Magnetic moments of (νi132)−n isomers in neutron-deficient lead isotopes

The magnetic moments of the 12⁺ isomers in ^{192, 196, 198, 200, 206}Pb and of the $\text{33}\text{2}{}^{\mathrm{+}}$ isomer in ²⁰⁵Pb have been measured using the PAD technique. The results for the g-factors are: g(192) = ?0.173(2), g(196) = ?0.1600(15), g(198) = ?0.1552(15), g(200) = ?0.1512(15), g(206) = ?0.1496(18), and g(205) = ?0.148(5). As all states have a rather pure $\text{(νi}{}_{\mathrm{<mtext>13</mtext><mtext>2</mtext>}}\text{)}{}^{\mathrm{?n}}$ configuration, the values reflect directly the $\text{νi}{}_{\mathrm{<mtext>13</mtext><mtext>2</mtext>}}$ orbital. They show a decrease towards the more neutron-deficient isotopes attributed to the reduced core polarisation as a result of decreasing occupation of the $\text{i}{}_{\mathrm{<mtext>13</mtext><mtext>2</mtext>}}$ neutron shell. The measured systematics are discussed regarding core polarisation, mesonic corrections, and small admixtures of core-excited states to the $\text{i}{}_{\mathrm{<mtext>13</mtext><mtext>2</mtext>}}$ wave function.