NONLOCAL TIME-SPACE COHERENT STRUCTURES IS DISSIPATIVE HEAVY-ION COLLISIONS FROM THE ANALYSIS OF EXCITATION-FUNCTION FLUCTUATIONS

We study the implications of the correlations between fluctuating S-ma trix elements with different spin (and parity) values in dissipative h eavy-ion collisions. We demonstrate the possibility to probe the time- irreversible stage of the collision by analyzing excitation function f luctuations. We interpret the quasiperiodicity of fluctuations, anomal ously large coherent angles and strong macrochannel cross correlation observed in dissipative heavy-ion collisions in terms of the formation of nonlocal time-space coherent structures due to the dissipation of spin interference. The rate of quantum spin decoherence is given by th e Lyapunov exponent which marks quantum chaos to be the origin of the phenomenon.