Reliable measurement of the Li-like 2248Ti 1s2s2p 4P5/2o level lifetime by beam-foil and beam-two-foil experiments

We have determined the lifetime of the Li-like Ti-48(22) 1s2s2p P-4(5/2)o level (210.5 +/- 13.5 ps) using data from its x-ray decay channel through beam single- and two-foil experiments, coupled to a multicomponent iterative growth and decay analysis. Theoretical lifetime estimates for this zero-nuclear-spin ion lies within the uncertainty range of our experimental results, indicating that blending contributions to this level from the He-like 1s2p P-3(2)o and 1s2s S-3(1) levels are eliminated within the current approach. A previously reported discrepancy between experimental and theoretical 1s2s2p P-4(5/2)o level lifetimes in V-51(23) may, as a result, be attributed to hyperfine quenching.