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A recently proposed solution of the `GSI anomaly' by spin precession of thedecaying heavy ions in the magnetic field that controls their circular motionat the GSI storage ring [G. Lambiase, G. Papini, G. Scarpetta, PLB 718 (2013)998, Ann. Phys. 332 (2013) 143] is dubious: the uncertainty in the computedelectron-capture decay-rate modulation frequency is at least of order 10E(7)Hz, by far exceeding the 1 Hz modulation frequency reported in the GSIexperiment.

Comment on a recent attempt to explain the `GSI anomaly' by initial-state e.m. spin-rotation coupling