GANIL-EXP, GANIL E375International audienceSpectroscopy of the proton-odd transfermium isotopes 247Es, 251Md and 255Lr has been performed using decay and in-beam techniques. Single particle states have been studied at GANIL and the University of Jyväskylä using spectroscopy after α decay of 255Lr. Prompt gamma-ray spectroscopy of 251Md and 255Lr was performed at Jyväskylä using the Jurogam array coupled to the RITU separator. These experimental results are compared to new Hartree--Fock--Bogoliubov calculations. Future prospects for the study of the heaviest elements at GANIL with the existing facility and the future SPIRAL2 and LINAG beams are presented
