Abstract
The structure of $^{145}\mathrm{Pr}$ has been investigated by measuring the gamma-ray singles, gamma-ray coincidence, and gamma-ray angular correlation spectra, along with conversion-electron singles spectra for the decay of 3.0-min $^{145}\mathrm{Ce}$ to levels of $^{145}\mathrm{Pr}$. A level scheme is proposed that includes a number of new levels as well as new spin and parity assignments for several levels. The conversion-coefficient measurements establish the presence of a low-energy ${(3/2}^{\mathrm{\ensuremath{-}}}$ level at 787 keV whose strong population in beta decay confirms negative parity for the ground state of $^{145}\mathrm{Ce}$. Interacting boson-fermion model calculations for $^{143}\mathrm{Pr}$ and $^{145}\mathrm{Pr}$ are found to be in reasonable agreement with the observed low-energy positive-parity levels, while the presence of the low-energy ${(3/2}^{\mathrm{\ensuremath{-}}}$ level suggests the coexistence of more deformed configurations.
Published Version
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