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We report on the experimental study of quadrupole collectivity in theneutron-deficient nucleus \nuc{104}{Sn} using intermediate-energy Coulombexcitation. The $B(E2; 0^+_1 \rightarrow 2^+_1)$ value for the excitation ofthe first $2^+$ state in \nuc{104}{Sn} has been measured to be$0.180(37)~e^2$b$^2$ relative to the well-known $B(E2)$ value of \nuc{102}{Cd}.This result disagrees by more than one sigma with a recently publishedmeasurement \cite{Gua13}. Our result indicates that the most modern many-bodycalculations remain unable to describe the enhanced collectivity belowmid-shell in Sn approaching $N=Z=50$. We attribute the enhanced collectivity toproton particle-hole configurations beyond the necessarily limited shell-modelspaces and suggest the asymmetry of the $B(E2)$-value trend around mid-shell tooriginate from enhanced proton excitations across $Z=50$ as $N=Z$ isapproached.

Quadrupole collectivity in neutron-deficient Sn nuclei: \nuc{104}{Sn} and the role of proton excitations