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It is tempting to try to explain the reported time-modulated decay rate inthe GSI experiment by arguing that the matrix element for decay at any timeresults in an interference between two slightly different momentum values inthe parent ion beam. I show here that a unitarity theorem of quantum mechanicsrules out a wide class of such explanations.

Unitarity Constraint upon Kinematical Analyses of the GSI Time-Modulated Radioactive Decay Experiment