Nuclear Resonance Fluorescence inNi60

The gamma radiation emitted by a gaseous source of ${\mathrm{Co}}^{60}$ ${\mathrm{Cl}}_2$ has been used to excite the 1.33-Mev level in ${\mathrm{Ni}}^{60}$. The angular distribution of the resonance radiation characterizes the spin of the 1.33-Mev excited state as 2 and the spin of the ${\mathrm{Ni}}^{60}$ ground state as 0.