Stopping energetic heavy ions in one-bar helium: narrow incident momentum distributions

Various tests for stopping energetic, 100–150 MeV/amu, heavy ions with narrow momentum distributions in a 50 cm gas cell filled with helium at 0.5–2 bar pressure were performed. The fraction of ions stopped in the gas was measured as a function of absorber thickness, gas pressure and length of ion path within the gas cell. Information on the range distribution was obtained and the residual energy distribution of ions was measured under different conditions. The experimental results for various beams are compared with stopping power calculations in the literature. The results are discussed in the context of the proposed RIA facility.