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Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay of 48Ca with the NEMO-3 detector

R. Arnold 1 C. Augier 2 A. M. Bakalyarov J. D. Baker A. S. Barabash A. Basharina-Freshville S. Blondel 2 S. Blot M. Bongrand 2 V. Brudanin J. Busto 3 A. J. Caffrey S. Calvez 2 M. Cascella C. Cerna 4 J. P. Cesar A. Chapon 5 E. Chauveau A. Chopra D. Duchesneau 6 D. Durand 5 V. Egorov G. Eurin 2 J. J. Evans L. Fajt D. Filosofov R. Flack X. Garrido 2 H. Gómez 2 B. Guillon 5 P. Guzowski R. Hodák A. Huber 4 P. Hubert 4 C. Hugon 4 S. Jullian 2 A. Klimenko O. Kochetov S. I. Konovalov V. Kovalenko D. Lalanne 2 K. Lang V. I. Lebedev Y. Lemière 5 T. Le Noblet 6 Z. Liptak X. R. Liu P. Loaiza 2 G. Lutter 4 F. Mamedov C. Marquet 4 F. Mauger 5 B. Morgan J. Mott I. Nemchenok M. Nomachi F. Nova F. Nowacki 1 H. Ohsumi R. B. Pahlka F. Perrot 4 F. Piquemal 4, 7 P. Povinec P. Přidal Y. A. Ramachers A. Remoto 6 J. L. Reyss 8 B. Richards C. L. Riddle E. Rukhadze N. I. Rukhadze R. Saakyan R. Salazar X. Sarazin 2 Yu. Shitov L. Simard 9, 2 F. Šimkovic A. Smetana K. Smolek A. Smolnikov S. Söldner-Rembold B. Soulé 4 I. Štekl J. Suhonen C. S. Sutton G. Szklarz 2 J. Thomas V. Timkin S. Torre Vl. I. Tretyak V. I. Tretyak V. I. Umatov I. Vanushin C. Vilela V. Vorobel D. Waters S. V. Zhukov A. Žukauskas 
Abstract : 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, approximately 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 T1/2 2 ν=[6. 4-0.6+0.7(stat)-0.9 +1.2(syst ) ]×1 019 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 T1/2 0 ν>2.0 ×1 022 yr at 90% confidence level, translating into an upper limit on the effective Majorana neutrino mass of ⟨mβ β⟩<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.
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R. Arnold, C. Augier, A. M. Bakalyarov, J. D. Baker, A. S. Barabash, et al.. Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay of 48Ca with the NEMO-3 detector. Physical Review D, American Physical Society, 2016, 93, pp.112008. ⟨10.1103/PhysRevD.93.112008⟩. ⟨insu-03721846⟩

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