Yrast isomers in tin nuclei from heavy ion collisions and the nu h11/2 subshell filling.

Long-lived 10{sup +} isomers in {sup 122}Sn and {sup 124}Sn have been identified among the products of {sup 124}Sn+325 MeV {sup 76}Ge collisions. The measurements virtually complete a series of {ital B}({ital E}2) determinations for ({nu}{ital h}{sub 11/2}){sup {ital n}} states in {sup 116{minus}130}Sn, which pinpoint half filling of the {nu}{ital h}{sub 11/2} subshell very close to {ital N}=73. Results for these {ital Z}=50 isotopes and for the {ital N}=82 isotones are contrasted, and an enlightening comparison between the effective {ital E}2 charges observec in tin and lead isotopes is developed.