Author: Arnold, R. ; Augier, C. ; Bakalyarov, A. M. ; Baker, J. D. ; Barabash, A. S. ; Basharina-Freshville, A. ; Blondel, S. ; Blot, S. ; Bongrand, M. ; Brudanin, V. ; Busto, J. ; Caffrey, A. J. ; Calvez, S. ; Cascella, M. ; Cerna, C. ; Cesar, J. P. ; Chapon, A. ; Chauveau, E. ; Chopra, A. ; Duchesneau, D. ; Durand, D. ; Egorov, V. ; Eurin, G. ; Evans, J. J. ; Fajt, L. ; Filosofov, D. ; Flack, R. ; Garrido, X. ; Gomez, H. ; Guillon, B. ; Guzowski, P. ; Hodak, R. ; Huber, A. ; Hubert, P. ; Hugon, C. ; Jullian, S. ; Klimenko, A. ; Kochetov, O. ; Konovalov, S. I. ; Kovalenko, V. ; Lalanne, D. ; Lang, K. ; Lebedev, V. I. ; Lemiere, Y. ; Le Noblet, T. ; Liptak, Z. ; Liu, X. R. ; Loaiza, P. ; Lutter, G. ; Mamedov, F. ; Marquet, C. ; Mauger, F. ; Morgan, B. ; Mott, J. ; Nemchenok, I. ; Nomachi, M. ; Nova, F. ; Nowacki, F. ; Ohsumi, H. ; Pahlka, R. B. ; Perrot, F. ; Piquemal, F. ; Povinec, P. ; Pridal, P. ; Ramachers, Y. A. ; Remoto, A. ; Reyss, J. L. ; Richards, B. ; Riddle, C. L. ; Rukhadze, E. ; Rukhadze, N. I. ; Saakyan, R. ; Salazar, R. ; Sarazin, X. ; Shitov, Yu. ; Simard, L. ; Simkovic, F. ; Smetana, A. ; Smolek, K. ; Smolnikov, A. ; Soldner-Rembold, S. ; Soule, B. ; Stekl, I. ; Suhonen, J. ; Sutton, C. S. ; Szklarz, G. ; Thomas, J. ; Timkin, V. ; Torre, S. ; Tretyak, Vl. I. ; Tretyak, V. I. ; Umatov, V. I. ; Vanushin, I. ; Vilela, C. ; Vorobel, V. ; Waters, D. ; Zhukov, S. V. ; Zukauskas, A.
The NEMO-3 experiment at the Modane Underground Laboratory investigates the double-beta decay of 48Ca. Using 5.25 yr of data recorded with a 6.99 g sample of 48Ca, approx. 150 double-beta decay candidate events are selected with a signal-to-background ratio greater than 3. The half-life for the two-neutrino double-beta decay of 48Ca is measured to be T2ν1/2 = [6.4+0.7-0.6(stat)+1.2-0.9(syst)] × 1019 yr. A search for neutrinoless double-beta decay of 48Ca yields a null result, and a corresponding lower limit on the half-life is found to be T0ν1/2 > 2.0 × 1022 yr at 90% confidence level, translating into an upper limit on the effective Majorana neutrino mass of 〈mββ〉 < 6.0-26 eV, with the range reflecting different nuclear matrix element calculations Limits are also set on models involving Majoron emission and right-handed currents.