Low-spin excitations of ${}^{91}\mathrm{Zr}$ and ${}^{93}\mathrm{Zr}$ nuclei, populated in the ($n,\gamma$) cold-neutron-capture reactions, have been studied using the highly efficient array EXILL, at the Institute-Laue-Langevin (ILL), Grenoble. 14 new excited levels and 36 new $\gamma$ transitions, including 16 primary decays, have been found in the two nuclei. High accuracy of transition energies obtained in the present work allowed to improve neutron binding energies of both nuclei determined in this work at 7194.06(8) keV in ${}^{91}\mathrm{Zr}$ and 6734.92(5) keV in ${}^{93}\mathrm{Zr}$. The accurate $S_n$ values helped to improve masses of ${}^{91,93,95,97}\mathrm{Zr}$ isotopes. Significant lowering of the $3/2_1^{+}$ excitation in ${}^{93}\mathrm{Zr}$ is interpreted as due to anomalous coupling of the odd neutron in the $\nu d_{5/2}$ shell to the $2_1^{+}$ vibrations of adjacent Zr cores.

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• Electromagnetic transitions
• Nuclear structure & decays
• Nucleon induced nuclear reactions
• Radiative capture
• 90 ≤ A ≤ 149