Nuclear recoil effect on the magnetic-dipole decay rates of atomic levels

The effect of finite nuclear mass on the magnetic-dipole transition probabilities between fine-structure levels of the same term is investigated. Based on a rigorous quantum-electrodynamic approach a nonrelativistic formula for the recoil correction to first order in me/M is derived. Explicit results for the B-like and Al-like highly charged ions have been obtained within the one-electron approximation. The values for the recoil correction together with the total values of the transition probabilities have been obtained for the case of B-like Ar13+ and Al-like Fe13+ ions. Comparison of our total results with the most accurate experimental data reveals remaining discrepancies, which can not be explained by the recoil correction