SELECTIVE NUCLEAR TRANSPARENCY INDUCED BY CHAOTIC SCATTERING

We investigate the effects of nuclear absorption on the population of intrinsic vibrational states in scattering processes involving heavy i ons. It is found that at the classical level the removal of flux assum es a qualitatively different form in the regular or chaotic regimes. S pecifically, it is shown how certain reaction channels turn out to be- in the latter case-relatively insensitive to the strength of the absor ptive potential, This realization has a counterpart at the quantum lev el where, at the chaotic layer, conditions of selective transparency i n the nuclear system are enforced.