The high spin states of ${}^{143}\mathrm{Sm}$ have been studied by in-beam γ-spectroscopy following the reaction ${}^{130}\mathrm{Te}$(${}^{20}\mathrm{Ne}$,$7n$)${}^{143}\mathrm{Sm}$ at $E_{\mathrm{lab}}=137$ MeV, using a Clover detector array. More than 50 new gamma transitions have been placed above the previously known $J^{\pi }=23/2^{-}$, 30 ms isomer at 2795 keV. The level scheme of ${}^{143}\mathrm{Sm}$ has been extended up to 12 MeV and spin-parity assignments have been made to most of the newly proposed level. Theoretical calculation with the relativistic mean field approach using blocked BCS method, has been performed. A sequence of levels connected by $M1$ transitions have been observed at an excitation energy ∼8.6 MeV. The sequence appears to be a magnetic rotational band from systematics.

• Received 6 October 2005

DOI:https://doi.org/10.1103/PhysRevC.73.044305