Bonn 2010 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Struktur und Dynamik von Kernen VIII

HK 47.4: Talk

Thursday, March 18, 2010, 15:00–15:15, HG VII

Towards high-precision mass measurements of neutron-rich fission products at TRIGA-SPEC — •Szilard Nagy — Max-Planck-Institut für Kernphysik, 69117 Heidelberg — GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt

TRIGA-TRAP, the only Penning trap mass spectrometer worldwide at a nuclear research reactor, is installed at TRIGA Mainz as part of the TRIGA-SPEC experiment. The scientific goal is to perform high-precision mass measurements on lanthanoids, actinoids and neutron-rich fission products produced by thermal neutron induced fission of a target inside the reactor. High-precision mass data are scarce in this region of the nuclear chart, and further experimental data are needed for nuclear structure studies of heavy elements, to test the predictive power of nuclear mass models, or as input to nucleosynthesis calculations of the astrophysical r-process. Ions of certain lanthanoids and most actinoids as well as carbon clusters for calibration purposes can be routinely produced by a newly developed non-resonant laser ablation ion source, allowing off-line mass measurements. Besides fundamental research, TRIGA-TRAP serves as a test bench for the development of efficient ion detection techniques, which will enable mass measurements ultimately on a single ion with a half-life of the order of one second. To this end, a unique combination of the commonly used time-of-flight technique and the non-destructive image current detection method is realized in an on-line mass spectrometer. The first mass measurement results will be reported.