Signature inversion in $\pi h_{11/2} \otimes \nu i_{13/2}$ π h 11 / 2 ⊗ ν i 13 / 2 band of 152 Eu and 154,156 Tb

The phenomenon of signature inversion observed in the $\pi h_{11/2} \otimes\nu i_{13/2}$ band of 152Eu and 156Tb nuclides is revisited through the axially symmetric two quasiparticle plus rotor model approach. The magnitude of experimentally observed signature splitting and point of signature inversion, which could not be explicitly reproduced in the earlier calculations, is successfully reproduced in the present study. Some of the critical issues, such as violation of the well-established Gallagher Moszkowski (GM) rule for eight GM doublets appearing in the basis space of earlier calculations of 152Eu and 156Tb , are fixed and also the ambiguity regarding spin assignment to this band observed in 156Tb is resolved. These calculations are further extended to the same band ( $\pi h_{11/2} \otimes\nu i_{13/2}$ ) observed in 154Tb nuclide and signature inversion observed in this band is successfully reproduced.