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Measurement of the 2νββ decay half-life and search for the 0νββ decay of Cd116 with the NEMO-3 detector

Physical review. D/Physical review. D.2017Vol. 95(1)

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R. Arnold, C. Augier, Joy Don Baker, A. S. Barabash, A. Basharina-Freshville, Sophie Blondel, Summer 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, 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, С. И. Коновалов, V. Kovalenko, D. Lalanne, K. Lang, Y. Lemière, T. Le Noblet, Z. Liptak, X. R. Liu, P. Loaiza, G. Lutter, M. Macko, C. Macolino, F. Mamedov, Ch. Marquet, F. Mauger, B. Morgan, J. Mott, I. Nemchenok, M. Nomachi, F. Nova, F. Nowacki, H. Ohsumi, R. B. Pahlka, F. Perrot, F. Piquemal, Pavel P. Povinec, P. Přidal, Y. A. Ramachers, A. Remoto, J.L. Reyss, B. Richards, C. L. Riddle, E. Rukhadze, R. Saakyan, R. Salazar, X. Sarazin, Yu. Shitov, L. Simard, F. Šimkovic, Adam 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, A. Žukauskas

Abstract

The NEMO-3 experiment measured the half-life of the $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay and searched for the $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay of $^{116}\mathrm{Cd}$. Using 410 g of $^{116}\mathrm{Cd}$ installed in the detector with an exposure of 5.26 y, ($4968\ifmmode\pm\else\textpm\fi{}74$) events corresponding to the $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay of $^{116}\mathrm{Cd}$ to the ground state of $^{116}\mathrm{Sn}$ have been observed with a signal to background ratio of about 12. The half-life of the $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay has been measured to be ${T}_{1/2}^{2\ensuremath{\nu}}=[2.74\ifmmode\pm\else\textpm\fi{}0.04(\text{stat})\ifmmode\pm\else\textpm\fi{}0.18(\text{syst})]\ifmmode\times\else\texttimes\fi{}1{0}^{19}\text{ }\text{ }\mathrm{y}$. No events have been observed above the expected background while searching for $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay. The corresponding limit on the half-life is determined to be ${T}_{1/2}^{0\ensuremath{\nu}}\ensuremath{\ge}1.0\ifmmode\times\else\texttimes\fi{}1{0}^{23}\text{ }\text{ }\mathrm{y}$ at the 90% C.L. which corresponds to an upper limit on the effective Majorana neutrino mass of $⟨{m}_{\ensuremath{\nu}}⟩\ensuremath{\le}1.4--2.5\text{ }\text{ }\mathrm{eV}$ depending on the nuclear matrix elements considered. Limits on other mechanisms generating $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay such as the exchange of R-parity violating supersymmetric particles, right-handed currents and majoron emission are also obtained.

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Abstract

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