Hyperfine Structure ofCu63andCu65

Abstract

The hyperfine splittings of the electronic ground states of the stable copper isotopes ${\mathrm{Cu}}^{63}$ and ${\mathrm{Cu}}^{65}$ have been measured by the atomic beam magnetic resonance method. The magnitudes of these splittings are $\Delta \nu \left({\mathrm{Cu}}^{63}\right)=11\mathrm{}733.83\pm 0.01$ Mc/sec, $\Delta \nu \left({\mathrm{Cu}}^{65}\right)=12\mathrm{}568.81\pm 0.01$ Mc/sec, and their ratio is $\frac{\Delta {\nu }_{63}}{\Delta {\nu }_{65}}=0.933567\mathrm{}\pm 0.000002$. If this ratio is compared with the ratio of the magnetic moments as measured by nuclear magnetic resonance, viz. $\frac{{\mu }_{63}}{{\mu }_{65}}=0.933424\mathrm{}\pm 0.000019$, one finds a "hyperfine structure anomaly" of $\Delta =\left[\frac{\Delta {\nu }_{63}·{\mu }_{65}}{\Delta {\nu }_{65}·{\mu }_{63}}\right]-1=(0.015\mathrm{}\pm 0.002)\%.$