Study of dissipative collisions of Ne20 (a7-11MeV/nucleon)+ Al27

The inclusive energy distributions of complex fragments (3 ≤ 9) emitted in the reactions 20 Ne (145, 158, 200, 218 MeV) + 27 Al have been measured in the angular range 10°-50°. The fusion-fission and the deep-inelastic components of the fragment yield have been extracted using multiple Gaussian functions from the experimental fragment energy spectra. The elemental yields of the fusion-fission component have been found to be fairly well explained in the framework of the standard statistical model. It is found that strong competition occurs between the fusion-fission and the deep-inelastic processes at these energies. The time scale of the deep-inelastic process was estimated to be typically in the range of ∼10 -21 -10 -22 s, and it was found to decrease with increasing fragment mass. The angular momentum dissipations in the fully energy damped deep-inelastic process have been estimated from the average energies of the deep-inelastic components of the fragment energy spectra. The estimated angular momentum dissipations, for lighter fragments in particular, are found to be greater than those predicted by the empirical sticking limit.