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MS: Fachverband Massenspektrometrie

MS 8: Speicherringe, ICP-MS, Neue Entwicklungen

MS 8.1: Vortrag

Mittwoch, 4. März 2009, 14:00–14:15, VMP 8 R05

Time dependence of two-body weak decays of highly-charged single ions in the ESR Storage Ring of GSI Darmstadt — •N. Winckler^1,2, K. Beckert¹, F. Bosch¹, D. Boutin^1,2, C. Brandau¹, L. Chen^1,2, C. Dimopoulou¹, H.G. Essel¹, B. Fabian², Thomas Faestermann³, H. Geissel^1,2, E. Haettner², S. Hess¹, P. Kienle^3,4, Ronja Knoebel^1,2, C. Kozhuharov¹, J. Kurcewicz¹, N. Kuzminchuk², S.A. Litvinov^1,2, Y.A. Litvinov^1,2, L. Maier³, M. Mazzocco¹, F. Montes¹, P. Moritz¹, A. Musumarra⁵, C. Nociforo¹, F. Nolden¹, T. Ohtsubo⁶, W. Plass², A. Prochazka¹, R. Reda⁴, R. Reuschl¹, C. Scheidenberger^1,2, U. Spillmann¹, M. Steck¹, T. Stoehlker¹, B. Sun^1,7, T. Suzuki⁸, S. Torilov⁹, M. Trassinelli¹⁰, H. Weick¹, M. Winkler¹, D. Winters¹, and T. Yamaguchi⁸ — ¹Gesellschaft für Schwerionenforschung GSI, Darmstadt, Germany — ²Justus-Liebig-Universität Gießen, Gießen, Germany — ³Technische Universität München, Garching, germany — ⁴Stefan Meyer Institut für subatomare Physik, Vienna, Austria — ⁵INFN-LNS Catania, Italy — ⁶Department of Physics, Niigata university, Niigata, Japan — ⁷Peking University, Beijing, China — ⁸Department of Physics, Saitama university, Saitama, Japan — ⁹St. Petersburg State University, St. Petersburg, — ¹⁰Institut des NanoSciences de Paris, CNRS-UPMC, Paris, France

Nuclear decay properties have been well established from the studies of neutral atoms. However, the decay modes of highly-charged ions can be dramatically modified. Experimental studies can be performed in ion-storage rings or ion traps where the high-vacuum conditions are the prerequisite to preserve high charge states.

In this contribution we discuss experiments on orbital electron capture (EC) decay of hydrogen-like ions. These experiments have been performed at the FRS-ESR facility of GSI. Hydrogen-like ¹⁴⁰Pr, ¹⁴²Pm, and ¹²²I ions have been separated in-flight by the FRagment Separator FRS and injected, stored and cooled in the Experimental Storage Ring ESR. Using time-resolved Schottky Mass Spectrometry, a non-destructive and highly sensitive technique, the fate of each stored ion can be investigated.

Decay events accounting for nuclear electron capture processes have been unambiguously identified and the time between production and decay has been measured. The obtained results show a significant deviation from the expected exponential decay. The interpretation of this effect is widely disputed in literature and will be discussed.