Equilibrium charge states ofHe3ions emerging from solid targets at high incident energies

The yield of ${}_{}{}^3{}_{}{}^{}\mathrm{He}_{}^{1+}{}_{}{}^{}$ ions produced by a ${}_{}{}^3{}_{}{}^{}\mathrm{He}_{}^{2+}{}_{}{}^{}$ beam in C, Al, Ni, Ag, and Au foils was measured at 68, 99, and 130 MeV in order to determine the electron-capture cross sections ${\sigma }_c$. Measurements were performed using targets thicker than 60 μg/${\mathrm{cm}}^2$, where charge equilibrium was found. The results are compared with electron-stripping and -capture theories, which are found to explain fairly well the yield of ${}_{}{}^3{}_{}{}^{}\mathrm{He}_{}^{1+}{}_{}{}^{}$.