Storage-Ring Measurements of Hyperfine Induced Transition Rates in   Berylliumlike Ions
  The status of experimental measurements and theoretical calculations of the hyperfine induced 2s2p 3P0 -> 2s2 1S0 transition rate in Be-like ions is reviewed. Possible reasons, such as external electromagnetic fields and competing E1M1 two-photon transitions, for presently existing significant discrepancies between experiment and theory are discussed. Finally, directions for future research are outlined. 
Stefan Schippers
physics.atom-ph