Nuclear Spin, Hyperfine Structure, and Nuclear Moments of 64-Hour Yttrium-90

Abstract

The atomic-beam magnetic-resonance method has been used to measure the nuclear spin and hyperfine-structure separations of 64-hour ${\mathrm{Y}}^{90}$. The results are $I=2\mathrm{}$, $a\left({}_{}{}^2{}_{}{}^{}D_{\frac{3}{2}}^{}{}_{}{}^{}\right)=-169.749\mathrm{}\left(7\right)\mathrm{}$ Mc/sec, $b\left({}_{}{}^2{}_{}{}^{}D_{\frac{3}{2}}^{}{}_{}{}^{}\right)=-21.602\mathrm{}\left(27\right)\mathrm{}$ Mc/sec, $a\left({}_{}{}^2{}_{}{}^{}D_{\frac{5}{2}}^{}{}_{}{}^{}\right)=-85.258\mathrm{}\left(6\right)\mathrm{}$ Mc/sec, $b\left({}_{}{}^2{}_{}{}^{}D_{\frac{5}{2}}^{}{}_{}{}^{}\right)=-29.716\mathrm{}\left(38\right)\mathrm{}$ Mc/sec. The uncorrected nuclear moments calculated from these measurements are ${\mu }_I=-1.623\mathrm{}\left(8\right)\mathrm{}$ nm, $Q=-0.155\mathrm{}\left(3\right)\mathrm{}$ b.