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The low-lying structure of semi-magic $^{118}$Sn has been investigatedthrough the $\beta$-decay of $^{118}$In ($T_{1/2}=4.45$ min) to study shapecoexistence via the reduced transition probabilities of states in the 2p-2hproton intruder band. This high-statistics study was carried out at TRIUMF-ISACwith the GRIFFIN spectrometer. In total, 99 transitions have been placed in thelevel scheme with 43 being newly observed. Three low-lying $\gamma$-raytransitions with energies near 285 keV have been resolved from which the2$^+_{\mathrm{intr.}} \rightarrow 0^+_{\mathrm{intr.}}$ 284.52-keV transitionwas determined to have half of the previous branching fraction leading to a$B(E2;2^+_2\rightarrow 0^+_2)$ of 21(4) W.u. compared to 39(7) W.u. from theprevious measurement. Calculations using $sd$ IBM-2 with mixing have also beenmade to compare the experimental $B(E2)$ values to the theoretical values andto make comparisons to the $^{114,116}$Sn isotopes previously studied using thesame theoretical model.

Collective 2p-2h intruder states in $^{118}$Sn studied via $\beta$-decay of $^{118}$In using GRIFFIN