Experimental results in Lu isotopes in the A approximate to 160 mass, region have been interpreted as indicating the existence of the wobbling mode proposed by Bohr and Mottelson. Despite the success analysing the obtained data by use of the phenomenological particle-plus-rotor model (PRM) by Hamamoto, questions still remain. These questions relate to the lack of evidence of even-even wobbling systems, the anharmonicity of the wobbling spectrum and the nonlinear spin dependence of the excitation energy. An extension of the original Bohr-Mottelson. model is suggested that incorporates spin dependence into the moment of inertia which provides a possible mechanism for explaining the latter two questions, whilst Phenomenological arguments are adopted for the first.
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