The structure of ${}_{}{}^{147}{}_{}{}^{}\mathrm{Pr}$ has been investigated by performing measurements of γ-ray and conversion-electron singles and γγ coincidence spectra of mass separated sources of 56-s ${}_{}{}^{147}{}_{}{}^{}\mathrm{Ce}$. The proposed level scheme extends the known structure of ${}_{}{}^{147}{}_{}{}^{}\mathrm{Pr}$ to an energy of 2.2 MeV and includes several levels below 1.2 MeV that have not been identified in previous decay studies of ${}_{}{}^{147}{}_{}{}^{}\mathrm{Ce}$. Measurement of the conversion coefficients for several transitions has led to the assignment of negative parity to the levels at 362, 452, 467, and 608 keV in ${}_{}{}^{147}{}_{}{}^{}\mathrm{Pr}$, which show properties similar to low-energy negative-parity states identified in ${}_{}{}^{145}{}_{}{}^{}\mathrm{Pr}_{86}^{}{}_{}{}^{}$, ${}_{}{}^{145}{}_{}{}^{}\mathrm{La}_{88}^{}{}_{}{}^{}$, and ${}_{}{}^{149}{}_{}{}^{}\mathrm{Pm}_{88}^{}{}_{}{}^{}$. The presence of low-energy negative-parity states suggests that configurations having significantly different deformation, related to the highly deformed region above N=90 and/or to the reflection asymmetric region identified around ${}_{}{}^{145}{}_{}{}^{}\mathrm{Ba}$, may manifest themselves at low energy in these nuclides.

• Received 28 January 1993

DOI:https://doi.org/10.1103/PhysRevC.48.1579