Possible candidates for multiple chiral doublet bands in cesium isotopes

Following the reports of candidate chiral doublet bands observed in odd-$A$ cesium isotopes, the triaxial deformations with corresponding configuration and the possible multiple chiral doublet ($\mathrm{M}\chi \mathrm{D}$) phenomenon in ${}^{125,127,129,131}\mathrm{Cs}$ are investigated within the adiabatic and configuration-fixed constrained triaxial relativistic mean-field (RMF) calculations. The existence of the $\mathrm{M}\chi \mathrm{D}$ phenomenon in ${}^{125,129,131}\mathrm{Cs}$ is demonstrated and expected based on different high-$j$ particle-hole configurations and triaxial deformations.

Figure 1

Contour plots of the potential energy surface in the $\beta \text{−}\gamma$ plane ($0\le \beta \le 0.4,0\le \gamma \le {60}^{\circ }$) for ${}^{125}\mathrm{Cs}$ (a), ${}^{127}\mathrm{Cs}$ (b), ${}^{129}\mathrm{Cs}$ (c), and ${}^{131}\mathrm{Cs}$ (d) in constrained triaxial RMF calculations with effective interaction PK1 [39]. All energies are normalized with respect to the binding energy of the absolute minimum (in MeV). The energy separation between contour lines is 0.6 MeV.

Figure 2

The energy surfaces in adiabatic (open circles) and configuration-fixed (solid lines) constrained triaxial RMF calculations using effective interaction PK1 for ${}^{125}\mathrm{Cs}$ (a), ${}^{127}\mathrm{Cs}$ (b), ${}^{129}\mathrm{Cs}$ (c), and ${}^{131}\mathrm{Cs}$ (d). The minima in the energy surfaces for fixed configuration are represented as stars and labeled respectively as A, B, C, D, E, and so on. Their corresponding triaxial deformation parameters $\beta$ and $\gamma$ are also given.