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

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.

arXiv comment6 pages, 5 figures, Accepted in Physical Review Letters

References in corpus (11)

• New parametrization for the nuclear covariant energy density functional with point-coupling interaction
• Multi chiral-doublets in one single nucleus
• Evidence for Multiple Chiral Doublet Bands in ${}^{133}$Ce
• Transverse wobbling-a collective mode in odd-A triaxial nuclei
• Transverse Wobbling in ${}^{135}$Pr
• Experimental Evidence for Transverse Wobbling in ${}^{105}$Pd
• Longitudinal Wobbling Motion in ${}^{187}$Au
• Behavior of the collective rotor in wobbling motion
• Transverse wobbling in an even-even nucleus
• QRPA treatment of the transverse wobbling mode reconsidered
• Wobbling geometry in simple triaxial rotor

Cited by in corpus (8)

• Evidence against the wobbling nature of low-spin bands in ${}^{135}$Pr
• Probing the nature of the conjectured low-spin wobbling bands in atomic nuclei
• $g$-factor and static quadrupole moment of ${}^{135}$Pr, ${}^{105}$Pd, and ${}^{187}$Au in wobbling motion
• Questioning the wobbling interpretation of low-spin bands in $\gamma$-soft nuclei within the interacting boson-fermion model
• Influence of moments of inertia on transverse wobbling mode in odd-mass nuclei
• Influence of triaxial deformation on wobbling motion in even-even nuclei
• Mapped interacting boson model for nuclear structure studies
• Parity Partner Bands in ${}^{163}$Lu: A novel approach for describing the negative parity states from a triaxial super-deformed band