Study of Collective Levels in Tin-116, Tin-120, and Tin-124 by Inelastic Electron Scattering

We have observed the inelastic scattering of 150-MeV electrons from tin-116, tin-120, and tin-124. The main $2^{+}$ and $3^{-}$ states have been studied. By comparison of the reduced transition probabilities $B_{\exp }(L\to 0)$ with the corresponding single-particle estimates $B_I(L\to 0)$, we have measured the collective character of these levels which changes appreciably from one isotope to another.