New applications for slowing down of high-energy heavy ions [Elektronische Ressource] / vorgelegt von Michael Maier

Es ist schwieriger, eine vorgefasste Meinung zu zertrümmern als ein Atom. Albert Einstein 1 2New applications for slowing down of high-energy heavy ions Inauguraldissertation zur Erlangung des Doktorgrades der Naturwissenschaften der Justus-Liebig-Universität Gießen Fachbereich 07 Physik, Mathematik und Informatik, Geographie vorgelegt von Michael Maier aus München Darmstadt, den 7. Juli 2004 3Abstract In this thesis the charge-state distribution and energy loss of relativistic nickel and xenon ions in the energy range from 30 to 500 MeV/u were studied. The experiments were performed using the magnetic spectrometer FRS at GSI. In several experimental runs the slowing down data for nickel and xenon ions in various target materials ranging from Z = 4 to 79 was measured. The main goal of this experiment was to obtain slowing-down data above 30 MeV/u to improve predictions in this energy regime. Furthermore a technique to reduce the momentum spread of relativistic nickel and cobalt fragments, called “range focusing”, was investigated. The range-focusing technique was examined to improve the efficiency of stopping relativistic ion beams produced in fragmentation reactions in thin layers of matter. This technique, to thermalize ions for high precision experiments is an essential part for low energy experiments of future in-flight separators.