Zeeman Investigations of Curium-242

The atomic-beam magnetic-resonance method has been used to investigate 163-day ${\mathrm{Cm}}^{242}$. The spin of this even-even nuclide is found to be zero. Four low-lying electronic energy levels are found and the Lande $g$-factors are measured to be $g_{J2\mathrm{}}=2.561\mathrm{}\pm 0.003$, $g_{J3\mathrm{}}=2.000\mathrm{}\pm 0.003$, $g_{J4\mathrm{}}=1.776\mathrm{}\pm 0.002$ and $g_{J5\mathrm{}}=1.671\mathrm{}\pm 0.003$. No direct measurement can be made of the angular momenta of these levels, but other considerations contained in the text make highly probable the $J$ values indicated in subscripts and arising from the electronic configuration ${\mathrm{}\left(5f\right)\mathrm{}}^7{\mathrm{}\left(6d\right)\mathrm{}}^1{\mathrm{}\left(7s\right)\mathrm{}}^2$.