A recoil mass separator for nuclear astrophysics experiments

Abstract A recoil mass separator was constructed for experiments of nuclear astrophysics using radioactive nuclear beams, and its performance was tested. The observed beam suppression factor around M ∼20 was 10 −4 when the system was tuned for ΔM =1 heavier ions than beam ions. With a charge state breeding technique, it became 10 −8 when the system was tuned for Δq =+1 larger ions than beam ions.