Low-spin states built on the $\pi h_{11/2}\nu h_{11/2}$ configuration in ${}^{134}\mathrm{Pr}$ have been studied using a ${}^{119}\mathrm{Sn}{(}^{19}\mathrm{F},4n)$ fusion-evaporation reaction. A planar low-energy photon spectrometer along with a low-$Z$ target chamber was utilized in an array of five high-purity Ge detectors for the purpose of measuring low-energy $\gamma$ rays. A 39.3-keV $\gamma$ ray was discovered as a new transition at the bottom of the band. The transition was found to have an $M1\mathrm{}$ multipolarity, determined from the internal conversion coefficients evaluated from the missing transition intensity. The new bandhead was assigned and was identified as an isomeric state with a mean lifetime of $\tau =4.6\mathrm{}\left(1\right)\mathrm{}\mathrm{ns}.$ This bandhead decays by a 306-keV $\gamma$-ray transition that was found to have an $E1\mathrm{}$ multipolarity through the analysis of the angular distribution asymmetry.

• Received 12 July 2002

DOI:https://doi.org/10.1103/PhysRevC.67.057301