Slowing down of relativistic few-electron heavy ions

Weick, H Geissel, H Scheidenberger, C Attallah, F Baumann, T Cortina, D Hausmann, M Lommel, B Munzenberg, G Nankov, N Nickel, F Radon, T Schatz, H Schmidt, K Stadlmann, J Summerer, K Winkler, M Wollnik, H

H. Weick et al., Slowing down of relativistic few-electron heavy ions, NUCL INST B, 164, 2000, pp. 168-179

38

INGLESE

Article

Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement

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

0168-583X → ACNP

164

2000

168 - 179

ISI

0168-583X(200004)164:<168:SDORFH>2.0.ZU;2-Z

Experimental data on energy loss and energy-loss straggling of fully ionize d relativistic heavy ions agree well with the theory of Lindhard and Sorens en (LS). However. when heavy ions penetrate matter with many fluctuating io nic charge states the theoretical description is more complicate and less a ccurate. A novel exploratory step to contribute to a better understanding o f the slowing down of heavy ions has been done with the present experiment in an energy region where the atomic interaction is still dominated by bare and few-electron projectiles. In the energy range of 100-1000 MeV/u we mea sured with the high-resolution magnetic spectrometer FRS the stopping power s. the energy-loss straggling and the charge-state distributions of Au-197, Pb-208 and Bi-209 projectiles in charge-state equilibrium interacting with solids ranging from beryllium to lead targets. Additionally, charge exchan ge cross-sections have been measured to support a better analysis and inter pretation of the energy-loss data. The experimental results on stopping pow er and energy-loss straggling clearly demonstrate the contribution of ions in different charge states. A novel application of the slowing down of rela tivistic exotic heavy ions is presented. (C) 2000 Elsevier Science B.V. All rights reserved.