INVESTIGATION OF THE DYNAMICS OF DISSIPATIVE U-ELECTRON SPECTROSCOPY(AU COLLISIONS WITH DELTA)

delta-electron emission in elastic and dissipative collisions of U+Au at E/A = 8.65 MeV has been investigated. The velocity vectors of the r eaction products were measured in coincidence with electrons of energi es up to 3.2 MeV. The delta-electron yield measured for elastic collis ions is in good agreement with coupled-channels calculations. The delt a-electron spectra of dissipative reactions show a clear dependence on the violence of the collision, i.e. the total kinetic energy loss (TK EL). The shape of the spectra are analysed with an atomic model by a f itting procedure using phenomenological trajectories. The results indi cate an increasing contact time of the united system with increasing t otal kinetic energy loss reaching 1.16(4) x 10(-21) s at <TKEL> = 375 MeV.