Recoil separator ERNA: charge state distribution, target density, beam heating, and longitudinal acceptance

摘要

For improved cross section measurements of the reaction ~(12)C(α, γ)~(16)O in inverted kinematics, a recoil separator ERNA is developed at the 4MV Dynamitron tandem accelerator in Bochum to detect directly the ~(16)O recoils with high efficiency. The ~(16)O recoils are produced by the ~(12)C projectiles in a windowless ~4He gas target. We report on the charge state distribution of the ~(16)O recoils, the gas target density, the beam heating of the gas target, and the acceptance of the separator along the extended gas target.