Analysis of the energy autocorrelation functions in dissipative heavy ion collision of Al-27+Al-27

The excitation functions of the dissipative fragments emitted from the reac tion of Al-27 + Al-27 have been measured in the energy region from 114MeV t o 127MeV in steps of 200keV. The detection system covered continuous angles from 10 degrees to 57 degrees in laboratory system. The energy autocorrela tion functions of the dissipative fragments have been analyzed by using dif ferent approaches, especially using the statistical nuclear reaction model with memory. The results indicate that the intermediate dinuclear system fo rmed in the dissipative process is set in a damped coherent nuclear rotatio n which causes the nonself-averaging oscillation structure in the excitatio n functions and originates from a typical quantum chaotic motion.