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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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Details
1 IPHC, ULP, CNRS/IN2P3, Strasbourg, France
2 LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France
3 NRC “Kurchatov Institute”, ITEP, Moscow, Russia
4 UCL, London, UK
5 University of Manchester, Manchester, UK
6 JINR, Dubna, Russia; National Research Nuclear University MEPhI, Moscow, Russia
7 Aix Marseille Université, CNRS, CPPM, Marseille, France
8 Idaho National Laboratory, Idaho Falls, ID, USA
9 CENBG, Université de Bordeaux, CNRS/IN2P3, Gradignan, France
10 University of Texas at Austin, Austin, TX, USA
11 LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, Caen, France
12 LAPP, Université de Savoie, CNRS/IN2P3, Annecy-le-Vieux, France
13 JINR, Dubna, Russia; FMFI, Comenius University, Bratislava, Slovakia
14 JINR, Dubna, Russia
15 LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France; UCL, London, UK
16 Institute of Experimental and Applied Physics, Czech Technical University in Prague, Prague, Czech Republic
17 CENBG, Université de Bordeaux, CNRS/IN2P3, Gradignan, France; Institute of Experimental and Applied Physics, Czech Technical University in Prague, Prague, Czech Republic
18 University of Warwick, Coventry, UK
19 UCL, London, UK; Present Address: Boston University, Boston, MA, USA
20 Osaka University, Osaka, Japan
21 Saga University, Saga, Japan
22 CENBG, Université de Bordeaux, CNRS/IN2P3, Gradignan, France; Laboratoire Souterrain de Modane, Modane, France
23 FMFI, Comenius University, Bratislava, Slovakia
24 LSCE, CNRS, Gif-sur-Yvette, France
25 Imperial College London, London, UK
26 LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France; Institut Universitaire de France, Paris, France
27 Jyväskylä University, Jyvaskyla, Finland
28 MHC, South Hadley, MA, USA
29 Institute for Nuclear Research, Kiev, Ukraine
30 Faculty of Mathematics and Physics, Charles University in Prague, Prague, Czech Republic