Proton spectra in coincidence with super- and hyper-deformed structures in 152Dy

The hyperdeformed ridge structure recently observed in the reaction of 187 MeV 37 Cl on 120 Sn has been confirmed in a new proton-γ coincidence experiment at the GASP spectrometer and assigned to the nucleus 152 Dy. Proton spectra have been measured in coincidence with γ-rays belongings to the different structures in 152 Dy (oblate, prolate, super- and hyper-deformed). The deformation of the final evaporation residue affects only weakly the proton evaporation from the compound nucleus. Evidence has been found that the energy of the protons in coincidence with the hyperdeformed structure is larger than expected. This effect is discussed in the framework of the fission-evaporation competition.