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The inversion of 3/2$^{-}$ and 5/2$^{-}$ levels in heavier Cu isotopes is oneof the most visible example of shell-evolution, caused by the strong monopoleattraction between the nucleons occupying the orbitals $\pi 0f_{5/2}$ and $\nu0g_{9/2}$. The tensor part of the nucleon-nucleon interaction is expected to bethe driving force behind this monopole migration. In shell model framework,usually spin-tensor decomposition is used to get the information of individualforce components to the shell evolution, however, in the present scenario, thismethod can not apply on \textit{pfg} model space due to the missing spin-orbitpartners $ 0f_{7/2}$ and $ 0g_{7/2}$. Therefore, we have analytically obtainedthe tensor force two-body matrix elements (TBMEs) for this model space usingYukawa potential, and subtract it from effective interaction jj44b \cite{}. Theinteraction without tensor part, named as jj44a, have been used for calculationof Ni, Zn, Ge and Cu isotopes with various physics viewpoints. In most of thecases, the theoretical results are in good agreement with the experiment onlywhen tensor force is included to the interaction jj44a.

Effect of tensor force on lowering of 5/2$^{-}$ level in heavier Cu isotopes