DAMPING OF SINGLE-PARTICLE STATES AND GIANT RESONANCES IN PB-208

The damping width of single-particle states and of giant resonances is estimated in 208Pb, based on the excitation of surface modes and T = 1 pairs. The damping is dominated by the collectivity of the surface modes, with the pairing modes playing a weaker role. For both the single-particle states and giant resonances, the predicted damping is somewhat small. This could be due to the neglect of T = 0 particle-particle correlations or to the neglect of the volume modes. The damping for the giant resonances is reduced by the coherence between particle and hole. © 1979.