Hamburg 2009 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 8: Speicherringe, ICP-MS, Neue Entwicklungen
MS 8.1: Talk
Wednesday, March 4, 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. Winckler1,2, K. Beckert1, F. Bosch1, D. Boutin1,2, C. Brandau1, L. Chen1,2, C. Dimopoulou1, H.G. Essel1, B. Fabian2, Thomas Faestermann3, H. Geissel1,2, E. Haettner2, S. Hess1, P. Kienle3,4, Ronja Knoebel1,2, C. Kozhuharov1, J. Kurcewicz1, N. Kuzminchuk2, S.A. Litvinov1,2, Y.A. Litvinov1,2, 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. Scheidenberger1,2, U. Spillmann1, M. Steck1, T. Stoehlker1, B. Sun1,7, 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.