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The seniority scheme has been shown to be extremely useful for theclassification of nuclear states in semi-magic nuclei. The neutron-proton($np$) correlation breaks the seniority symmetry in a major way. As a result,the corresponding wave function is a mixture of many components with differentseniority quantum numbers. In this contribution we show that the $np$interaction may favor a new kind of coupling in $N=Z$ nuclei, i.e., theso-called isoscalar spin-aligned $np$ pair mode. Shell model calculationsreveal that the ground and low-lying yrast states of the $N = Z$ nuclei$^{92}$Pd and $^{96}$Cd may mainly be built upon such spin-aligned $np$ pairseach carrying the maximum angular momentum $J = 9$ allowed by the shell$0g_{9/2}$ which is dominant in this nuclear region.

Coherence features of the spin-aligned neutron-proton pair coupling scheme