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

The excitation functions of the dissipative fragments emitted from the reaction of 27Al + 27Al have been measured in the energy region from 114 MeV to 127 MeV in steps of 200 keV. The detection system covered continuous angles from 10 degree to 57 degree in laboratory system. The energy autocorrelation functions of the dissipative fragments have been analyzed by using different approaches, especially using the statistical nuclear reaction model with memory. The results indicate that the intermediate dinuclear system formed in the dissipative process is set in a damped coherent nuclear rotation which causes the non self-averaging oscillation structure in the excitation functions and originates from a typical quantum chaotic motion