Energy Loss ofNe20Ions in Aluminum

The energy losses of 19.8- and 18.5-MeV ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ ions in aluminum have been measured by a new technique. The Doppler-shifted energies of $\gamma$ rays from the first excited state of ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$, produced in the ${}_{}{}^{12}{}_{}{}^{}C{({}_{}{}^{12}{}_{}{}^{}C,\alpha )}^{20}$ Ne reaction, were used to determine the Ne-ion velocities before and after passing through an aluminum foil. The results are in good agreement with expected energy losses, thus removing a discrepancy in earlier work.