Measurement of the double-β decay half-life of 150Nd and search for neutrinoless decay modes with the NEMO-3 detector

Abstract : The half-life for double-β decay of 150Nd has been measured by the NEMO-3 experiment at the Modane Underground Laboratory. Using 924.7 days of data recorded with 36.55 g of 150Nd, we measured the half-life for 2νββ decay to be T 2ν 1/2 = (9.11+0.25 −0.22(stat.) ± 0.63(syst.)) × 1018 yr. The observed limit on the half-life for neutrinoless double-β decay is found to be T 0ν 1/2 > 1.8 × 1022 yr at 90% confidence level. This translates into a limit on the effective Majorana neutrino mass of (mν ) < 4.0-6.3 eV if the nuclear deformation is taken into account. We also set limits on models involving Majoron emission, right-handed currents, and transitions to excited states.
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Submitted on : Monday, August 30, 2010 - 1:47:53 PM
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J. Argyriades, R. Arnold, C. Augier, J. Baker, A.S. Barabash, et al.. Measurement of the double-β decay half-life of 150Nd and search for neutrinoless decay modes with the NEMO-3 detector. Physical Review C, American Physical Society, 2009, 80, pp.032501. ⟨10.1103/PhysRevC.80.032501⟩. ⟨in2p3-00427207⟩

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