Low-energy Radioactive Beam Experiments Using the Um-und Solenoid Rnb Apparatus at the Und Tandem: Past, Present and Future

Approximately ten years ago (1987) one of the first operational low-energy radioactive nuclear beam (RNB) facilities was put into place at the University of Notre Dame (UND) as a joint project between the University of Michigan (UM) and UND. The key elements to the success of the project were the installation of a largebore 3.5 Tesla superconducting solenoid (supplied by UM) to collect and focus secondary radioactive beams, combined with an upgrade of the UND FN Tandem, the latter including the addition of a high-intensity sputter ion source. The resulting secondary beams (Li, He, Be, B, F, ...) are generally produced by selective, high-cross-section direct reactions. These beams are sufficiently intense (viz. 10/s to 10/s) to permit measurement of many low-energy reaction cross sectons of interest to nuclear astrophysics, nuclear reaction theory, and high-isospin nuclear physics. A review of past and recent RNB data obtained with this apparatus will be presented together with plans for a major upgrade using a pair of 6T solenoids ( M.Y. Lee et al. this conference).