Evidence For Chiral Structures In Cs-130

Two low lying positive-parity bands in Cs-130 have been examined for chiral signatures. Small energy differences between the two bands, which have been previously observed, have been confirmed and the bands, as well as the number of transitions within and between the bands, extended. The intraband B(M1)/B(E2) ratios and B(MI)(intraband)/l3(M1)(interband) ratios and the energy staggering parameter, S(I), have been deduced for these partner bands. The results are found to be consistent with a chiral interpretation for the two structures. Core-quasiparticle coupling model calculations have been performed to study Cs-130 assuming a triaxial core. The experimental level energies and electromagnetic properties of the bands, resulting from the pi h(11/20) circle times vh(11/2)(-1) configuration, are reasonably well reproduced by the model, providing further evidence in support of the chiral interpretation of the two structures.