Photoabsorption on a Nucleon in the D_{13} Resonance Energy Region
We present a simple model for the $\gamma N \to \pi \pi N$ reaction which reproduces the cross sections of the $\pi^+ \pi^- p, \pi^+ \pi^- n, \pi^+ \pi^0 n$ and $\pi^- \pi^0 p$ channels over the range of the energies 0.41-0.85 GeV. We use the dynamical model for the resonances, \Delta(1232), N^*(1520) and \rho-meson. The total photoabsorption off a nucleon is also discussed.