Band structures and intruder $\ddot{I}€$$i_{13/2}$ state in ${}^{197}$Tl

Abstract

The excited states in the odd-$A$ ${}^{197}$Tl nucleus have been studied by populating them using the ${}^{197}$Au($\hat{I}\pm$, 4$n$)${}^{197}$Tl reaction at the beam energy of 48 MeV. The ${\hat{I}}^3-{\hat{I}}^3$ coincidence data were taken using a combination of clover, LEPS and single crystal HPGe detectors. Precise spin and parity assignments of the excited states have been done through the polarization and the DCO measurements. A new band structure has been identified and the evidence for a possible intruder $\ddot{I}€i_{13/2}$ 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.

Accepted for publication in PRC