Nuclear Moments ofPm147

Abstract

The nuclear magnetic dipole and electric quadrupole moments of ${\mathrm{Pm}}^{147}$ have been derived from an analysis of the optical hyperfine structure of singly ionized ${\mathrm{Pm}}^{147}$. The hyperfine constants for the ${[4\mathrm{}{f}^5{}_{}{}^6{}_{}{}^{}H_{\frac{5}{2}}^{}{}_{}{}^{}, 6s]}_2$ ground state are $A=-10.24\mathrm{}\pm 0.20$ mK; $B=-10.6\mathrm{}\pm 2.6$ mK. By using the known atomic-beam data for the [$4f^{5}6s^2{}_{}{}^6{}_{}{}^{}H_{\frac{7}{2}}^{}{}_{}{}^{}$] state of neutral Pm to determine the contribution of the [$4f^5{}_{}{}^6{}_{}{}^{}H_{\frac{5}{2}}^{}{}_{}{}^{}$] core to the observed magnetic-splitting factor, the splitting factor of the $6s$ electron was found to be $a_{6s}=+214.2\mathrm{}\pm 4.9$ mK. The nuclear moments deduced from the hyperfine constants are ${\mu }_I\left({\mathrm{Pm}}^{147}\right)=+2.58\mathrm{}\pm 0.07$ nm and $Q\left({\mathrm{Pm}}^{147}\right)=+0.74\mathrm{}\pm 0.20$ b.