Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Kernphysik / Spektroskopie I

HK 48.4: Vortrag

Freitag, 14. März 2008, 15:00–15:15, 2E

Experimental Results from Isochronous Mass Measurements for Neutron-Rich Fission Fragments at the FRS-ESR Facility — •Ronja Knöbel for the IMS collaboration — Gesellschaft für Schwerionenforschung GSI, 64291 Darmstadt, Germany — Justus-Liebig-Universität Gießen, 35392 Gießen, Germany

Accurate mass measurements of exotic nuclei help to deepen our understanding of basic nuclear properties such as shapes and pairing correlations, shell structure and the limits of their existence. Masses of very neutron-rich isotopes are also needed to investigate the possible path of the astrophysical r-process of nucleosynthesis. The combination of the fragment separator FRS and the cooler-storage ring ESR gives us the unique possibility to perform high-accuracy mass and lifetime measurements of exotic nuclei. For measuring masses of nuclei with half-lives down to several tens of microseconds the ESR is operated in the isochronous mode. More than 60 new neutron-rich masses of ²³⁸U-fission fragments have been measured recently. The experimental setup, the data analysis and first results will be presented.