Berlin 2005 – wissenschaftliches Programm

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SYAM: Atomare Präzisionsmassenspektrometrie

SYAM 1: Atomare Pr
äzisionsmassenspektrometrie

SYAM 1.2: Hauptvortrag

Montag, 7. März 2005, 10:30–11:00, HU Senatssaal

High-Precision Mass Measurements on Radionuclides in Storage Rings and Ion Traps — •H.-Jürgen Kluge — GSI, Darmstadt and Universität Heidelberg

Mass spectrometry is a very well established technique in many disciplines of pure and applied science. In nuclear physics, high-precision mass determinations are important to directly observe nuclear structure effects such as shell closures, pairing, onset of deformation or the limits of nuclear binding. In nuclear astrophysics, the mass of radionuclides is a crucial parameter for reliable calculations of nucleosynthesis processes. Furthermore, highly precise measurements of beta-decay energies are mandatory for nuclear-physics tests of the Standard Model as, for example, the verification of the conserved-vector-current hypothesis or the check of the unitarity of the quark mixing Cabibbo-Kobayashi-Maskawa matrix. In the last decade, new ideas have been realized for high-precision mass measurements of short-lived radionuclides which both use the principle of trapping and cooling. These were pioneered on the small scale of ion traps by setting up the triple-trap mass spectrometer ISOLTRAP at ISOLDE/CERN and on the large scale of storage rings by developing the Schottky and isochronous mass spectrometry for the experimental storage ring ESR at GSI/Darmstadt. In the mean time, a large fraction of all known masses in the chart of nuclei have been determined by both devices, and throughout the world many other Penning trap facilities at accelerators are operational, in the building-up stage, or planned.