“…We are not aware of experimentally obtained scattering lengths of the D-D system. However, there are rather reliable calculations [24,25], see also [26], which give the following values of the scattering lengths in the singlet (S = 0) and quintet (S = 2) states a 0 = (10.2 + 0.2i) fm, a 2 = 7.5 fm. ( 25) Using the numbers ( 25) and the deuteron mass m D = 1876 MeV, we have calculated according to Eq.…”