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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.65: Poster

Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max

α-decay half-lives for neutral atoms and bare nuclei — •F. Farinon — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — Justus-Liebig-Universität, Gießen, Germany

The influence of the bound electron cloud on the α-decay constant λ has been discussed theoretically since the late 50s. Precise Q-values and α-decay half-lives of fully stripped ions are important to obtain an unambiguous determination of the electron screening energy, thereby deducing reliable reaction rates in stellar environments. Recently, the measurements of α-decay half-lives are feasible also for highly-charged radioactive nuclides. Using a ²³⁸U beam at relativistic energies at the present FRS-ESR facility at GSI it is possible to produce, efficiently separate and store highly charged α-emitters. Few candidates have been selected for the proposed investigations and will be studied by using the Schottky Mass Spectrometry technique. In order to establish a solid reference data set, lifetime measurements of the corresponding neutral atoms have been performed directly at the FRS by implanting the separated ions into an active silicon stopper. These results will be reported.