Abstract
Experimental decay rates for the spin-forbidden ns2npk−1-nsnpk transitions in highly ionized Be-like, B-like, Mg-like and Al-like ions have been obtained by the beam-foil technique. Results are reported for Be-like and B-like Fe22+, Al-like Kr23+, Y26+ and Rh32+ and Mg-like Ni16+, Kr24+, Y27+ Zr28+, Nb29+ and Rh33+. For all ions in the Mg- and Al-like sequences the experimental oscillator strengths are larger than the theoretical predictions and, furthermore, the discrepancy tends to increase with increasing charge state. For both the Be- and B-like ions good agreement is found between theory and experiment. The experimental data presented here was obtained using the RILAC accelerator at RIKEN.
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