2018 Impact factor 2.481
Eur. Phys. J. A 2, 337-342

Short note

## Electron screening in backward elastic scattering

F. Schümann1 - S. Zavatarelli2 - L. Gialanella1 - U. Greife1 - M. Junker1,3 - D. Rogalla1 - C. Rolfs1 - F. Strieder1 - H.P. Trautvetter1

1 Institut für Physik mit Ionenstrahlen, Ruhr-Universität, Bochum, Universitätsstr. 150, D-44780 Bochum, Germany
2 Dipartimento di Fisica, Università di Genova and INFN, Via Dolecaneso, I-16146 Genova, Italy
3 Laboratori Nazionali del Gran Sasso, I-67010 Assergi, Italy

Received: 25 May 1998 Communicated by B. Povh

Abstract
The elastic scattering cross sections, , for the systems He+Ta and He+W have been measured at and Elab=76.1 keV to 3.988 MeV using targets with a thickness of a few atomic layers. The results are smaller than the results given by the Rutherford scattering law, , due to the effects of electron screening and can be described by , where Ue is an atomic screening potential energy. The deduced average value,  keV, is consistent with the Moliére- and Lenz-Jensen-models as well as electron binding energies.

PACS
25.60.Bx Elastic scattering