Relativistic cross sections of positron-impact ionization of heliumlike ions - art. no. 062711

Relativistic single-differential and total cross sections of positron-impac t ionization for ions in the helium isoelectronic sequence: He, Li+, C4+, N a9+, Fe24+, and Ag45+, are calculated in the two-potential distorted-wave a pproximation. Two models are used to account for the mutual screening of th e scattered positron and the ejected electron. Results are compared with av ailable theoretical and experimental data. The systematics of ionization cr oss sections along the isoelectronic sequence is also studied.