Electron-loss-to-continuum cusp in collisions of U$^{89+}$ with N$_{2}$ and Xe

Authors:
  • PHP. -M. Hillenbrand
    P. -M. Hillenbrand
  • KLK. N. Lyashchenko
    K. N. Lyashchenko
  • SHS. Hagmann
    S. Hagmann
  • OAO. Yu. Andreev
    O. Yu. Andreev
  • DBD. Banas
    D. Banas
  • EBE. P. Benis
    E. P. Benis
  • ABA. I. Bondarev
    A. I. Bondarev
  • CBC. Brandau
    C. Brandau
  • EFE. De Filippo
    E. De Filippo
  • OFO. Forstner
    O. Forstner
  • JGJ. Glorius
    J. Glorius
  • RGR. E. Grisenti
    R. E. Grisenti
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Abstract
We study the electron-loss-to-continuum (ELC) cusp experimentally and theoretically by comparing the ionization of U$^{89+}$ projectiles in collisions with N$_2$ and Xe targets, at a beam energy of 75.91 MeV/u. The coincidence measurement between the singly ionized projectile and the energy of the emitted electron is used to compare the shape of the ELC cusp at weak and strong perturbations. A significant energy shift for the centroid of the electron cusp is observed for the heavy target of Xe as compared to the light target of N$_2$. Our results provide a stringent test for fully relativistic calculations of double-differential cross sections performed in the first-order approximation and in the continuum-distorted-wave approach.