Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 41: Physik mit schweren Ionen IV
HK 41.4: Vortrag
Donnerstag, 20. März 2003, 14:30–14:45, E
Slowing down of rare isotopes in gas from very high energies — •M. Portillo1, H. Geissel1,2, S. Elisseev2, A. Fettouhi2, M. Maier1, W. Plass2, G. Savard3, C. Scheidenberger1,2, H. Weick1,2, M. Winkler1,2, and B. Zabransky3 — 1GSI, Planckstr. 1, D-64291 Darmstadt, Germany — 2Liebig-Univ. Giessen, D-35392, Giessen, Germany — 3Physics Division, ANL, Argonne, Illinois 60439, USA
Rare isotopes separated by the in-flight technique can be stopped in buffer gases to provide high quality beams at low energy. Since this method allows the particles of interest to remain ionized throughout, it offers more efficient access to isotopes of elements that are either too short-lived or refractory to be practical for isolating them by other methods, such as the well-known isotope separation on-line (ISOL) technique. The most challenging aspect is to slow down fragments from relativistic kinetic energies, such as those from the fragment separator (FRS) at GSI. We present a scheme in which the fragments are to be bunched in energy by the use of specially shaped degraders that are strategically located along the ion optical transport system. The ions are to be thermalized within a gas filled ion guide (gas-catcher) and ultimately extracted for studies at high vacuum environments. Here we present an overview of such a system that is to be tested at the FRS and intended for use at proposed facilities, such as the Super FRS at GSI and RIA in the USA.