Characterization of very highly excited composite nuclei: Temperature, spin zone, radial extent, and lifetime scale of10−22s

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Abstract
Particle-particle coincidence measurements have been made for the reactions 312 and 680 MeV Ar40+natAg. The large-angle correlation data indicate essentially complete energy thermalization even for 680 Mev Ar40+natAg. They also allow for an assignment of ≊64ħ for the rms spin and ≊4.3 MeV for the average initial temperature of the composite nuclei formed by incomplete fusion. The small-angle correlation data for −11H and −22H are consistent with phase-space, statistical-model predictions of the evaporation lifetimes. This result implies that energy mixing and evaporation particle emission steps occur with intervals of ≊10−22 s, a time period comparable to the traversal time for a projectile velocity of 17 MeV/nucleon.

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