Journal
PHYSICAL REVIEW D
Volume 93, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.93.112008
Keywords
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Funding
- CNRS/IN2P3 in France
- RFBR in Russia
- STFC in the U.K.
- NSF in U.S.
- STFC [ST/N000455/1, ST/K002856/1, ST/K00140X/1, ST/K002864/1, ST/K002848/1, ST/H000577/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K002813/1 SuperNEMO, ST/K002864/1 SuperNEMO, 1497580, ST/K001426/1, ST/K002848/1 SuperNEMO, ST/K00140X/1, ST/H000577/1, ST/N000455/1, ST/K002848/1, ST/H000607/1 SuperNEMO, ST/H000577/1 SuperNEMO, ST/K002864/1, ST/K002856/1, PP/E000452/1, ST/K002856/1 SuperNEMO, ST/H000615/1 SuperNEMO, SuperNEMO] Funding Source: researchfish
- Division Of Physics
- Direct For Mathematical & Physical Scien [1505149] Funding Source: National Science Foundation
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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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