Unusual Behavior Of Projectile Fragments From The Interaction Of Copper With Relativistic Ar Ions

Projectile fragments formed in the interaction of 0.9A-GeV and 1.8A-GeV /sup 40/Ar ions with a Cu disk interact with a second Cu disk and the relative yields of products in the two disks are measured by radioactivation techniques as a function of the distance between them. The data at 1.8A-GeV demand either (1) decay in flight (t/sub 1/2/roughly-equal10/sup -10/ s) of some projectile fragments having large cross sections or (2) production of secondaries with unexpectedly large transverse momenta.