Production of highly charged rare-gas recoil ions by 1.4-MeV/amuU44+

Abstract

Recoil-ion-production cross sections in rare gases are measured for 1.4-MeV/amu ${\mathrm{U}}^{44+}$ ions and are calculated for 1-5-MeV/amu projectiles in charge state 44 + with the use of the classical-trajectory Monte Carlo method and the independent-electron model. The calculations reasonably predict the net-charge-production cross sections, which exceed ${10}^{-13\mathrm{}}$ ${\mathrm{cm}}^2$ for the heavy rare gases; the calculations are found to underestimate the cross sections for low-charge-state recoil ions and to overestimate the cross sections for high-charge-state recoil ions. The experimental cross sections for production of highly charged recoil ions are found to be large, e.g., greater than 1×${10}^{-16\mathrm{}}$ ${\mathrm{cm}}^2$ for production of ${\mathrm{Ne}}^{8+}$, ${\mathrm{Ar}}^{10+}$, ${\mathrm{Kr}}^{12+}$, and ${\mathrm{Xe}}^{18+}$.