Abstract
The pion photoproduction from three-body nuclei in the energy region of the first pion-nucleon resonance is calculated in the impulse approximation, including an estimation of the rescattering terms, and compared to recent experimental results. It is shown that the proper kinematics and the inclusion of theS′ andD states into the three-body nuclear wave function explains fairly well the position of the pion-nucleus resonance and the behaviour of the cross-section at fixed momentum transfer for the whole investigated region. The calculations are performed for several types of nuclear wave functions. The results are sensitive to the value of theD-state radius. The stability of the calculated curves with respect to the choice of the amplitude for the pion photo-production on nucleon is tested. At fixed angle, the measured cross-section disagrees with the bare impulse approximation calculations for higher values of the momentum transfer. In this case, the influence of the rescattering terms is discussed.
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