Nuclear Moments ofSc43andSc47

Abstract

The magnetic and quadrupole moments of the radioactive isotopes ${\mathrm{Sc}}^{43}$ and ${\mathrm{Sc}}^{47}$ have been measured by atomic-beam magnetic resonance. Measurements were made of the hyperfine structure of these isotopes in the ${}_{}{}^2{}_{}{}^{}D_{\frac{5}{2}}^{}{}_{}{}^{}$ state of the scandium atom. The results (without diamagnetic or Sternheimer corrections) are ${\mathrm{Sc}}^{43}$: $A=+105.7\mathrm{}\pm 0.9$ Mc/sec, $B=-44\mathrm{}\pm 10$ Mc/sec, $\mu =+4.61\mathrm{}\pm 0.04$ nm, $Q=-0.26\mathrm{}\pm 0.06$ b. ${\mathrm{Sc}}^{47}$: $A=122.2\mathrm{}\pm 0.5$ Mc/sec, $B=-38\mathrm{}\pm 6$ Mc/sec, $\mu =+5.33\mathrm{}\pm 0.02$ nm, $Q=-0.22\mathrm{}\pm 0.03$ b. The electronic $g$ value in both cases was close to the LS-coupling value, and consistent with previous measurements on ${\mathrm{Sc}}^{44}$. The mean value of $g_J$ was determined from ${\mathrm{Sc}}^{43}$, ${\mathrm{Sc}}^{44}$, and ${\mathrm{Sc}}^{47}$ to be $g_J=-1.20061\mathrm{}\pm 0.00013$. Using this, the ${\mathrm{Sc}}^{44}$ moments were recalculated. A discussion of the interpretation of the moments of the scandium isotopes is included.