Signature inversion in band of Eu-152 and Tb-154,Tb-156

摘要

The phenomenon of signature inversion observed in the band of Eu-152 and Tb-156 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 Eu-152 and Tb-156 , are fixed and also the ambiguity regarding spin assignment to this band observed in Tb-156 is resolved. These calculations are further extended to the same band () observed in Tb-154 nuclide and signature inversion observed in this band is successfully reproduced.