Abstract
The NEMO-3 experiment is located in the Modane Underground Laboratory (LSM) and has been taking data since 2003 with seven isotopes. It is searching for the double beta decay process with two (2νββ) or zero (0νββ) neutrinos emitted in the final state. Precision measurements of the half-life of the isotopes due to 2νββ decay have been performed and new results for T2ν1/2(96Zr) = [2.3 ± 0.2(stat) ± 0.3(syst)] ∣ 1019y, T2ν1/2(48Ca) = [4.4+0.5-0.4(stat) ± 0.4(syst)|·1019y and T2ν1/2(150Nd) = [0.920+0.025-0.022(stat)± 0.072 (syst)]· 1019y are presented here. Measurements of this process are important for reducing the uncertainties on the nuclear matrix elements. No evidence for 0νββ decay has been found and a 90% Confidence Level lower limit on the half-life of this process is derived. From this an upper limit can be set on the effective Majorana neutrino mass using the most recent nuclear matrix elements (NME) calculations.
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