The extension of the HHIRF accelerators to produce radioactive ion beams

The production of medium-intensity, proton-rich, radioactive ion beams for nuclear physics, astrophysics, and applied research with the HHIRF accelerators is discussed. Radioactive atoms will be produced with fusion reactions by light-ion beams from the K = 105 Oak Ridge Isochronous Cyclotron stopping in an ISOLDE-type thick target mounted on a 300-kV high-voltage platform. These radioactive atoms will be ionized, mass separated, and charge exchanged to negative ions on the high-voltage platform prior to injection into the HHIRF 25-MV tandem accelerator. Beams of up to mass 80 will be accelerated to energies greater than 5 MeV/nucleon. For some radioactive beams, intensities greater than 1 pnA can be expected. 7 refs., 1 fig., 1 tab