Total projectile electron loss cross sections ofU28+ions in collisions with gaseous targets ranging from hydrogen to krypton

Abstract

Beam lifetimes of stored U 28þ ions with kinetic energies of 30 and 50 MeV=u, respectively, were measured in the experimental storage ring of the GSI accelerator facility. By using the internal gas target station of the experimental storage ring, it was possible to obtain total projectile electron loss cross sections for collisions with several gaseous targets ranging from hydrogen to krypton from the beam lifetime data. The resulting experimental cross sections are compared to predictions by two theoretical approaches, namely the CTMC method and a combination of the DEPOSIT code and the RICODE program.

Strong asymmetry of the electron-loss-to-continuum cusp of multielectronU28+projectiles in near-relativistic collisions with gaseous targets

“…Experimental total cross sections for multielectron projectile ionization [23][24][25][26] have been partially reproduced by various theories [27][28][29]. A strong contribution of multiple ionization was observed in Refs.…”

“…The ion beam current was measured by the beam current transformer. The target area density was determined from the pressure increase in the target dump measured by four calibrated vacuum gauges [26,43]. Due to uncertainties in the determination of the absolute scale of L int and the unknown electron detection efficiency e , the measured data are only relative cross sections, which were normalized to the absolute scale of the results of the theoretical calculations.…”

“…Please note that the complementary study of absolute total projectile ionization cross sections for the same collision systems is published in Ref. [26].…”

Electron loss from hydrogen-like highly charged ions in collisions with electrons, protons and light atoms

“…As was already mentioned, in this paper we intend also to consider electron loss from HCIs in collisions with hydrogen and helium. In this respect one should note that the electron loss in collisions with neutral atoms has been intensively studied (see, for example, [17][18][19][20][21][22], [3]). However, for the range of impact energies which are of interest for present study a proper theory for this process in collisions with very light targets, where the interaction with electrons of the target yields a very substantial contribution to the total loss, has not yet been presented.…”

“…With the advent of accelerators of relativistic heavy ions, in which the ions may reach velocities close to the speed of light c, much higher impact energies and projectile charge states had become accessible for experiments on ion-atom collisions (for very recent experiments in this field see e.g. [4][5][6]). Highly charged projectiles produced at accelerators of heavy ions often carry one or more bound electrons which can be excited or lost in collisions with atoms.…”