\begin{document}$ ^{70-76} $\end{document}Ni are considered. Accordingly, pairing forces in the form of surface delta interaction are employed to account for the formation of the ground state multiplet with seniority \begin{document}$ \nu = 2 $\end{document} states. The multiplet splitting is described with mass relationships of masses of neighboring nuclei. Subsequently, the seniority model is adopted to reproduce or predict the states \begin{document}$ \nu = 3 $\end{document} in odd-even isotopes and \begin{document}$ \nu = 4 $\end{document} in even-even isotopes. The correct account of the \begin{document}$ 2_1^+ $\end{document} state should allow for the description of the reversed order of \begin{document}$ J = 4 $\end{document} states with \begin{document}$ \nu = 2 $\end{document} and \begin{document}$ \nu = 4 $\end{document} observed in experiments. The results obtained are compared with the structure of similar multiplets in \begin{document}$ N=50 $\end{document} isotones."> Seniority and <inline-formula><tex-math id="M1">\begin{document}${ \left(\frac{\bf 9}{{\bf 2}}\right)^{\boldsymbol n} }$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/f77f5f53-39dc-46c8-8b71-eb6409e09e13/CPC-2022-0025_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/f77f5f53-39dc-46c8-8b71-eb6409e09e13/CPC-2022-0025_M1.png"/></alternatives></inline-formula> configurations in neutron-rich Nickel isotopes -
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