In the present work, we have done a systematic study of β-decay properties such as electron spectral shapes, shape factors, and $\text{log}ft$ values for the higher forbidden nonunique ${\beta }^{-}$ transitions in the mass region $A=85–123$. We have performed the nuclear shell model calculations to explore the sensitivity of the electron spectral shapes for different axial-vector-coupling constants $g_A=0.8–1.27$. The effective interactions GWBXG, G-matrix, SNET, and SN100PN are used for different model spaces. In the present work, we have computed the electron spectral shapes of ${}^{85}\mathrm{Br}, {}^{87}\mathrm{Rb}, {}^{93}\mathrm{Zr}, {}^{97}\mathrm{Zr}, {}^{101}\mathrm{Mo}, {}^{115}\mathrm{Cd}, {}^{117}\mathrm{Cd}, {}^{119}\mathrm{In}, {}^{123}\mathrm{Sn}$, and ${}^{135}\mathrm{Cs}$ by constraining the small relativistic nuclear matrix element from conserved-vector-current hypothesis. We have found that the electron spectral shapes are strongly dependent on $g_A$ except the second forbidden nonunique ${\beta }^{-}$ transition ${}^{93}\mathrm{Zr}$.

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• Beta decay
• Nuclear forces
• Nuclear structure & decays
• 90 ≤ A ≤ 149
• Shell model