Storage-ring measurement of the hyperfine-induced 2s 2p 3P0 -> 2s2 1S0   transition rate in beryllium-like sulfur
  The hyperfine induced 2s 2p 3P0 -> 2s2 1S0 transition rate in Be-like sulfur was measured by monitoring the decay of isotopically pure beams of 32-S12+ and 33-S12+ ions in a heavy-ion storage ring. Within the 4% experimental uncertainty the experimental value of 0.096(4)/s agrees with the most recent theoretical results of Cheng et al. [Phys. Rev. A 77, 052504 (2008)] and Andersson et al. [Phys. Rev. A 79, 032501 (2009)]. Repeated experiments with different magnetic fields in the storage-ring bending magnets demonstrate that artificial quenching of the 2s 2p 3P0 state by these magnetic fields is negligible. 
S. Schippers, D. Bernhardt, A. M\"uller, M. Lestinsky, M. Hahn, O.   Novotn\'y, D. W. Savin, M. Grieser, C. Krantz, R. Repno...
physics.atom-ph