Radiative Electron Capture (REC) as an Indicator of the K-Vacancy State of Highly Ionized Projectiles in Solids: Application to Stopping Power

Radiative electron capture (REC) has been studied at the Tandem Accelerator Center,Tsukuba University. The NEC 12 UD tandem and sputter ion source provided na beams of Clq+ ranging from 17+, 16+, 10+, 8+ and 7+ at energies of 120,95 and 80-MeV which were incident on C targets of varying thickness. The object of this work was to extend to higher energies and charge states the REC target thickness studies which had been done at TUNL. In this report the data on REC cross sections, centroid energies and widths vs. target thickness are given and discussed qualitatively. The relevance of such studies to target thickness dependence of stopping power is demonstrated.