0 50 100 150 200 250 0 500 1000 1500 2000 2500 3000  Energy, KeV dN/dE FIG. 4: Energy spectra of different modes of 2 β 2 ν ( n = 5), 2 βχ 0 ( n = 1 , 2 and 3) and 2 βχ $^{0}$χ$^{0}$( n = 3 and 7) decays of $^{100}$Mo (see text). TABLE V: NEMO 3 limits on T$_{1}$$_{/}$$_{2}$ (y) for decay with one and two Majorons at 90% C.L. for modes with spectral index n = 1, n = 2, n = 3 and n = 7. Isotope n =1 n = 2 n = 3 n = 7 $^{100}$Mo [8] > 2.7 · 10 22 > 1.7 · 10 22 > 1 · 10 22 > 7 · 10 19 $^{82}$Se [8] > 1.5 · 10 22 > 6 · 10 21 > 3.1 · 10 21 > 5 · 10 20 $^{96}$Zr [12] > 1.9 · 10 21 > 9.9 · 10 20 > 5.8 · 10 20 > 1.1 · 10 20 $^{150}$Nd [11] > 1.5 · 10 21 > 5.4 · 10 20 > 2.2 · 10 20 > 4.7 · 10 19 The NEMO 3 detector has been operating within its target performance specifications since February 2003. The 2 νββ decay has been measured for seven isotopes with high statistics and greater precision than previously. The $^{100}$Mo 2 νββ decay to the 0 + 1 excited state of $^{100}$Ru has also been measured. No evidence for 0 νββ decay was found for all seven isotopes. The best 0 νββ limits have been obtained with $^{100}$Mo ( > 1 . 1 · 10 24 y at 90% C.L.) 10 IV. CONCLUSION