Evidence of Partial Seniority Conservation in the pi9/2 Shell for the N=50 Isotones

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The reduced transition probabilities for the ${4}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+}$ and ${2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+}$ transitions in $^{92}\mathrm{Mo}$ and $^{94}\mathrm{Ru}$ and for the ${4}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+}$ and ${6}_{1}^{+}\ensuremath{\rightarrow}{4}_{1}^{+}$ transitions in $^{90}\mathrm{Zr}$ have been determined in this experiment making use of a multinucleon transfer reaction. These results have been interpreted on the basis of realistic shell-model calculations in the ${f}_{5/2}$, ${p}_{3/2}$, ${p}_{1/2}$, and ${g}_{9/2}$ proton valence space. Only the combination of extensive lifetime information and large scale shell-model calculations allowed the extent of the seniority conservation in the $N=50$ ${g}_{9/2}$ orbital to be understood. The conclusion is that seniority is largely conserved in the first $\ensuremath{\pi}{g}_{9/2}$ orbital.