2016/04/30 by R. Arnold, 3 Collaboration, C. Augier +104 · 3 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ex #nucl-ex #physics.ins-det
paper · pdf · doi:10.1103/physrevd.93.112008
published as Phys. Rev. D 93, 112008 (2016) · 8 pages, 5 figures, 3 tables. Final journal version after peer review
openalex publication_date 2016/06/14 · arxiv created 2016/06/16 · openalex created_date 2016/06/24 · arxiv updated 2016/08/06 · openalex updated_date 2026/08/04
The NEMO-3 experiment at the Modane Underground Laboratory has investigated the double-β 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-β decay candidate events have been selected with a signal-to-background ratio greater than 3. The half-life for the two-neutrino double-β decay of 48\rm Ca has been measured to be T2ν1/2 = [6.4 +0.7-0.6\rm (stat.) +1.2-0.9\rm (syst.)] × 1019 \rm yr. A search for neutrinoless double-β decay of 48\rm Ca yields a null result and a corresponding lower limit on the half-life is found to be T0ν1/2 > 2.0 × 1022 \rm yr at 90% confidence level, translating into an upper limit on the effective Majorana neutrino mass of < mββ > < 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.