The high spin states of 143 Sm have been studied by in-beam γ -spectroscopy following the reaction 130 Te( 20 Ne,7n) 143 Sm at E lab = 137 MeV, using a Clover detector array. More than 50 new gamma transitions have been placed above the previously known J π = 23/2 − , 30 ms isomer at 2795 keV. The level scheme of 143 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.
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