Track experiment for the double beta decay investigation of the different isotopes

TPC in magnetic field had been proposed to search for the neutrinoless double beta decay of the different isotopes. First stage of this program was the prototype TPC with volume 0.3m 3 . 150 Nd 2β2v decay with half-life time T 1/2 (2β2v) = (1.88 ± 0.39 0.69 ± 0.19) · 10 19 years was observed. There was shown the powerful ability of the track experiment to suppress the background. The rejection factor k > 10 7 was obtained at the laboratory on the sea level. The large setup (TPC with volume 13m 3 in the magnet with diameter d=5.5m) is under construction