Measurement of the g-factor of the negative muon in the 1s-state of Zn and Cd atoms

Precise measurement of the anomalous g-value, aμ=(g-2)/2, of the negative muon bound in an atom provides a sensitive test on the validity of: (1) the relativistic correction to g; (2) the quantum electrodynamics correction in a strong Coulomb field of the nucleus. In this work the magnetic moment of the negative muon in the 1s-state of Zn and Cd atoms was measured. A substantial deviation of the experimental data from the results of theoretical calculations is found. Possible reasons of this disagreement are discussed