Structure of Sn isotopes beyond N=82

We have performed shell-model calculations for ${}^{134,135}\mathrm{Sn}$ using a realistic effective interaction derived from the CD-Bonn nucleon-nucleon potential. Comparison shows that the calculated results for ${}^{134}\mathrm{Sn}$ are in very good agreement with recent experimental data. This supports confidence in our predictions of the hitherto unknown spectrum of ${}^{135}\mathrm{Sn}.$