Single-Neutron States inS133n

The location of several single-neutron states in ${}^{133}\mathrm{Sn}$ has been identified. The $p_{3/2}$, $h_{9/2}$, and $f_{5/2}$ states were found at 853.7, 1560.9, and 2004.6 keV, respectively, by measuring $\gamma$ rays in coincidence with delayed neutrons following the decay of ${}^{134}\mathrm{In}$. Crucial for obtaining the new data were the improved yields at the mass-separator facility ISOLDE-PSB at CERN. A semiempirically adjusted Woods-Saxon calculation, based on parameters from the Pb region and normalized on the mass data at ${}^{132}\mathrm{Sn}$, reproduces the new single particle energies with good precision.