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MS: Fachverband Massenspektrometrie

MS 1: Präzisionsmassenspektrometrie, Ionenfallen, FT-IZR-MS, Moleküle, Cluster I

MS 1.2: Invited Talk

Monday, March 2, 2009, 11:15–11:45, VMP 8 R05

Recent activities and results at the Penning-trap mass spectrometer ISOLTRAP — •M. Kowalska¹, G. Audi², D. Beck³, Klaus Blaum⁴, M. Breitenfeldt⁵, Ch. Böhm⁶, Ch. Borgmann⁴, S. George⁴, Frank Herfurth³, A. Herlert¹, A. Kellerbauer⁴, D. Lunney², E. Minaya-Ramirez², S. Naimi², D. Neidherr⁶, M. Rosenbusch⁵, S. Schwarz⁷, Lutz Schweikhard⁵, and U. Warring⁴ — ¹CERN, Geneva, Switzerland — ²Université de Paris Sud, Orsay, France — ³GSI Darmstadt, Germany — ⁴MPI für Kernphysik Heidelberg, Germany — ⁵Ernst-Moritz-Arndt-Universität Greifswald, Germany — ⁶Johannes Gutenberg-Universität Mainz, Germany — ⁷NSCL MSU, East Lansing, USA

The Penning-trap mass spectrometer ISOLTRAP located at ISOLDE/CERN, with its high performance and ability to address nuclides with production yields of a few 100 ions/s and half-lives below 100 ms, is a powerful tool to investigate the nuclear binding energies. To its recent scientific highlights belong the masses of the proton halo candidate ¹⁷Ne, ^132,134Sn relevant for the r process in nucleosynthesis and magicity of N = 82, and ^223−229Rn revealing a unique behaviour of the double-mass differences proportional to the interaction of the last proton and neutron. 2008 gave also the first discovery of a nuclide in a Penning trap, namely ²²⁹Rn. Technical activities included the C-cluster ion source, new excitation schemes in the purifying trap - to increase mass selectivity, studies of systematic effects - to lower the present residual systematic uncertainty, and tests of tape-station system for decay-spectroscopy studies on isobarically-purified samples.