Double-β decays with the NEMO experiment: final results of NEMO-2 with various nuclei and status of NEMO-3

The NEMO-2 prototype, built for background measurements and located in the Fréjus Underground Laboratory (4800 m w.e.) has provided results with three ββ decay sources, ¹⁰⁰Mo, ¹¹⁶Cd and ⁸²Se with data accumulated over a total of 23000 h. Final results of ββ2ν half-lives measurements and limits on 0ν modes are given here. The NEMO-3 detector which will be able to accomodate sources of 10 kg is now under construction. The aim of the experiment is to reach a half-life measurement of 10²⁵y for ββ0ν decay, which corresponds to a Majorana neutrino mass of 0.1 eV for ¹⁰⁰Mo.