Darmstadt 2008 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 6: Präzisionsmassenspektrometrie und grundlegende Anwendungen
MS 6.4: Talk
Tuesday, March 11, 2008, 15:30–15:45, 3E
Towards high-precision mass measurements of short-lived He, Li and Be nuclides at ISOLTRAP — •Dennis Neidherr1, Klaus Blaum1,2, Martin Breitenfeldt3, Frank Herfurth2, Alexander Herlert4, Magdalena Kowalska4, Sarah Naimi5, and Lutz Schweikhard3 — 1Johannes Gutenberg-Universität, 55099 Mainz, Germany — 2GSI, 64291 Darmstadt, Germany — 3Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany — 4CERN, 1211 Geneva 23, Switzerland — 5CSNSM, 91405 Orsay, France
Light nuclides are rather simple systems that can be calculated based on the basic nucleon-nucleon interaction . Some of these nuclei, like 6,8He, 11Li or 11Be, exhibit a very interesting halo structure which can be probed by study of their ground state properties, such as the magnetic moment or the charge radius. The double-Penning-trap mass spectrometer ISOLTRAP at ISOLDE/CERN can address another important ground state property, the mass, which is crucial to derive a precise value of the charge radius. To this end, the cyclotron frequency of the short-lived radionuclides is measured. The ions produced and delivered by ISOLDE with a kinetic energy of 60 keV are decelerated in several steps. In the first step a RFQ buncher is used to stop, accumulate and cool the quasi-continuous ion beam. For light nuclides hydrogen gas has to be used in the buncher instead of helium to keep up the efficiency of the cooling process that would be hampered by RF heating. First results for the transmission and cooling efficiency of stable 4He ions in the buncher, as well as simulation studies will be presented.