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Committee for collaboration of Czech Republic with Joint Institute for Nuclear Research in Dubna Login
Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay of Ca-48 with the NEMO-3 detector

Author
Arnold R. CNRS, IPHC, University of Strasbourg
Fajt Lukáš, Mgr. Institute of Experimental and Applied Physics CTU
Hodák Rastislav, Mgr. Ph.D. Institute of Experimental and Applied Physics CTU
Mamedov Fadahat, Mgr. Institute of Experimental and Applied Physics CTU
Přidal Petr, Ing. Institute of Experimental and Applied Physics CTU
Rukhadze  Ekaterina, Mgr. Institute of Experimental and Applied Physics CTU
Smetana Adam, Mgr., Ph.D. Institute of Experimental and Applied Physics CTU
Smolek Karel, Ing. Ph.D. Institute of Experimental and Applied Physics CTU
Štekl Ivan, doc. Ing. CSc. Institute of Experimental and Applied Physics CTU
et al.  different institutions

Year
2016

Scientific journal
Physical Review D, 93 (11), 112008

Web


Abstract
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.

Cite article as:
R. Arnold, L. Fajt, R. Hodák, F. Mamedov, P. Přidal, E. Rukhadze , A. Smetana, K. Smolek, I. Štekl, . et al., "Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay of Ca-48 with the NEMO-3 detector", Physical Review D, 93 (11), 112008 (2016)