On the collisional damping of giant dipole resonance

Collisional damping widths of giant dipole excitations are calculated in Thomas–Fermi approximation by employing the microscopic in-medium cross-sections of Li and Machleidt and the phenomenological Gogny force. The results obtained in both calculations compare well, but account for about 25–35% of the observed widths in 120Sn and 208Pb at finite temperatures.