Mainz 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 9: Nukleare Astrophysik

HK 9.9: Vortrag

Montag, 19. März 2012, 18:45–19:00, RW 2

Half-life measurements for neutral and highly-charged α-emitters — •Fabio Farinon — GSI, 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. Tiny changes in Q-values and α-decay half-lives of fully stripped ions are expected and can provide information on 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. ²¹³Fr⁸⁶⁺ have been investigated 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.