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Guo, S.; Zhou, X.H.; Petrache, C.M.; Lawrie, E.A.; Mthembu, S.H.; Fang, Y.D.; Wu, H.Y.; Wang, H.L.; Meng, H.Y.; Li, G.S.; Qiang, Y.H.; Wang, J.G.; Liu, M.L.; Zheng, Y.; Ding, B.; Zhang, W.Q.; Rohilla, A.; Muhki, K.R.; Yang, Y.Y.; Ong, H.J.; Ma, J.B.; Xu, S.W.; Bai, Z.; Fan, H.L.; Huang, J.F.; Li, J.H.; Xu, J.H.; Lv, B.F.; Hua, W.; Gan, Z.G.; Zhang, Y.H.
Physics letters. B, 05/2022, Volume: 828Journal Article
The precession of an atomic nucleus can be approximately described as wobbling motion, arising from the coupling of a rotation and a harmonic vibration. Recently, a number of wobbling bands were reported at low spin, which violate the wobbling approximation that can be valid only at high spin. In the present work, we explore the nature of the reported low-spin wobbling bands. Via a new experiment including both angular correlation and linear polarization measurements, we demonstrate that one such band in 187Au is generated by dominant single-particle excitation rather than by the excitation of a wobbling phonon. Assessing the experimental proofs and discussions to assign the reported low-spin wobbling bands, we further point out that the imperfect research paradigm used previously would lead to unreliable identification of low-spin wobbling bands.
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