The odd-odd Cs isotopes ${}^{128-134}\mathrm{Cs}$ have been investigated in search of chiral doublet bands. Two nearly degenerate bands built on the $\pi h_{11/2}\otimes \nu h_{11/2}$ configuration have been identified in ${}^{128-132}\mathrm{Cs}.$ Systematics of various experimental observables associated with the partner bands are presented. The ${B\left(M1\mathrm{}\right)\mathrm{}}_{\mathrm{In}}{/B\left(M1\mathrm{}\right)\mathrm{}}_{\mathrm{Out}}$ staggering with spin was discovered to be in phase with the $B\left(M1\mathrm{}\right)/B\left(E2\mathrm{}\right)\mathrm{}$ staggering for the yrast partner band. A core-quasiparticle coupling model employing the Kerman-Klein-Dönau-Frauendorf method was applied to study ${}^{128}\mathrm{Cs}.$ A triaxial core with an irrotational-flow moment of inertia was assumed. The chiral features, as well as previously known experimental characteristics of the $\pi h_{11/2}\otimes \nu h_{11/2}$ yrast partner band, are well reproduced demonstrating the important role played by triaxiality in the underlying physics in these nuclei.

• Received 22 October 2002

DOI:https://doi.org/10.1103/PhysRevC.67.044319