Eur. Phys. J. A (2017) 53: 76
https://doi.org/10.1140/epja/i2017-12267-8

Regular Article - Theoretical Physics

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

¹ Department of Physics, Akal University, 151302, Talwandi Sabo, India
² Department of Physics, Maharishi Markandeshwar University, 133 207, Mullana, India

^* e-mail: sushil.rathi179@gmail.com

Received: 15 January 2017
Accepted: 30 March 2017
Published online: 26 April 2017

Abstract

The phenomenon of signature inversion observed in the 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 () observed in ¹⁵⁴Tb nuclide and signature inversion observed in this band is successfully reproduced.