OPTICAL-MODEL ANALYSES OF 1.65 A GEV ARGON FRAGMENTATION - CROSS-SECTIONS AND MOMENTUM DISTRIBUTIONS

An optical potential fragmentation model capable of predicting fragmen tation cross sections and fragment momentum distributions is used to a nalyze recent measurements of 1.65 A GeV argon projectiles fragmenting in carbon and potassium-chloride targets obtained with the Heavy Ion Spectrometer System (HISS) at the Lawrence Berkeley Laboratory Bevalac . The theoretical model uses an abrasion-ablation-FSI (frictional spec tator interaction) collision formalism to estimate elemental and isoto pic production cross sections for comparsion with the measured values. The collision momentum transfer model is incorporated into a Goldhabe r formalism to analyze measured transverse and longitudinal distributi ons of the projectile fragments. Good agreement between theory and exp eriment is obtained for all observables.