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Proton-scattering experiments followed by the coincident spectroscopy of$\gamma$ rays have been performed at the Institute for Nuclear Physics of theUniversity of Cologne to excite low-spin states in $^{112}$Sn and $^{114}$Sn,to determine their lifetimes and extract reduced transitions strengths $B(\PiL)$. The combined spectroscopy setup SONIC@HORUS has been used to detect thescattered protons and the emitted $\gamma$ rays of excited states incoincidence. The novel $(p,p'\gamma)$ DSA coincidence technique was employed tomeasure sub-ps nuclear level lifetimes.  74 level lifetimes $\tau$ of states with $J = 0 - 6$ were determined. Inaddition, branching ratios were deduced which allowed the investigation of theintruder configuration in both nuclei. Here, $sd$ IBM-2 mixing calculationswere added which support the coexistence of the two configurations.Furthermore, members of the expected QOC quintuplet are proposed in $^{114}$Snfor the first time. The $1^-$ candidate in $^{114}$Sn fits perfectly into thesystematics observed for the other stable Sn isotopes.  The $E2$ transition strengths observed for the low-spin members of theso-called intruder band support the existence of shape coexistence in$^{112,114}$Sn. The collectivity in this configuration is comparable to the oneobserved in the Pd nuclei, i.e. the 0p-4h nuclei. Strong mixing between the$0^+$ states of the normal and intruder configuration might be observed in$^{114}$Sn. The general existence of QOC states in $^{112,114}$Sn is supportedby the observation of QOC candidates with $J \neq 1$.

Shape coexisistence and collective low-spin states in $^{112,114}$Sn studied with the $(p,p'\gamma)$ DSA coincidence technique