Hyperfine Structure of the Spectra of Dysprosium, Cobalt, Vanadium, Manganese, and Lanthanum

Study of the hyperfine structure of the spectra of Dy i and D ii yielded the result that the nuclear spins of ${\mathrm{Dy}}^{161}$ and ${\mathrm{Dy}}^{163}$ are very probably $\frac{7}{2}$ and their nuclear magnetic moments are approximately equal. The quadrupole moments of Co, V, Mn, and La were deduced by hyperfine structure investigation to be $Q\left({\mathrm{Co}}^{59}\right)=(0.5\mathrm{}\pm 0.2)\times {10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$, $Q\left({\mathrm{V}}^{51}\right)=(0.3\mathrm{}\pm 0.2)\times {10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$, $Q\left({\mathrm{Mn}}^{55}\right)=(0.4\mathrm{}\pm 0.2)\times {10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$, $Q\left({\mathrm{La}}^{139}\right)=(0.9\mathrm{}\pm 0.1)\times {10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$. The eccentricities of odd-proton nuclei were calculated from the existing data, and they were plotted versus the proton number. It was found that they attain large maxima in light and heavy elements.