The ${\beta }^{-}$ decay of ${}^{135}\mathrm{Sn}$ was studied for the first time yielding a half-life of 0.6(1) s and a partial level scheme for the ${\beta }^{-}$ decay to ${}^{135}\mathrm{Sb}.$ The ${}^{135}\mathrm{Sn}$ activity was produced at the mass separator OSIRIS via the fast neutron-induced fission of a ${}^{238}\mathrm{U}$ target inside a specially constructed ion source. ${}^{135}\mathrm{Sn}$ is the heaviest Sn isotope, for which spectroscopic results are presently determined. The new results are in disagreement with some of the theoretical predictions, which are used for modeling of the astrophysical r process.

• Received 23 August 2000

DOI:https://doi.org/10.1103/PhysRevC.64.021302