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In a previous work, the measurement of radiative vacancy transfer probabilities from the K shell to the L sub‐shells were measured, when rare earth elements were irradiated with 3 MeV–4 MeV protons. It was found that those probabilities did not depend on the ion energy and there was a close agreement with theoretical predictions. Therefore, in this work the K‐shell X‐ray intensity ratios for rare‐earth elements have been measured following irradiation with 12C4+ and 16O5+ ion beams, with incident energies between 12 MeV and 15 MeV. From the X‐ray intensity ratios, the radiative vacancy transfer probabilities from the shell K to the L sub‐shells were determined. The experimental data were compared to theoretical predictions, such as the Scofield theoretical predictions for these probabilities. The results showed a good agreement between theory and experiment, and did not show dependence with the ion incident energy.