Measurement of Charge Exchange Losses in the VICKSI Cyclotron

High-energy (E=5 to 20 MeV/amu) ion-atom collisions have been studied using the internal ion beam of the VICKSI separated-sector heavy-ion cyclotron. Various combinations of accelerated ions and target gases have been investigated using the beam attenuation method to infer charge-exchange cross sections as a function of ion energy and atomic target. The analysis indicates ??q??q s-1 (where s=v/c) for Zion=6, 20 and 40 and Eion=0.5 to 20 MeV/amu in N2, Ar and Kr gas.