Abstract
The collinear fast-beam-laser and rf-laser double-resonance technique has been used to make precise measurements of the magnetic dipole and electric quandrupole hyperfine constants of several states belonging to the 4f126s and 4f125d manifolds in 167Er II. The experimental data are analyzed within the Sandars-Beck effective-operator formalism by means of the parametric fitting approach, and a discussion of the results based on state-dependent ab initio multiconfiguration Dirac-Fock (MCDF) calculations of the magnetic dipole and electric quadrupole hyperfine constants is given. A 25% deviation between the experimental and ab initio MCDF values for the contact parameter ⟨r-3⟩6s10 is found, and possible causes of this discrepancy are discussed. In particular, the influence of the magnetic part of the Breit Hamiltonian on the reduced radial parameters of the Sandars-Beck theory has been investigated.
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