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We study the electron-loss-to-continuum (ELC) cusp experimentally andtheoretically by comparing the ionization of U$^{89+}$ projectiles incollisions with N$_2$ and Xe targets, at a beam energy of 75.91 MeV/u. Thecoincidence measurement between the singly ionized projectile and the energy ofthe emitted electron is used to compare the shape of the ELC cusp at weak andstrong perturbations. A significant energy shift for the centroid of theelectron cusp is observed for the heavy target of Xe as compared to the lighttarget of N$_2$. Our results provide a stringent test for fully relativisticcalculations of double-differential cross sections performed in the first-orderapproximation and in the continuum-distorted-wave approach.

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