/ hep-ex arXiv:1506.05825

Result of the search for neutrinoless double-$\beta$ decay in $^{100}$Mo with the NEMO-3 experiment

Arnold, R. (Strasbourg, IPHC) ; Augier, C. (Orsay) ; Baker, J.D. (Idaho Natl. Lab.) ; Barabash, A.S. (Moscow, ITEP) ; Basharina-Freshville, A. (University Coll. London) ; Blondel, S. (Orsay) ; Blot, S. (Manchester U.) ; Bongrand, M. (Orsay) ; Brudanin, V. (Dubna, JINR) ; Busto, J. (Marseille, CPPM) ; Caffrey, A.J. (Idaho Natl. Lab.) ; Cerna, C. (CENBG, Gradignan) ; Chapon, A. (Caen U.) ; Chauveau, E. (Manchester U.) ; Duchesneau, D. (Savoie U.) ; 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) ; Gomez, H. (Orsay) ; Guillon, B. (Caen U.) ; Guzowski, P. (Manchester U.) ; Hodak, R. (IEAP CTU, Prague) ; Hubert, P. (CENBG, Gradignan) ; Hugon, C. (CENBG, Gradignan) ; Jullian, S. (Orsay) ; Klimenko, A. (Dubna, JINR) ; Kochetov, O. (Dubna, JINR) ; Konovalov, S.I. (Moscow, ITEP) ; Kovalenko, V. (Dubna, JINR) ; Lalanne, D. (Orsay) ; Lang, K. (Texas U.) ; Lemiere, Y. (Caen U.) ; Liptak, Z. (Texas U.) ; Loaiza, P. (Modane, Lab. Souterrain) ; Lutter, G. (CENBG, Gradignan) ; Mamedov, F. (IEAP CTU, Prague) ; 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.) ; Pridal, P. (IEAP CTU, Prague) ; Ramachers, Y.A. (Warwick U.) ; Remoto, A. (Savoie U.) ; Reyss, J.L. (LSCE, Gif-sur-Yvette) ; Richards, B. (University Coll. London) ; Riddle, C.L. (Idaho Natl. Lab.) ; Rukhadze, E. (IEAP CTU, Prague) ; Saakyan, R. (University Coll. London) ; Sarazin, X. (Orsay) ; Shitov, Yu. (Imperial Coll., London) ; Simard, L. (Orsay) ; Simkovic, F. (Comenius U.) ; Smetana, A. (IEAP CTU, Prague) ; Smolek, K. (IEAP CTU, Prague) ; Smolnikov, A. (Dubna, JINR) ; Soldner-Rembold, S. (Manchester U.) ; Soule, B. (CENBG, Gradignan) ; Stekl, I. (IEAP CTU, Prague) ; Suhonen, J. (Jyvaskyla U.) ; Sutton, C.S. (Mt. Holyoke Coll.) ; Szklarz, G. (Orsay) ; Thomas, J. (University Coll. London) ; Timkin, V. (Dubna, JINR) ; Torre, S. (University Coll. London) ; Tretyak, Vl.I. (Moscow, INR) ; Tretyak, V.I. (Dubna, JINR) ; Umatov, V.I. (Moscow, ITEP) ; Vanushin, I. (Moscow, ITEP) ; Vilela, C. (University Coll. London) ; Vorobel, V. (Charles U.) ; Waters, D. (University Coll. London) ; Zukauskas, A. (Charles U.)

Abstract: The NEMO-3 detector, which had been operating in the Modane Underground Laboratory from 2003 to 2010, was designed to search for neutrinoless double $\beta$ ($0\nu\beta\beta$) decay. We report final results of a search for $0\nu\beta\beta$ decays with $6.914$ kg of $^{100}$Mo using the entire NEMO-3 data set with a detector live time of $4.96$ yr, which corresponds to an exposure of 34.3 kg$\cdot$yr. We perform a detailed study of the expected background in the $0\nu\beta\beta$ signal region and find no evidence of $0\nu\beta\beta$ decays in the data. The level of observed background in the $0\nu\beta\beta$ signal region $[2.8-3.2]$ MeV is $0.44 \pm 0.13$ counts/yr/kg, and no events are observed in the interval $[3.2-10]$ MeV. We therefore derive a lower limit on the half-life of $0\nu\beta\beta$ decays in $^{100}$Mo of $T_{1/2}(0\nu\beta\beta)> 1.1 \times 10^{24}$ yr at the $90\%$ Confidence Level, under the hypothesis of light Majorana neutrino exchange. Depending on the model used for calculating nuclear matrix elements, the limit for the effective Majorana neutrino mass lies in the range $\langle m_{\nu} \rangle < 0.33$--$0.62$ eV. We also report constraints on other lepton-number violating mechanisms for $0\nu\beta\beta$ decays.

Web-Page: http://inspirehep.net/record/1377198/files/rnmodel_article_low_cut0.png; http://inspirehep.net/record/1377198/files/fig_ealpha_laser_test.png; http://inspirehep.net/record/1377198/files/schema_bkg_2.png; http://inspirehep.net/record/1377198/files/mo_ep_sum_etot_2.png; http://inspirehep.net/record/1377198/files/calo_laser_corr.png; http://inspirehep.net/record/1377198/files/evt_0nu_small_2.png; http://inspirehep.net/record/1377198/files/resol7_sigma.png; http://inspirehep.net/record/1377198/files/probint.png; http://inspirehep.net/record/1377198/files/deltat.png; http://inspirehep.net/record/1377198/files/desin_bi214.png; http://inspirehep.net/record/1377198/files/desin_tl208.png; http://inspirehep.net/record/1377198/files/nemo3_layout.png; http://inspirehep.net/record/1377198/files/bi207_5006_log.png; http://inspirehep.net/record/1377198/files/rnmodel_dtime_low_cut3.png; http://inspirehep.net/record/1377198/files/rnmodel_dtime_high_cut1.png; http://inspirehep.net/record/1377198/files/pict_mo100_etot_p1.png; http://inspirehep.net/record/1377198/files/current-limits-gemotexe.png; http://inspirehep.net/record/1377198/files/pict_mo100_etot_p2.png; http://inspirehep.net/record/1377198/files/pict_mo100_etot_sum.png; http://inspirehep.net/record/1377198/files/calo_dead_pm.png; http://inspirehep.net/record/1377198/files/tl208-engamma-mocomp.png; http://inspirehep.net/record/1377198/files/ext_bkg_ecrossing_phase1.png; http://inspirehep.net/record/1377198/files/ext_bkg_ecrossing_phase2.png; http://inspirehep.net/record/1377198/files/tl208-engamma-mometal.png; http://inspirehep.net/record/1377198/files/pict_te_cu_etot_p2.png; http://inspirehep.net/record/1377198/files/pict_te_cu_etot_p1.png; http://inspirehep.net/record/1377198/files/pict_te_cu_etot_sum.png; http://inspirehep.net/record/1377198/files/mo_met_al.png; http://inspirehep.net/record/1377198/files/schema_ext_bkg.png; http://inspirehep.net/record/1377198/files/ext_bkg_egamma_phase1.png; http://inspirehep.net/record/1377198/files/ext_bkg_egamma_phase2.png; http://inspirehep.net/record/1377198/files/mo_com_al.png; http://inspirehep.net/record/1377198/files/schema_bkg_1.png; http://inspirehep.net/record/1377198/files/mo100_bbng_e2e.png; http://inspirehep.net/record/1377198/files/arXiv:1506.05825.pdf

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