Radiative electron capture in heavy ion and He collisions

The X-ray spectra emitted during the radiative capture of target electrons into the projectile K shell have been measured under single collision conditions for a He gas target. The experiment was performed for 40–76 MeV F q + ( q = 8,9) and 120–175 MeV Cl q + ( q = 16,17) ions. The centroid energies of the radiative electron capture (K-REC) X-rays have been found to be in good agreement with the calculated ones. It is also confirmed that the widths of the K-REC X-ray distributions for Cl 17+ ion impact are in good agreement with the simple model calculations.