Thirty-six transitions from the excited levels of ${}_{}{}^{156}{}_{}{}^{}\mathrm{Gd}$ as fed by electron capture in ${}_{}{}^{156}{}_{}{}^{}\mathrm{Tb}$ have been studied. Level spins and parities, along with transition multipolarities, have been determined utilizing germanium solid-state detectors for the $\gamma$ rays and the Davis precision solenoidal $\beta$-ray spectrometer for the conversion electrons. The energies as measured by the spectrometer are determined to well within one part in 7000. A decay scheme is presented and the energy levels are discussed.

• Received 16 January 1970

DOI:https://doi.org/10.1103/PhysRevC.2.587