Hamburg 2009 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 8: Speicherringe, ICP-MS, Neue Entwicklungen

MS 8.5: Vortrag

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

Electron-capture decay probability for highly-charged single ions — •Nicolas Winckler for the GSI-oscillations collaboration — Gesellschaft für Schwerionenforschung GSI, 64291 Darmstadt, Germany — Justus-Liebig-Universität Gießen, 35392 Gießen, Germany

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.