Directional Correlation Measurements inHf178

Measurements of the directional correlations of the 1335-93 kev, 1345-93 kev, and 1390-93 kev $\gamma -\gamma$ cascades in ${\mathrm{Hf}}^{178}$ have been made, using a liquid source of 21-day ${\mathrm{W}}^{178}$ in equilibrium with 9.3-min ${\mathrm{Ta}}^{178}$. It is shown that the data support the tentative spin assignments of Gallagher et al. The 1390-kev $\gamma$ ray is found to be almost pure quadrupole radiation. If the spin and parity of the 1430-kev level is 1+, as suggested by Gallagher et al., the multipolarity of the 1335-kev $\gamma$ ray is determined by our measurements to be mainly $M1\mathrm{}$. Using these results, the amount of $E0\mathrm{}$ radiation in the 1309-kev transition has been estimated. It is found that approximately 70% of the 1390-kev $K$-conversion electrons are due to monopole transitions.