We study the effect of a direct Giant Dipole Resonance (GDR) excitation in
intermediate dinuclear systems with exotic shape and charge distributions
formed in charge asymmetric fusion entrance channels. A related enhancement of
the GDR gamma yield in the evaporation cascade of the fused nucleus is
expected. The dynamical origin of such GDR extra strength will show up in a
characteristic anisotropy of the dipole gamma-emission. A fully microscopic
analysis of the fusion dynamics is performed with quantitative predictions of
the GDR photon yield based on a dynamics- statistics coupling model. In
particular we focus our attention on the energy and mass dependence of the
effect.
We suggest a series of new experiments, in particular some optimal entrance
channel conditions. We stress the importance of using the new available
radioactive beams.Comment: 20 pages (Latex), 14 Postscript figure
