Enhanced excitation of giant pairing vibrations in heavy-ion reactions induced by weakly bound projectiles

Abstract:

The use of radioactive ion beams is shown to offer the possibility to study collective pairing states at high excitation energy, which are not usually accessible with stable projectiles because of large energy mismatch. In the case of two-neutron stripping reactions induced by ⁶He, we predict a population of the giant pairing vibration in ²⁰⁸Pb or ¹¹⁶Sn with cross-sections of the order of a millibarn, dominating over the mismatched transition to the ground state.