New Limit for Neutrinoless Double-Beta Decay of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Mo</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>100</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> from the CUPID-Mo Experiment
E. Armengaud, C. Augier, A. S. Barabash, F. Bellini, G. Benato, A. Benoı̂t, M. Beretta, L. Bergé, J. Billard, Yu. A. Borovlev, C. Bourgeois, V. Brudanin, P. Camus, L. Cardani, N. Casali, A. Cazes, M. Chapellier, F. Charlieux, D. Chiesa, M. de Combarieu, I. Dafinei, F.A. Danevich, M. De Jésus, T. Dixon, L. Dumoulin, K. Eitel, F. Ferri, B. K. Fujikawa, J. Gascon, L. Gironi, A. Giuliani, V. D. Grigorieva, M. Gros, C. Guérard, D. Helis, H. Z. Huang, R.G. Huang, J. Johnston, A. Juillard, H. Khalife, M. Kleifges, V. Kobychev, Yu.G. Kolomensky, С. И. Коновалов, A. Leder, P. Loaiza, L. Ma, E. P. Makarov, P. de Marcillac, R. Mariam, L. Marini, S. Marnieros, D. Misiak, X.-F. Navick, C. Nones, E. B. Norman, V. Novati, E. Olivieri, J. L. Ouellet, L. Pagnanini, P. Pari, L. Pattavina, B. Paul, M. Pavan, H. Peng, G. Pessina, S. Pirro, D. V. Poda, O. G. Polischuk, S. Pozzi, E. Previtali, T. Redon, A. Rojas, S. Rozov, C. Rusconi, V. Sanglard, J. A. Scarpaci, K. Schäffner, B. Schmidt, Yang Shen, V.N. Shlegel, B. Siebenborn, V. Singh, C. Tomei, V. I. Tretyak, V. I. Umatov, L. Vagneron, M. Velázquez, B. Welliver, L. A. Winslow, M. Xue, E. Yakushev, M. M. Zarytskyy, A. Zolotarova
Abstract
The CUPID-Mo experiment at the Laboratoire Souterrain de Modane (France) is a demonstrator for CUPID, the next-generation ton-scale bolometric $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ experiment. It consists of a 4.2 kg array of 20 enriched ${\mathrm{Li}}_{2}$$^{100}\mathrm{Mo}{\mathrm{O}}_{4}$ scintillating bolometers to search for the lepton-number-violating process of $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay in $^{100}\mathrm{Mo}$. With more than one year of operation ($^{100}\mathrm{Mo}$ exposure of $1.17\text{ }\text{ }\mathrm{kg}\ifmmode\times\else\texttimes\fi{}\mathrm{yr}$ for physics data), no event in the region of interest and, hence, no evidence for $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ is observed. We report a new limit on the half-life of $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay in $^{100}\mathrm{Mo}$ of ${T}_{1/2}>1.5\ifmmode\times\else\texttimes\fi{}{10}^{24}\text{ }\text{ }\mathrm{yr}$ at 90% C.I. The limit corresponds to an effective Majorana neutrino mass $⟨{m}_{\ensuremath{\beta}\ensuremath{\beta}}⟩<(0.31--0.54)\text{ }\mathrm{eV}$, dependent on the nuclear matrix element in the light Majorana neutrino exchange interpretation.