submitted on : Monday, July 2, 2018 - 9:16:43 PM
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R. Arnold, C. Augier, A.S. Barabash, A. Basharina-Freshville, S. Blondel, et al.. Final results on $^{82}{Se}$ double beta decay to the ground state of $^{82}{Kr}$ from the NEMO-3 experiment. Eur.Phys.J.C, 2018, 78 (10), pp.821. ⟨10.1140/epjc/s10052-018-6295-x⟩. ⟨hal-01827977⟩

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