Measurement Of The Double-Beta Decay Half-Life And Search For The Neutrinoless Double-Beta Decay Of Ca-48 With The Nemo-3 Detector

R. Arnold,C. Augier,A. M. Bakalyarov,J. Baker,A. S. Barabash, A. Basharina-Freshville,S. Blondel, S. Blot,M. Bongrand,V. Brudanin,J. Busto,A.J. Caffrey, S. Calvez,M. Cascella,C. Cerna,J. P. Cesar,A. Chapon,E. Chauveau,A. Chopra,D. Duchesneau,D. Durand,V. Egorov,G. Eurin,J. J. Evans,L. Fajt,D. Filosofov,R. L. Flack,X. Garrido,Haley Louise Gomez, B. Guillon,P. Guzowski,R. Hodák,A. Huber,Ph. Hubert,C. Hugon, S. Jullian,A. Klimenko, O. Kochetov,S. I. Konovalov,V. Kovalenko,D. Lalanne, K. Lang, V. i. Lebedev,Y. Lemière,T. Le Noblet,Z. Liptak, X. R. Liu,P. Loaiza,G. Lutter,F. Mamedov,Ch. Marquet, F. Mauger,B. Morgan,J. Mott, I. Nemchenok, M. Nomachi,F. Nova,F. Nowacki,H. Ohsumi,R. B. Pahlka,F. Perrot,F. Piquemal,Pavel P. Povinec,P. Přidal,Y. Ramachers,A. Remoto,J. L. Reyss,B. Richards,C. L. Riddle,E. Rukhadze,N. I. Rukhadze, R. Saakyan,R. Salazar,X. Sarazin,Yu. Shitov, L. Simard,F. Šimkovic,A. Smetana,K. Smolek,A. Smolnikov,S. Söldner-Rembold,B. Soulé,I. Stekl,J. Suhonen,C.S. Sutton,G. Szklarz, J. P. Thomas,V. Timkin,S. Torre, V.I. Tretyak,V. I. Umatov, I. Vanushin,C. Vilela,V. Vorobel,D. Waters, S. V. Zhukov,A. Žukauskas

PHYSICAL REVIEW D（2016）

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摘要

The NEMO-3 experiment at the Modane Underground Laboratory investigates the double-beta decay of Ca-48. Using 5.25 yr of data recorded with a 6.99 g sample of Ca-48, 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 Ca-48 is measured to be T-1/2(2v) = [6.4(-0.6)(+0.7)(stat)(-0.6)(+0.7)(syst)] x 10(19) yr. A search for neutrinoless double-beta decay of Ca-48 yields a null result, and a corresponding lower limit on the half-life is found to be T-1/2(0v) > 2.0 x 10(22) yr at 90% confidence level, translating into an upper limit on the effective Majorana neutrino mass of < m(beta beta)> < 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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