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The nature of $J^{\pi}=1^-$ levels of $^{96}$Zr below the $\beta$-decay$Q_{\beta}$ value of $^{96}$Y has been investigated in high-resolution$\gamma$-ray spectroscopy following the $\beta$ decay as well as in a campaignof inelastic photon scattering experiments. Branching ratios extracted from$\beta$ decay allow the absolute $E1$ excitation strength to be determined forlevels populated in both reactions. The combined data represents acomprehensive approach to the wavefunction of $1^-$ levels below the$Q_{\beta}$ value, which are investigated in the theoretical approach of theQuasiparticle Phonon Model. This study clarifies the nuclear structureproperties associated with the enhanced population of high-lying levels in the$^{96}$Y$_{gs}$ $\beta$ decay, one of the three most important contributors tothe high-energy reactor antineutrino spectrum.

Structure of high-lying levels populated in the $^{96}$Y $\rightarrow ^{96}$Zr $\beta$ decay