Detailed studies of $^{100}$Mo two-neutrino double beta decay in NEMO-3

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 R. Dvornický V. Egorov G. Eurin 2 J.J. Evans L. Fajt D. Filosofov R. Flack X. Garrido 2 C. Girard-Carillo 2 H. Gómez 2 B. Guillon 5 P. Guzowski R. Hodák A. Huber 4 P. Hubert 4 C. Hugon 4 S. Jullian 2 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 M. Macko 4 C. Macolino 2 F. Mamedov C. Marquet 4 F. Mauger 5 A. Minotti 6 B. Morgan J. Mott I. Nemchenok M. Nomachi F. Nova F. Nowacki 1 H. Ohsumi G. Oliviéro 5 R.B. Pahlka C. Patrick F. Perrot 4 A. Pin 4 F. Piquemal 4, 7 P. Povinec P. Pridal Y.A. Ramachers A. Remoto 6 J.L. Reyss 8 C.L. Riddle E. Rukhadze R. Saakyan A. Salamatin R. Salazar X. Sarazin 2 J. Sedgbeer Yu. Shitov L. Simard 2 F. Simkovic A. Smetana K. Smolek A. Smolnikov S. Söldner-Rembold B. Soulé 4 I. Stekl J. Suhonen C.S. Sutton G. Szklarz 2 H. Tedjditi 3 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. Zukauskas
Abstract : The full data set of the NEMO-3 experiment has been used to measure the half-life of the two-neutrino double beta decay of$^{100}$ Mo to the ground state of$^{100}$ Ru, $T_{1/2} = \left[ 6.81 \pm 0.01\,\left( \text{ stat }\right) ^{+0.38-0.40}\,\left( \text{ syst }\right) \right] \times 10^{18}$  year. The two-electron energy sum, single electron energy spectra and distribution of the angle between the electrons are presented with an unprecedented statistics of $5\times 10^5$ events and a signal-to-background ratio of $\sim $ 80. Clear evidence for the Single State Dominance model is found for this nuclear transition. Limits on Majoron emitting neutrinoless double beta decay modes with spectral indices of $\mathrm{n}=2,3,7$ , as well as constraints on Lorentz invariance violation and on the bosonic neutrino contribution to the two-neutrino double beta decay mode are obtained.
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R. Arnold, C. Augier, A.S. Barabash, A. Basharina-Freshville, S. Blondel, et al.. Detailed studies of $^{100}$Mo two-neutrino double beta decay in NEMO-3. Eur.Phys.J.C, 2019, 79 (5), pp.440. ⟨10.1140/epjc/s10052-019-6948-4⟩. ⟨hal-02097242⟩

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