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First measurement of the g factor in the chiral band: The case of the Cs-128 Isomeric state
(American Physical Society, 2018) Grodner, E.; Srebrny, J.; Droste, Ch.; Prochniak, L.; Rohozinski, S. G.; Kowalczyk, M.; Ionescu-Bujor, M.; Ur, C. A.; Starosta, K.; Ahn, T.; Kisielinski, M.; Marchlewski, T.; Aydın, S.; Recchia, F.; Georgiev, G.; Lozeva, R.; Fiori, E.; Zielinska, M.; Chen, Q. B.; Zhang, S. Q.; Yu, L. F.; Zhao, P. W.; Meng, J.
The g factor of the 56 ns half-life isomeric state in Cs-128 has been measured using the time-differential perturbed angular distribution method. This state is the bandhead of the positive-parity chiral rotational band, which emerges when an unpaired proton, an unpaired neutron hole, and an even-even core are coupled such that their angular momentum vectors are aplanar (chiral configuration). g-factor measurements can give important information on the relative orientation of the three angular momentum vectors. The measured g factor g = +0.59(1) shows that there is an important contribution of the core rotation in the total angular momentum of the isomeric state. Moreover, a quantitative theoretical analysis supports the conclusion that the three angular momentum vectors lie almost in one plane, which suggests that the chiral configuration in Cs-128 demonstrated in previous works by characteristic patterns of electromagnetic transitions appears only above some value of the total nuclear spin.