Theoretical study of charge-exchange processes in collisions of highly-charged ions with Helium atoms

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1. We collected the data of experiments and calculations for electron capture processes in collisions of highly-charged ions with neutral atoms. A book of bibliography was published.2. The electron capture corss sections in collisions of O^<6+> ion with He were calculated. The results indicate: (1) The electron capture is dominated by the radial couplings between initial channel and O^<5+>(31) channels at R - 5 au ; (2) In the intermediate velocity region our results are good agreement with the calculated results using atomic orbital method ; (3) It is found that in lower velocity region our calculation explains the mechanism more successfully than other calculations ; (4) In lower velocity region we must use a Coulomb trajectory for heavy particle motions.3. In order to study the dependence of electron capture cross sections on projectile- and target-particles the potential energies were calculated for (Be^<q+>+He), (Be^<q+>+H) and (B^<q+>+He) systems. We calculated the cross sections for (Be^<3+>+H) system of them firstly. The results were very interesting so that we contributed them to a journal. Furthermore the calculation for the (B^<3+>+He) system is now in progress. This system is rare example in which single and double electron capture processes can be considered only with ten-channel close coupling calculations.4. The differential cross sections and the alignments of single-electron capture processes for (Mg^<2+>+He) system were calculated.5. (N^<5+>+He) : The calculation of the potential energies and coupling matrix elements indicated that ten-channel were necessary in order to obtain the cross sections correctly. Calculations including two-double electron capture channels in addition to them is now in progress.