No abstract

A previously unexploited experimental observable is used to explore emission times for intermediate mass fragments relative to directly emitted H and H particles. Small-angle correlations are reported in central collisions for 348 MeV Ar + ""Ag. High-velocity H and H particles follow a direct emission scenario with mean lifetime 7 -30 -60 fm/c. Fragmentation to Li is characterized by r -120 fm/c. Current model calculations suggest a delay time of -100 -200 fm/c for expansion

No abstract

Measurements are reported for fragment masses and velocities from the reactions (17-115)A MeV 40 ArϩCu, Ag, and Au. Charged particle multiplicities were used to select the most violent reactions, and systematics are reported for the momentum and energy deposition. These reactions are fusionlike for Շ44A MeV 40 Ar with a large fraction of momentum and energy deposition in the heavy nuclear system. However, for տ44A MeV 40 Ar, a majority of the projectile energy and momentum is carried away by a multibody spray of light ejectiles and only a minority is deposited in the heavy nucleus. Nevertheless heavy composite systems are formed with up to 9-12 MeV per source nucleon for 115A MeV 40 Ar.