DOUBLE EXCITATION OF HELIUM ATOMS IN COLLISIONS WITH HEAVY IONS

César A. Ramírez# , Vladimir D. Rodríguez* and Roberto D. Rivarola#

# Instituto de Física de Rosario, (CONICET and UNR), Av. Pellegrini 250,
2000 Rosario, Argentina.
* Departamento de Física, FCEyN, UBA, 1428 Buenos Aires, Argentina

The four body-symmetric eikonal model is introduced in its impact parameter

approximation in order to study double excitation of He atoms by impact of 
protons and multicharged ions Cq+ (q=4-6) and Fq+ (q=7-9) at intermediate 
and high collisions energies. Differential and total cross sections are 
calculated and compared with existing theoretical and experimental data.