Double ionization of helium by impact of fast protons

L.U. ANCARANI, E.L. GAGGIOLI, M.J. AMBROSIO, D.M. MITNIK, AND G. GASANEO

Bochum

Congreso; 69th Annual Gaseous Electronics Conference; 2016

American Physical Society

In comparison with the electron impact case, fully differential cross sections for the double ionization of helium by proton impact have been little investigated.The reasons are quite simple: experimentally, the measurement requires a long time as the count rates are very low; theoretically, the full four-body problemposes a formidable challenge. The present theoretical investigation is a contribution towards understanding this process. We performed [1] ab initio first Borncalculations for proton impinging with 6 MeV, in the experimental configuration investigated in [2]. We solve a three-body scattering driven equation with theGeneralized Sturmian Functions method [3]. Using the asymptotic behavior of the solution, we extract directly the transition matrix and thus thecorresponding fully differential cross section. A detailed comparison with the relative experimental data will be presented at the conference