Knock-on electron emission in relativistic ion-atom collisions

The authors used the Advanced Positron Spectrometer to measure the energy distribution and the angular distribution as well as the total cross section for knock-on electrons emitted during the collision of relativistic heavy ions with atomic targets. The measurements using U92+ and La57+ projectiles in a 1 GeV/nucleon range were performed at the Bevalac at Lawrence Berkeley National Laboratory while the measurements using 11 GeV/nucleon Au79+ ions were performed at the AGS accelerator at Brookhaven National Laboratory. Results for singly and doubly differential cross sections for various targets will be presented