Abstract
Gamma decay of the low-energy octupole resonance in $^{90}\mathrm{Zr}$ was studied by inelastic $\ensuremath{\alpha}$ scattering at 99.3 MeV. Correlation functions measured for the ground-state transition support a spin-3 assignment for the low-energy octupole resonance. Observed branching ratios to the ground and the low-lying states around ${E}_{x}\ensuremath{\sim}2.2$ MeV are respectively (7.9\ifmmode\pm\else\textpm\fi{}1.0)% and (32\ifmmode\pm\else\textpm\fi{}10)%, which are significantly larger than those predicted by the statistical-decay model.
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