First Measurement of the  <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>g</mml:mi></mml:math>  Factor in the Chiral Band: The Case of the  <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Cs</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>128</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>  Isomeric State

M. Zielinska, J. Srebrny, S. Aydin, Stanisław G. Rohoziński, Shudong Zhang, M. Ionescu-Bujor, K. Starosta, F. Recchia, Q. B. Chen, Jie Meng, E. Grodner, Georgi Georgiev, T. Marchlewski, E. Fiori, R. Lozeva, L. Próchniak, Ch. Droste, Tan Ahn, M. Kisieliński, M. Kowalczyk, Lu Yu, C. A. Ur, Pengwei Zhao

doi:10.1103/physrevlett.120.022502

The g factor of the 56 ns half-life isomeric state in ^{128}Cs 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 ^{128}Cs demonstrated in previous works by characteristic patterns of electromagnetic transitions appears only above some value of the total nuclear spin.

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