Hfs of the5P322State ofIn115andIn113: Octupole Interactions in the Stable Isotopes of Indium

The zero-field hfs intervals in the $5{}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}$ state of ${\mathrm{In}}^{115}$ and ${\mathrm{In}}^{113}$ have been measured by the use of conventional atomic-beam techniques. The magnetic octupole interaction constants for these atomic systems are determined from the measured intervals and corrected for perturbations of the electronic states. They are $c^{\prime }\left({\mathrm{In}}^{115}\right)=[0.001702\mathrm{}\pm \mathrm{}(35\left)\right]\times {10}^6 invsec,$ $c^{\prime }\left({\mathrm{In}}^{113}\right)=[0.001728\mathrm{}\pm \mathrm{}(45\left)\right]\times {10}^6 invsec.$ The estimated values of the nuclear magnetic octupole moments of ${\mathrm{In}}^{115}$ and ${\mathrm{In}}^{113}$ are compared to the predictions of the single-particle and collective models of the nucleus.