Multiphonon and "hot"-phonon isovector electric-dipole excitations

We argue that a substantial increase in the cross section for Coulomb excit ation in the region of the Double Giant Dipole Resonance should be expected from Coulomb excitation of excited states involved in the spreading of the one-phonon resonance, in a manifestation of the Brink-Axel phenomenon. Thi s generates an additional fluctuating amplitude and a corresponding new ter m to be added incoherently to the usual cross section. The appropriate exte nsion of an applicable reaction calculation is considered in order to estim ate this effect. (C) 1999 Academic Press.