ZERO-DEGREE BINARY ENCOUNTER ELECTRON PRODUCTION IN 30 MEV BARE O8-2,HE, NE, AR, KR AND XE( IN COLLISIONS WITH H)

Double differential cross-sections for the production of binary encoun ter electrons were measured for collisions of 30 MeV bare O8+ projecti les with H-2, He, Ne, Ar, Kr and Xe targets at an electron ejection an gle of theta = theta = 0 degrees with respect to the beam direction. R esults were analyzed in terms of the impulse approximation (IA), in wh ich target electrons in the projectile frame undergo 180 degrees Ruthe rford scattering in the held of the bare projectile ion. Excellent agr eement with the data was found for the H-2 and He targets, while for t he multi-electron targets good agreement was established only when tar get electrons whose velocities were lower than the projectile velocity were included in the calculation.