Study of 2$\beta$-decay of $^{100}$Mo and $^{82}$Se using the NEMO3 detector

After analysis of 5797 h of data from the detector NEMO3, new limits on neutrinoless double beta decay of $^{100}$Mo ($T_{1/2} > 3.1\cdot 10^{23}$y, 90% CL) and $^{82}$Se ($T_{1/2} > 1.4\cdot 10^{23}$y, 90% CL) have been obtained. The corresponding limits on the effective majorana neutrino mass are: $\langle m_{\nu}\rangle< (0.8-1.2)$ eV and $\langle m_{\nu}\rangle< (1.5-3.1)$ eV, respectively. Also the limits on double-beta decay with Majoron emission are: $T_{1/2} > 1.4\cdot 10^{22}$y (90%CL) for $^{100}$Mo and $T_{1/2}> 1.2\cdot 10^{22}$y (90% CL) for $^{82}$Se. Corresponding bounds on the Majoron-neutrino coupling constant are $\langle g_{ee}\rangle < (0.5-0.9) \cdot 10^{-4}$ and $< (0.7-1.6) \cdot 10^{-4} $. Two-neutrino $2\beta$-decay half-lives have been measured with a high accuracy, $T_{1/2}^{^{100}{\rm Mo}} = [7.68 \pm 0.02({\rm stat}) \pm 0.54({\rm syst}) ] \cdot 10^{18}$y and $T_{1/2}^{^{82}{\rm Se}} = [10.3 \pm 0.3({\rm stat}) \pm 0.7({\rm syst}) ]\cdot 10^{19}$y.