/ hep-ex arXiv:1610.03226


Measurement of the $2\nu\beta\beta$ Decay Half-Life and Search for the $0\nu\beta\beta$ Decay of $^{116}$Cd with the NEMO-3 Detector


Arnold, R. (Strasbourg, IPHC) ; Augier, C. (Orsay, LAL) ; Baker, J.D. (Idaho Natl. Lab.) ; Barabash, A.S. (Kurchatov Inst., Moscow) ; Basharina-Freshville, A. (University Coll. London) ; Blondel, S. (Orsay, LAL) ; Blot, S. (Manchester U.) ; Bongrand, M. (Orsay, LAL) ; Brudanin, V. (Moscow Phys. Eng. Inst.) ; Busto, J. (Marseille, CPPM) ; Caffrey, A.J. (Idaho Natl. Lab.) ; Calvez, S. (Orsay, LAL) ; Cerna, C. (CENBG, Gradignan) ; Cesar, J.P. (Texas U.) ; Chapon, A. (Caen U.) ; Chauveau, E. (Manchester U.) ; Duchesneau, D. (Annecy, LAPP) ; Durand, D. (Caen U.) ; Egorov, V. (Dubna, JINR) ; Eurin, G. (University Coll. London) ; Evans, J.J. (Manchester U.) ; Fajt, L. (IEAP CTU, Prague) ; Filosofov, D. (Dubna, JINR) ; Flack, R. (University Coll. London) ; Garrido, X. (Orsay, LAL) ; Gómez, H. (Orsay, LAL) ; Guillon, B. (Caen U.) ; Guzowski, P. (Manchester U.) ; Hodák, R. (Kiel U.) ; Huber, A. (CENBG, Gradignan) ; Hubert, P. (CENBG, Gradignan) ; Hugon, C. (CENBG, Gradignan) ; Jullian, S. (Orsay, LAL) ; Klimenko, A. (Dubna, JINR) ; Kochetov, O. (Dubna, JINR) ; Konovalov, S.I. (Kurchatov Inst., Moscow) ; Kovalenko, V. (Dubna, JINR) ; Lalanne, D. (Orsay, LAL) ; Lang, K. (Texas U.) ; Lemière, Y. (Caen U.) ; Le Noblet, T. (Annecy, LAPP) ; Liptak, Z. (Texas U.) ; Loaiza, P. (Orsay, LAL) ; Lutter, G. (CENBG, Gradignan) ; Mamedov, F. (Kiel U.) ; Marquet, C. (CENBG, Gradignan) ; Mauger, F. (Caen U.) ; Morgan, B. (Warwick U.) ; Mott, J. (University Coll. London) ; Nemchenok, I. (Dubna, JINR) ; Nomachi, M. (Osaka U.) ; Nova, F. (Texas U.) ; Nowacki, F. (Strasbourg, IPHC) ; Ohsumi, H. (Saga U., Japan) ; Pahlka, R.B. (Texas U.) ; Perrot, F. (CENBG, Gradignan) ; Piquemal, F. (Modane, Lab. Souterrain) ; Povinec, P. (Comenius U.) ; Přidal, P. (IEAP CTU, Prague) ; Ramachers, Y.A. (Warwick U.) ; Remoto, A. (Annecy, LAPP) ; Reyss, J.L. (LSCE, Gif-sur-Yvette) ; Richards, B. (University Coll. London) ; Riddle, C.L. (Idaho Natl. Lab.) ; Rukhadze, E. (Kiel U.) ; Saakyan, R. (University Coll. London) ; Salazar, R. (Texas U.) ; Sarazin, X. (Orsay, LAL) ; Shitov, Yu. (Imperial Coll., London) ; Simard, L. (Inst. U. de France) ; F.Šimkovic (Comenius U.) ; Smetana, A. (Kiel U.) ; Smolek, K. (Kiel U.) ; Smolnikov, A. (Dubna, JINR) ; Söldner-Rembold, S. (Manchester U.) ; Soulé, B. (CENBG, Gradignan) ; Štekl, I. (IEAP CTU, Prague) ; Suhonen, J. (Jyvaskyla U.) ; Sutton, C.S. (Unlisted) ; Szklarz, G. (Orsay, LAL) ; Thomas, J. (University Coll. London) ; Timkin, V. (Dubna, JINR) ; Torre, S. (University Coll. London) ; Tretyak, Vl.I. (Kiev, INR) ; Tretyak, V.I. (Dubna, JINR) ; Umatov, V.I. (Kurchatov Inst., Moscow) ; Vanushin, I. (Kurchatov Inst., Moscow) ; Vilela, C. (University Coll. London) ; Vorobel, V. (Charles U.) ; Waters, D. (University Coll. London) ; Žukauskas, A. (Charles U.)

Pages: 11

Abstract: The NEMO-3 experiment measured the half-life of the $2\nu\beta\beta$ decay and searched for the $0\nu\beta\beta$ decay of $^{116}$Cd. Using $410$ g of $^{116}$Cd installed in the detector with an exposure of $5.26$ y, ($4968\pm74$) events corresponding to the $2\nu\beta\beta$ decay of $^{116}$Cd to the ground state of $^{116}$Sn have been observed with a signal to background ratio of about $12$. The half-life of the $2\nu\beta\beta$ decay has been measured to be $ T_{1/2}^{2\nu}=[2.74\pm0.04\mbox{(stat.)}\pm0.18\mbox{(syst.)}]\times10^{19}$ y. No events have been observed above the expected background while searching for $0\nu\beta\beta$ decay. The corresponding limit on the half-life is determined to be $T_{1/2}^{0\nu} \ge 1.0 \times 10^{23}$ y at the $90$ % C.L. which corresponds to an upper limit on the effective Majorana neutrino mass of $\langle m_{\nu} \rangle \le 1.4-2.5$ eV depending on the nuclear matrix elements considered. Limits on other mechanisms generating $0\nu\beta\beta$ decay such as the exchange of R-parity violating supersymmetric particles, right-handed currents and majoron emission are also obtained.

Web-Page: http://inspirehep.net/record/1491177/files/Fig8.png; http://inspirehep.net/record/1491177/files/Fig4.png; http://inspirehep.net/record/1491177/files/Fig10.png; http://inspirehep.net/record/1491177/files/Fig3.png; http://inspirehep.net/record/1491177/files/Fig6left.png; http://inspirehep.net/record/1491177/files/Fig9.png; http://inspirehep.net/record/1491177/files/Fig7left.png; http://inspirehep.net/record/1491177/files/Fig6right.png; http://inspirehep.net/record/1491177/files/Fig7right.png; http://inspirehep.net/record/1491177/files/Fig2.png; http://inspirehep.net/record/1491177/files/Fig5.png; http://inspirehep.net/record/1491177/files/Fig1.png; http://inspirehep.net/record/1491177/files/arXiv:1610.03226.pdf

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