Systematic study of impact parameter dependent K-vacancy probabilities in near symmetric gas- and solid-target collision systems

Abstract

K-vacancy production probabilitiesPK(b) were measured with gas and solid targets byK-x-ray particle coincidences (impact parameterb is determined by the particle detection angle) in the region of light (ZP≃ZT≃10) up to intermediate heavy (ZP≃ZT≃36) collision systems. The measuredPK(b) reveal a very strong difference in shape between solid and gas targets independent ofZ. Only thePK(b) measured with gas targets and those measured with solid targets at very small impact parameters show reasonable good agreement with the 2pπx-2pσ rotational coupling model. At largeb thePK(b) from solid targets are strongly influenced by a multiple collision effect, where projectileL-vacancies seem to be produced in collisions beforeK-vacancy production. However, this effect cannot be understood just by a two collision process whereL-vacancy production and 2pπx-2pσ rotational coupling occurs in consecutive collisions.