The development of the NEMO3 detector, which is now running in the Frejus Underground Laboratory (L.S.M. Laboratoire Souterrain de Modane), was begun more than ten years ago. The NEMO3 detector uses a tracking-calorimeter technique in order to investigate double beta decay processes for several isotopes. The technical description of the detector is followed by the presentation of its performance

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The NEMO-3 tracking detector is located in the Fréjus Underground Laboratory. It was designed to study double beta decay in a number of different isotopes. Presented here are the experimental half-life limits on the double beta decay process for the isotopes 100 Mo and 82 Se for different Majoron emission modes and limits on the effective neutrino-Majoron coupling constants. In particular, new limits on "ordinary" Majoron (spectral index 1) decay of 100 Mo (T 1/2 > 2.7 · 10 22 y) and 82 Se (T 1/2 > 1.5 · 10 22 y) have been obtained. Corresponding bounds on the Majoronneutrino coupling constant are g ee < (0.4 − 1.9) · 10 −4 and < (0.66 − 1.7) · 10 −4 .

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