Abstract

Isotope shift relative to $^{209}\mathrm{Bi}$ and hyperfine splitting for $^{211,213}\mathrm{Bi}$ have been measured by in-source laser spectroscopy at the 306.77-nm atomic transition. The pronounced shell effect both in radii and magnetic moments in Bi isotopes at $N=126$ has been observed. The isotopic trend of magnetic moment for $9/{2}^{\ensuremath{-}}$ ground states of even-$N$ Bi isotopes has been qualitatively explained by the change in the first-order core-polarization correction. The possible influence of the octupole degree of freedom on the magnetic moment behavior at $Ng126$ has been discussed.

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