Nuclear astrophysics experiments with intermediate-energy radioactive ion beams

Experimental studies of nuclear astrophysics using intermediate-energy radi oactive ion beams at RIKEN are presented. To overcome the low intensity and low emittance of the beams, we employed Coulomb dissociation and Coulomb e xcitation with reversed kinematics where the excitation energy is determine d by measuring invariant masses or de-excitation gamma -ray energies. Vario us (p,gamma) reactions in the pp chain, the hot- and regular-CNO cycles and the hot pp mode were investigated indirectly.