Production fission fragment secondary beams in reverse kinematics using a large-solid angle 7T superconducting solenoid in a TOF mode as a mass separator: 197AU + C at 20 MeV/u

Relatively neutron-rich fission-fragment secondary beams have been produced using a 20 MeV/u beam of 197Au29+ incident on a natural carbon target of areal density 47 mg/cm2 at the National Superconducting Cyclotron Laboratory at Michigan State University (PAC17-NSCL Expt. No. 94027). The reaction products are kinematically focused, resulting in good collection efficiency as a large superconducting solenoid at θ = 0 degrees is used to collect and separate the fragments. The latter is configured for a 7 meter flight path with its focus on a stack of silicon detectors. ΔE, ETotal, TOF, and Bρ allow for the identification of the fragments. Analysis shows predominantly symmetric fission of Au nuclei with fragments concentrated about Z = 34 to 40 and A = 80 to 96. Well focused secondary, neutron-rich fission fragment beams of 102/s to 103/s appear feasible