The locations of 13 energy levels have been deduced from $\gamma$-ray single and $\gamma -\gamma$ coincidence measurements on the $\mathrm{EC}-{\beta }^{+}$ decay of ${}_{}{}^{177}{}_{}{}^{}\mathrm{Ta}$ to ${}_{}{}^{177}{}_{}{}^{}\mathrm{Hf}$. Four energy levels and 14 $\gamma$ rays associated with ${}_{}{}^{177}{}_{}{}^{}\mathrm{Ta}$ decay were unknown from the previous NaI(Tl) work. The $log\mathrm{ft}$ values have been assigned to ${}_{}{}^{177}{}_{}{}^{}\mathrm{Ta}$ $\mathrm{EC}-{\beta }^{+}$ decay, and multipolarities of several transitions have been determined with use of earlier conversion electron data.

RADIOACTIVITY ${}_{}{}^{177}{}_{}{}^{}\mathrm{Ta}$; Measured $E_{\gamma }$, $I_{\gamma }$, $\gamma -\gamma$ coin; deduced $log\mathrm{ft}$ ${}_{}{}^{177}{}_{}{}^{}\mathrm{Hf}$; deduced levels, $I$, $\pi$. Ge(Li) detectors.

• Received 6 May 1974

DOI:https://doi.org/10.1103/PhysRevC.10.778