L X-RAYS FROM 64 MEV IODINE PROJECTILES IN COLLISION WITH VARIOUS GASTARGETS

L x-rays from 64 MeV iodine projectiles in collision with various gas targets, Z(2) less than or equal to 36, have been studied. The x-ray i ntensity ratio L beta(1)/L alpha is found to be weakly dependent on Z( 2) between N-2 and Ar, in contrast to a sharp decrease between C and A l, reported by Dart et al using thick solid targets. Differences in th e measured L beta(1)/L alpha intensity ratio of iodine with 7+ and 24 charge states impinging on Kr target establishes the minor role of th e electrons in the N shell of the projectile in the x-ray production m echanism. The data also support the MO correlation rule of Eichler et Lll for the asymmetric collision systems.