Hyperfine-Structure Separations of ${Au}^{191}$ and ${Au}^{193}$

The hyperfine-structure separation in the

{}^{2}S_{\frac{1}{2}}

electronic ground state has been measured for two radioactive gold isotopes, 3-h

{Au}^{191}

and 17.5-h

{Au}^{193}

. Atomic-beam methods, after confirming that both nuclear spins are

I = \frac{3}{2}

, have provided hfs separations of

Δ ν ({Au}^{191}) = \pm 5770 (6)

Mc/sec and

Δ ν ({Au}^{193}) = \pm 5882 (10)

Mc/sec. Combined with recent work on

{Au}^{197}

, these values give uncorrected nuclear-magnetic dipole moments of

μ_{I} ({Au}^{191}) = \pm 0.136 (7)

nm, and

μ_{I} ({Au}^{193}) = \pm 0.138 (7)

nm. Both measurements are consistent with the assignment of the unpaired proton in gold to a

d_{\frac{3}{2}}

shell-model level.

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Hyperfine-Structure Separations ofAu191andAu193