Directional Correlation of the Gamma Rays of ${\mathrm{La}}^{140}$, ${\mathrm{Ce}}^{140}$, ${\mathrm{Pt}}^{192}$, and ${\mathrm{As}}^{75}$

The decay scheme of ${\mathrm{La}}^{140}$ was investigated by using summing techniques. This scheme was found to be compatible with a modification of the schemes proposed earlier by other investigators. The 537-kev gamma ray was found to parallel the other transitions. Directional correlation measurements made in the 162-kev to 304-kev cascade do not allow definite spin and multipole order assignment. The following spin sequence (in the order of decreasing energy) appears to be the most probable $1\left(Q\right)3(D, Q)4\mathrm{}$.