Abstract
Excited states in $^{159}\mathrm{Sm}$, populated following the spontaneous fission of $^{252}\mathrm{Cf}$ have been studied by means of $\ensuremath{\gamma}$ spectroscopy, using the Gammasphere array. In $^{159}\mathrm{Sm}$ we have identified an isomeric level with a half-life of ${T}_{1/2}=116(8)$ ns at an excitation energy of 1276.8 keV and observed a rotational band on top of this isomer. On the basis of the observed properties of the isomer and the band on top of it we propose that the 1276.8-keV level in $^{159}\mathrm{Sm}$ corresponds to the $11/{2}^{\ensuremath{-}}[505]$ neutron extruder configuration. The new excitation scheme of $^{159}\mathrm{Sm}$ is compared to quasiparticle rotor model calculations.
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