Photoproduction of two pions on nucleon and deuteron is studied for photon energies from threshold up to Eγ = 1.5 GeV. For the elementary operator an effective Lagrangean approach is used with resonance and Born contributions. The model parameters are fixed by resonance decay widths and multipole analyses of single pion photoproduction. A satisfactory description of total cross sections of two-pion production on the proton for various charge channels is achieved, except for π 0 π 0 production for which a significant underestimation is found near threshold. The operator then serves for the evaluation of this reaction on the deuteron in the impulse approximation. In addition, N N rescattering in the final state is taken into account, but πN and ππ rescatterings are neglected. Results are presented for total cross sections and target asymmetries.PACS numbers: 13.60.-r, 13.60. Le, 21.45.+v,

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The influence of final state N N -and πN -rescattering in incoherent pion photoproduction on the deuteron has been investigated. For the elementary photoproduction operator an effective Lagrangian model is used which describes well the elementary reaction. The interactions in the final two-body subsystems are taken in separable form. While N N -rescattering shows quite a significant effect, particularly strong for neutral pion production, πN -rescattering is almost negligible. Inclusion of such effects leads to an improved and quite satisfactory agreement with experiment.PACS numbers: 13.60. Le, 21.45.+v, 25.20.Lj

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