Abstract
The excited states in the odd-$A$ ${}^{197}$Tl nucleus have been studied by populating them using the ${}^{197}$Au($\ensuremath{\alpha}$, 4$n$)${}^{197}$Tl reaction at a beam energy of 48 MeV. The $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coincidence data were taken using a combination of clover, low-energy photon spectrometer (LEPS), and single-crystal high-purity germanium (HPGe) detectors. Precise spin and parity assignments of the excited states have been done through polarization and directional correlation from oriented states (DCO) measurements. A new band structure has been identified and evidence for a possible intruder $\ensuremath{\pi}{i}_{13/2}$ state has been found for the first time. Possible configurations of the observed bands have been discussed. The total Routhian surface calculations have been performed to study the shape of ${}^{197}$Tl for different configurations.
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