Systematic investigations of positive-parity doublet bands with three-quasiparticle configurations in Cs125,127,129,131

Abstract

The experimental features of positive-parity doublet bands in the odd-A cesium isotopes 125,127,129,131 Cs, including angular momentum alignment, energy staggering,are studied systematically and compared to those of the candidate chiral bands in the adjacent odd-odd Cs isotopes. The configuration assignments and the dynamics of these bands are discussed. The self-consistent tilted axis cranking relativistic mean-field calculations are performed with configuration reassigned to these bands. The experimental level schemes of four nuclei are well reproduced, and the calculations also show four nuclei have obvious triaxial deformations and thus support the candidate chiral doublet bands in 125,127,129,131 Cs.

Studying the doublet bands at the borders of the $A \approx 130$ island of chiral candidates: the $^{120}$I case

“…During the past few decades, the relativistic mean field (RMF) theory has been a great success in describing properties of nuclei and many nuclear phenomena [17,[68][69][70][71]. Based on the RMF theory, the tilted axis cranking relativistic mean-field (TAC-RMF) theory has been developed for describing many nuclear rotational phenomenon such as magnetic, antimagnetic and chiral rotation [17,57,62,72,73]. In the TAC-RMF theory, nuclei are characterized by the relativistic fields S(r) and V µ (r) in the Dirac equation in the rotating frame with a constant angular velocity vector Ω as…”