نبذة مختصرة : A rotational band has been observed in 251Md using RITU and the $\gamma$-ray spectrometerJurogam at the University of Jyvaskyla. Interpreted as having a 1/2-configuration, this is the first firmly established rotational band in an odd-Z transfermiumnucleus. In order to disentangle the single-particle structure, the $\alpha$ decayof 255Lr has been studied both at Jyvaskyla and at GANIL. From the preliminaryanalysis, we have observed for the first time the $\alpha$ decay fine structure of 251Mdand two excited states in 247Es. Four $\alpha$ lines from the 255Lr decay have beenobserved, originating from two initial states, which establishes the ordering of thelevels.
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