Nuclear Orientation ofTb160

Abstract

Nuclear orientation of ${\mathrm{Tb}}^{160}$ in a single crystal of neodymium ethylsulphate has been observed by the anisotropic intensity distribution of the $\gamma$ rays. The alignment arises from the coupling of the nuclear-magnetic and quadrupole moments with the crystal field. The spin of ${\mathrm{Tb}}^{160}$ is shown to be 3, and the spin of the 1360-kev level in ${\mathrm{Dy}}^{160}$ is 2. The nuclear moments of ${\mathrm{Tb}}^{160}$ are $\left|\mu \right|=1.60\mathrm{}\pm 0.25$ nm and $Q=+1.9\mathrm{}\pm 0.5$ barns.