Theoretical study of the double ionization of the He isoelectronic sequence by protons and antiprotons

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:283

Article

Lopez, S. D.^1,2  Garibotti, C. R.^1,2  Otranto, S.^3,4 

[1] Consejo Nacl Invest Cient & Tecn, RA-8400 San Carlos De Bariloche, Argentina

[2] Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Argentina

[3] Univ Nacl Sur, IFISUR, RA-8000 Bahia Blanca, Buenos Aires, Argentina

[4] Univ Nacl Sur, Dept Fis, RA-8000 Bahia Blanca, Buenos Aires, Argentina

关键词: Double ionization;    Fully differential cross sections;    Isoelectronic sequence of He;   

DOI  :  10.1016/j.nimb.2012.04.018

来源: Elsevier

【 摘 要 】

We evaluate the fully differential cross sections (FDCS) for the double ionization of the He-isoelectronic sequence by proton and antiproton impact. We use a distorted wave model recently introduced by the authors based on static and dynamically screened charges for the final continuum state. We identify three main collision mechanisms, which we denote as: back-to-back, recoil and binary emissions. We discuss the relative relevance in the FDCS of these mechanisms as the electron emission energies and nuclear charges are varied. We study the variation of the electronic angular distributions according to well established scaling rules for the electron momenta and energies. The dependence of the FDCS on the projectile charge sign is analyzed and found to become more relevant for increasing nuclear charges of the target. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

Free