Spin and Nuclear Moments of theZn63Ground State

The hyperfine structure of the $\mathrm{}\left(4s4p\right)\mathrm{} {}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}$ state of 38-min ${\mathrm{Zn}}^{63}$ has been determined by the optical double-resonance technique. The measurements yield a nuclear spin $I=\frac{3}{2}$, a dipole interaction constant $A_{63}\left({}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}\right)=-326.57\mathrm{}\mathrm{}\left(4\right)\mathrm{}$ MHz, and a quadrupole interaction constant $B_{63}\left({}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}\right)=-34.46\mathrm{}\left(3\right)\mathrm{}$ MHz. If the hyperfine-structure anomaly and quadrupole shielding effects are neglected, the nuclear magnetic moment with diamagnetic correction is ${\mu }_{63}=-0.28156\mathrm{}\left(5\right)\mathrm{}{\mu }_N$, and the nuclear quadrupole moment $Q_{63}=+0.29\mathrm{}\left(3\right)\mathrm{}$ b. The ratio of the ${\mathrm{Zn}}^{63}$ and ${\mathrm{Zn}}^{67}$ quadrupole moments is $\frac{Q_{63}}{Q_{67}}=1.8347\mathrm{}\mathrm{}\left(13\right)\mathrm{}$, independent of the quadrupole shielding correction. This work represents the first successful application of the double-resonance method to nuclei with half-lives $\lesssim 1$ h.