The high-spin structure above the previously known 10${}^{+}$ isomers of the ${}^{118,120,122,124}$Sn isotopes was studied via prompt $\gamma$-ray spectroscopy. All isotopes were populated as fragments following the fission of much heavier compound nuclei formed in three fusion-fission reactions. The ${}^{118,120,122}$Sn isotopes were also independently populated and studied as evaporation residues in the ${}^{124}$Sn$(n,xn\gamma )$ reactions, with $x=3,5,7$. Transitions above the previously known 10${}^{+}$ isomers were observed for the first time and the corresponding level schemes above these isomers were established up to 6646-, 5673-, 5386-, and 5952-keV excitation energy for ${}^{118,120,122,124}$Sn, respectively. The experimental results are compared with predictions from shell-model calculations.

• Received 6 October 2011

DOI:https://doi.org/10.1103/PhysRevC.84.054310