Excited states of ¹⁵⁴Tm

A high-spin level structure of the nucleus Tm-154 has been established for the first time up to 6.14 MeV. The Sn-118 + Ca-40 reaction at 205 MeV associated with the recoil shadow method was used to identify the I-pi = (19)(+) isomeric state at 2.74 MeV. In-beam gamma-ray and conversion electron spectroscopy have been applied on the Sm-144(N-14, 4n) Tm-154 reaction at 95 MeV to build the level scheme. The level structure of Tm-154 is compared to other structures observed in N = 85 neighbouring nuclei.