Abstract
The stopping powers for 0.5--5.2 MeV ${}^{11}\mathrm{B}$ ions in the C, Al, Ti, Cu, Nb, and Ag targets have been measured using a transmission technique. The experimental error is about 3%. The results are compared to the TRIM-91 calculation and fitted to an empirical formula. Our measurements for ${}^{11}\mathrm{B}$ in the Al target are reasonably consistent with Ziegler's compilation. However, for the other five stoppers, significant deviation is found. The effective charge deduced from our experimental measurements appears to have a clear dependence on the stopping medium. The electronic stopping power at low energies exhibits a strong ${Z}_{2}$ oscillation, which becomes weaker with increasing energy of boron ions.
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