Exotic break-up modes in heavy ion reactions at low energies

New reaction mechanisms occurring in heavy ion collisions at low energy (10--30 MeV/nucleon) are investigated within the stochastic mean field model. We concentrate on the analysis of ternary breakup events, of dynamical origin, occurring in semicentral reactions, where the formation of excited systems in various conditions of shape and angular momentum is observed. We show how this fragmentation mode may emerge from the combined action of surface (neck) instabilities and angular momentum effects. Interesting perspectives on this mechanism in neutron-rich (or exotic) systems are developing, with the possibility of accessing information on the low-density behavior of the nuclear symmetry energy.

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