Considerations on rescattering effects for threshold photo- and electroproduction of pi(0) on the deuteron

We show that for the S-state pi(0) production in processes gamma+d-->d+pi(0) and e(-)+d-->e(-)+d+pi(0) the calculations of rescattering effects due to the transition gamma+d-->p+p+pi(-) (or n+n+pi(+))-->d+pi(0) have to take carefully into account the Pauli principle. The large values for these effects predicted in the past may result from the fact that the spin structure of the corresponding matrix element and the necessary antisymmetrization induced by the presence of identical protons (or neutrons) in the intermediate state was not taken into account accurately. One of the important consequences of these considerations is that pi(0) photo- and electroproduction on the deuteron near threshold can bring direct information about elementary neutron amplitudes