K-vacancy production in heavy-ion collisions. I. Experimental results forZ≥35projectiles

Target and projectile K x-ray production by 100, 160, and 200 MeV Nb collisions with thick solid targets

“…The [3]. This dependence of the cross-sections on projectile energy was used to interpolate our reported K x-ray cross-sections (see Fig.…”

“…The K x-ray cross-sections (projectile and target) dependence on the projectile energy can be fitted to an exponential of the form : as already shown [3]. The [3].…”

“…In particular, K-shell ionization has been studied extensively for light [1] and heavy projectiles [2], at both low [3] and relativistic velocities [4]. However, even today, a complete theory that can predict K-vacancy production cross-sections for all collision systems, based on first principles, is still lacking [5].…”

“…For Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphys:01990005108073500 atoms respectively, both direct excitation mechanism and electron capture [6] are the dominant ways of producing a K vacancy in the lighter collision partner. At rather low projectile velocities (vp « v2K) and nearly symmetric collision systems (Zp -Zt ), the molecular model [3,[7][8][9] gives a good description of K vacancy production via the promotion of electrons from the K-shell to higher orbitals. In the case of direct Coulomb excitation, the ECPSSR theory that includes corrections for the Coulomb trajectory, the relativistic effects, and projectile energy loss in the target [10], seems to reproduce the measured cross-sections quite well for many collision systems [1].…”

“…Following Meyerhof et al [3,9], this data can be tentatively divided into three regions. The bell shaped central region (22 --Zt ,-62) having a near exponential dependence on Z1' and the regions with Zt « ZP = 41 or Zt > ZP = 41, for which, with the exception of Erbium (Zt = 68), the measured cross-sections vary rather smoothly with Zt (see Fig.…”