Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 26: Poster: Interaction of matter and collisions with ions
A 26.5: Poster
Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais
Single differential projectile ionization cross sections for 50 AMeV U28+ in the ESR storage ring — •Siegbert Hagmann1,2, Pierre-Michel Hillenbrand1,3, Carsten Brandau2,4, Alexander Gumberidze4, Dalong Guo5,6, Michael Lestinsky1, Yuri Litvinov1,7, Alfred Müller3, Stefan Schippers3, Uwe Spillmann1, Sergey Trotsenko1,8, Thomas Stöhlker1,8,9, Shahab Sanjari4, Nicolas Winckler1, and Weidong Chen1 — 1GSI Darmstadt — 2Inst. f. Kernphysik, Uni Frankfurt — 3Univ. Giessen — 4EMMI-GSI-Darmstadt — 5IMP Lanzhou, China — 6Univ. Beijing, China — 7Univ. Heidelberg — 8Helmholtz Inst. Jena — 9Univ. Jena
For a thorough understanding of beam loss for low q high Z beams with 2.6AGeV in SIS100 it is imperative that the mechanisms active in projectile ionization be understood quantitatively to provide benchmarks for advanced ab initio theories beyond first order. We have embarked on an experimental investigation of single differential projectile ionization cross sections SDCS dσ/dEe for single and multiple ionization of U28+ in the ESR storage ring by measuring the electron loss to continuum (ELC) cusp at 0 degree with respect to the beam axis employing our imaging forward electron spectrometer. This was motivated by the high relative fraction of multiple ionization estimated by theory to exceed 40%. We report first results for absolute projectile ionization SDCS for U28+. We find a remarkably high asymmetry for the ELC cusp. This is at strong variance with the line shape expected for validity of first order theories.