Enhanced 0+g.s. $\rightarrow$ 2+1 E2 Transition Strength in $^{112,114}$Sn
Résumé
The poorly known B(E2; 0+s\rightarrows 2+) values of 112Sn and 114Sn have been measured to high precision. Two Coulomb excitation experiments were performed to determine the reduced transition probabilities relative to 116Sn in order to minimize the systematic errors. The obtained B(E2 $\uparrow$) values of 0.242(8) e2b2 for 112Sn and 0.232(8) e2b2 for 114Sn confirm the tendency of large B(E2 $\uparrows) values for the lighter tin isotopes below the midshell 116Sn that has been observed recently in various radioactive ion beam experiments.