Collective dipole Bremsstrahlung in fusion reactions - art. no. 182501

We estimate the dipole radiation emitted in fusion processes. We show that a classical bremsstrahlung approach can account for both the preequilibrium and the thermal photon emission. We give an absolute evaluation of the pre equilibrium component due to the charge asymmetry in the entrance channel, and we study the energy and mass dependence in order to optimize the observ ation. This dynamical dipole radiation could be a relevant cooling mechanis m in the fusion path. We stress the interest in experiments with the new av ailable radioactive beams.