A doublet-band structure consisting of two $\mathrm{\Delta }I=1$ bands connected by multiple interband transitions was identified in ${}^{112}\mathrm{Sb}$, with an average energy difference of only 36 keV between the two bands. It represents the most degenerate doublet-band structure observed so far in nuclear systems. The experimental fingerprints and theoretical calculations indicate that the doublet-band structure arises from chiral symmetry breaking. This result provides the first example in which a pure high-$j$ particle-hole configuration and triaxial rotational behavior emerge simultaneously, giving rise to exceptionally strong chiral degeneracy.

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• High spin states
• Nuclear structure & decays
• 90 ≤ A ≤ 149