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arXiv · 2009.00493

First Observation of Multiple Transverse Wobbling Bands of Different Kinds in $^{183}$Au

S. Nandi·G. Mukherjee·Q. B. Chen·S. Frauendorf·R. Banik·Soumik Bhattacharya·Shabir Dar·S. Bhattacharyya·C. Bhattacharya·S. Chatterjee·S. Das·S. Samanta·R. Raut·S. S. Ghugre·S. Rajbanshi·Sajad Ali·H. Pai·Md. A. Asgar·S. Das Gupta·P. Chowdhury·A. Goswami
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Abstract

We report the first observation of two wobbling bands in $^{183}$Au, both of which were interpreted as the transverse wobbling (TW) band but with different behavior of their wobbling energies as a function of spin. It increases (decreases) with spin for the positive (negative) parity configuration. The crucial evidence for the wobbling nature of the bands, dominance of the $E2$ component in the $\Delta I = 1$ transitions between the partner bands, is provided by the simultaneous measurements of directional correlation from the oriented states (DCO) ratio and the linear polarization of the $\gamma$ rays. Particle rotor model calculations with triaxial deformation reproduce the experimental data well. A value of spin, $I_m$, has been determined for the observed TW bands below which the wobbling energy increases and above which it decreases with spin. The nucleus $^{183}$Au is, so far, the only nucleus in which both the increasing and the decreasing parts are observed and thus gives the experimental evidence of the complete transverse wobbling phenomenon.

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S. Nandi, G. Mukherjee, Q. B. Chen, S. Frauendorf, R. Banik, Soumik Bhattacharya, Shabir Dar, S. Bhattacharyya, C. Bhattacharya, S. Chatterjee, S. Das, S. Samanta, R. Raut, S. S. Ghugre, S. Rajbanshi, Sajad Ali, H. Pai, Md. A. Asgar, S. Das Gupta, P. Chowdhury, A. Goswami. 2020-09-01. First Observation of Multiple Transverse Wobbling Bands of Different Kinds in $^{183}$Au. https://doi.org/10.1103/physrevlett.125.132501

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