Timescale phenomena in fragmentation processes

The authors report correlations between intermediate-mass fragments (IMF) and heavy fragments measured for 18O induced reactions on natAg and 197Au at E/A=84 MeV. Both correlation functions of two fission products and of a heavy recoil in coincidence with an IMF show maxima at relative velocities vrel∼2-3 cm/ns and a depletion at vrel≤1 cm/ns, thus confirming the binary character of these processes. Coincidences between two IMF's show an anticorrelation at low relative velocities reflecting the proximity of the two IMF's at the point of creation