Restriction on the neutron-antineutron oscillations from the SNO-data on the deuteron stability

Restriction on the neutron-antineutron oscillation time in vacuum is obtained from latest SNO-data on the deuteron stability, $\tau_D>3.01\cdot10^{31}$ years. Calculation performed within the quantum field theory based diagram technique reproduces satisfactorily results of the potential approach previously developed. The dependence of the obtained restriction on the total spin structure of the annihilating $N\bar N$-system and the deuteron wave function modifications is discussed.