Angular Correlation of Gamma Rays inPb204m

The anisotropies of the three pairs of gamma rays in the triple cascade of 1.1-hour ${\mathrm{Pb}}^{204m}$ have been measured. The results were 0.163±0.010 for the 374-899 kev (prompt) pair; 0.414±0.015 for the 913-899 kev pair; and 0.398±0.011 for the 913-374 kev pair. These results are consistent with the scheme, $9\left(E5\mathrm{}\right)4\left(E2\mathrm{}\right)2\left(E2\mathrm{}\right)0$.