The Dynamical Dipole Mode in Fusion Reactions with Exotic Nuclear Beams
  We report the properties of the prompt dipole radiation, produced via a collective bremsstrahlung mechanism, in fusion reactions with exotic beams. We show that the gamma yield is sensitive to the density dependence of the symmetry energy below/around saturation. Moreover we find that the angular distribution of the emitted photons from such fast collective mode can represent a sensitive probe of its excitation mechanism and of fusion dynamics in the entrance channel. 
V.Baran, C.Rizzo, M.Colonna, M.Di Toro, D.Pierroutsakou