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

Abstract

Based on the reported positive-parity doublet bands in 120 I, the corresponding experimental characteristics including rotational alignment have been discussed and corresponding configuration assignment is reexamined. The self-consistent tilted axis cranking relativistic mean-field calculations indicates that this doublet bands is built on configuration πh 11/2 ⊗ νh −1 11/2 . In addition, adopting the two quasiparticles coupled with a triaxial rotor model, the excitation energies, energy staggering parameter S(I), B(M 1)/B(E2), effective angles, and K plots have been discussed and also compared with the available data. All of these results support the interpretation of chiral doublet bands for the positive-parity doublet bands in 120 I, and hence identify this nucleus as the border of the A ≈ 130 island of chiral candidates.