Studies of Quadrupole Interactions by means of Angular Correlations

Measurements of the nuclear quadrupole interaction have been made for the first ${\frac{5}{2}}^{+}$ excited state of ${\mathrm{Ta}}^{181}$ in several compounds of Hf, and for the first ${\frac{5}{2}}^{+}$ excited state of ${\mathrm{Cd}}^{111}$ in In metal by time-differential and by integral-combined-field angular-correlation studies. Interaction frequencies derived from the two measurements are in reasonable agreement and demonstrate the static nature of the interactions involved. Quadrupole-interaction frequencies in ${10}^6$ rad/sec were determined as ${{\omega }_E}^0=6\mathrm{} {\omega }_E=(324\mathrm{}\pm 20)$, ($\ge 600$), ($\ge 600$) for ${\mathrm{Ta}}^{181}$ in metallic Hf, HfO${\mathrm{Cl}}_2$·8${\mathrm{H}}_2$O, and Hf${\mathrm{O}}_2$, respectively, and (39±10) for ${\mathrm{Cd}}^{111}$ in In metal by combined interaction measurements. A fundamental frequency of ${{\omega }_E}^0=(680\mathrm{}\pm 80)$ for ${\mathrm{Ta}}^{181}$ in HfO${\mathrm{Cl}}_2$·8${\mathrm{H}}_2$O was determined by a differential measurement. Limitations and possibilities of the two techniques are discussed.