TABLE II: Two neutrino half-life values for different nuclei obtained in the NEMO 3 experiment (for $^{116}$Cd, $^{48}$Ca and $^{130}$Te the results are preliminary). The first error is statistical and the second is systematic while S / B is the signal-to-background ratio. Isotope Measurement Number of S / B T$_{1}$$_{/}$$_{2}$ (2 ν ), y time, days 2 ν events $^{100}$Mo 389 219000 40 (7 . 11 ± 0 . 02 ± 0 . 54) × 10 18 [8] $^{100}$Mo-$^{100}$Ru(0 + 1 ) 334.3 37.5 4 (5 . 7 +1 . 3 $_{−}$0 9 ± 0 . 8) × 10 20 [10] $^{82}$Se 389 2750 4 (9 . 6 ± 0 . 3 ± 1 . 0) × 10 19 [8] $^{116}$Cd 168.4 1371 7.5 (2 . 8 ± 0 . 1 ± 0 . 3) × 10 19 $^{96}$Zr 1221 428 1 (2 . 35 ± 0 . 14 ± 0 . 19) × 10 19 [12] $^{150}$Nd 939 2018 2.8 (9 . 11 +0 . 25 $_{−}$0 22 ± 0 . 63) × 10 18 [11] $^{48}$Ca 943.16 116 6.8 (4 . 4 +0 . 5 $_{−}$0 4 ± 0 . 4) × 10 19 $^{130}$Te 1152 236 0.35 (6 . 9 ± 0 . 9 ± 1 . 0) × 10 20 surements performed with HPGe detectors and with radon detectors are used to verify the results. Different level of radon activity in the tracking volume were detected in the data taken before October 2004 (Phase 1), and after the installation of the antiradon facility (Phase 2). Measurements of the 2 νββ decay half-lives have been performed for seven isotopes avail- able in NEMO 3 (see Table 1). The NEMO 3 results of 2 νββ half-life measurements are given in Table 2. For all the isotopes the energy sum spectrum, single-electron energy spectrum and angular distribution were measured. The $^{100}$Mo double beta decay to the 0 + 1 excited state of $^{100}$Ru T 2 ν 1 / 2 = [5 . 7 +1 . 3 $_{−}$0 $_{9}$( stat ) ± 0 . 8( syst )] · 10 $^{20}$y has also been measured by NEMO 3 [10]. For $^{100}$Mo, $^{82}$Se, $^{96}$Zr and $^{150}$Nd these results are published. For the other isotopes their status is preliminary. A. Measurement of 2 νββ half-lives 6