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Measurement of the Double-Beta Decay Half-Life and Search for the Neutrinoless Double-Beta Decay of $^{48}{\rm Ca}$ 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 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 V. Egorov G. Eurin 2 J. j. Evans L. Fajt D. Filosofov R. Flack X. Garrido 2 H. Gómez 7 B. Guillon 5 P. Guzowski R. Hodák A. Huber P. Hubert C. Hugon Sophie Jullian A. Klimenko O. Kochetov S. i. Konovalov V. Kovalenko D. Lalanne K. Lang V. i. Lebedev Y. Lemière 5 T. Le Noblet 6 Z. Liptak X. r. Liu 2 P. Loaiza 2 G. Lutter 4 F. Mamedov Catherine Marquet 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, 8 P. Povinec P. Přidal Y. a. Ramachers A. Remoto 6 J. l. Reyss 9, 10 B. Richards C. l. Riddle E. Rukhadze N. i. Rukhadze R. Saakyan R. Salazar X. Sarazin 2 Yu. Shitov L. Simard 2 F. Šimkovic A. Smetana K. Smolek A. Smolnikov S. Söldner-Rembold B. Soulé 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 has investigated the double-$\beta$ decay of $^{48}{\rm Ca}$. Using $5.25$ yr of data recorded with a $6.99\,{\rm g}$ sample of $^{48}{\rm Ca}$, approximately $150$ double-$\beta$ decay candidate events have been selected with a signal-to-background ratio greater than $3$. The half-life for the two-neutrino double-$\beta$ decay of $^{48}{\rm Ca}$ has been measured to be $T^{2\nu}_{1/2}\,=\,[6.4\, ^{+0.7}_{-0.6}{\rm (stat.)} \, ^{+1.2}_{-0.9}{\rm (syst.)}] \times 10^{19}\,{\rm yr}$. A search for neutrinoless double-$\beta$ decay of $^{48}{\rm Ca}$ yields a null result and a corresponding lower limit on the half-life is found to be $T^{0\nu}_{1/2} > 2.0 \times 10^{22}\,{\rm yr}$ at $90\%$ confidence level, translating into an upper limit on the effective Majorana neutrino mass of $< m_{\beta\beta} > < 6.0 - 26$ ${\rm eV}$, 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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Submitted on : Friday, April 8, 2016 - 11:43:30 AM
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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 $^{48}{\rm Ca}$ with the NEMO-3 Detector. Physical Review D, American Physical Society, 2016, 93, pp.112008. ⟨10.1103/PhysRevD.93.112008⟩. ⟨in2p3-01299739⟩



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