Study of nuclear reactions with intense, high-purity, low-energy radioactive ion beams using a versatile multi-configuration dual superconducting-solenoid system
Abstract A new device (TwinSol) installed at the Nuclear Structure Laboratory at the University of Notre Dame implements a pair of large-bore 6 T superconducting solenoids for producing relatively pure, high-intensity beams of exotic light nuclei at low-energies (10–80 MeV). Typical beams include 8 Li and 6 He (T 1/2
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 large-bore 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 (8Li, 6He, 7Be, 8B, 18Fm, …) are generally produced by selective, high-cross-section direct reactions. These beams are sufficiently intense (viz. 104/s to 108/s) to permit measurement of many low-energy reaction cross sections 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 u...
Applications of kinematics to nuclear reactions using radioactive ion beams
Abstract The observation of nuclear reactions by use of radioactive ion beams, as noon-accelerated secondary beams, has been limited by relatively poor energy resolution due to the large energy spread in the secondary beam, its large angular spread and the large beam spot size. In addition there is often an uncertain beam composition. This work shows that under certain conditions all of these problems can be minimized by employing kinematic coincidence for complte determination of the secondary reaction final state, from which secondary beam particle, energy, and angle, can be determined. A partial cancellation can lead to even better energy resolution in the Q -spectrum than in the beam energy spectrum.