Speaker
Description
The superconducting in-flight RI-beam separator BigRIPS produces RI beams by bombarding a beryllium target with heavy-ion beams such as uranium and lead at 345 MeV/nucleon. In recent years, the production of heavy RI beams in the Z>70 region by projectile fragmentation has been actively studied.
Heavy ions change their charge states when passing through materials in the separator and are distributed among multiple charge states. Ions of the same nuclide but with different charge states have different magnetic rigidities and follow different trajectories in the spectrometer. Therefore, understanding the charge-state distributions is essential for interpreting and predicting the yields of heavy RI beams.
In this study, uranium and lead beams were passed through several materials, including a beryllium target, and the charge-state distributions were measured with a downstream spectrometer. In this presentation, we report the measured charge-state distributions, compare the results with charge-state calculations, and discuss their impact on RI-beam production.