Lateral Ejection of Low Energy Protons in High Energy Heavy-Ion Collisions

摘要

The lateral ejections of low energy protons in E/sub L/ = 0.8 GeV/nucleon A + A collisions are systematically studied in terms of the nuclear cascade model, from the viewpoint of the mass number and charge-multiplicity dependences. The double differential cross sections for low energy (E/sub c/ < 100 MeV) protons indicate the peaking behavior around theta/sub c/ = 90 deg in higher multiplicity events than M = 60. The cascade model without the nuclear compressional effect can cause the lateral ejection of low energy protons in the higher multiplicity events, where the nucleons in the participant region are solely responsible for this ejection. High-density nucleons are formed in La + La central collisions, while Ar + KCl central collisions give only small disturbances to the nuclei. The energy spectra of laterally ejected protons have a very strong time-dependence in La + La central collisions. (Atomindex citation 18:067711)