Algebraic description of the triaxially to axially rotational shape phase transition

Abstract

Within the framework of the interacting boson model, we propose a novel algebraic scheme to describe spin-dependent structural evolutions in triaxial nuclei. Our analysis demonstrates that a triaxially to axially rotational shape phase transition can be induced by the high-order correction which is microscopically motivated by the pairing interaction on the $\gamma$-unstable rotation. This prescription is further applied to describe the structural evolutions along the yrast sequences of ${}^{132}$Ba and ${}^{130}$Xe, providing an exemplary case for demonstrating a unified explanation of both low-energy collective structures and high-spin phenomena in O(6)-like nuclei.

11 pages, 8 figures

References in corpus (7)

• Excited state quantum phase transitions in many-body systems
• Quantum phase transitions in the interacting boson model
• Excited-state quantum phase transitions
• Triaxiality in the interacting boson model
• Anomalous low-energy $E2$-related behavior in triaxial nuclei
• Triaxial rotor modes in finite-N boson systems
• B(E2) anomaly and triaxial deformation in the interacting boson model