Hannover 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MS: Fachverband Massenspektrometrie
MS 2: Precision Mass Spectrometry and Fundamental Applications II
MS 2.2: Vortrag
Montag, 18. März 2013, 14:30–14:45, F 442
Mass separation with ISOLTRAP’s MR-ToF — •R. Wolf1, D. Atanasov2, D. Beck3, K. Blaum2, Ch. Böhm2, Ch. Borgmann2, M. Breitenfeldt4, R. B. Cakirli2,5, N. Chamel6, S. George1, S. Goriely6, F. Herfurth3, M. Kowalska7, S. Kreim2,7, D. Lunney8, V. Manea8, E. Minaya Ramirez3,9, S. Naimi10, D. Neidherr2,3, M. Rosenbusch1, L. Schweikhard1, J. Stanja11, F. Wienholtz1, and K. Zuber11 — 1Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald — 2Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt — 4Katholieke Universiteit, 3000 Leuven, Belgium — 5University of Istanbul, Istanbul, Turkey — 6Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, 1050 Brussels, Belgium — 7CERN, CH-1211 Geneva, Switzerland — 8CSNSM-IN2P3-CNRS, Université Paris-Sud, Orsay, France — 9Helmholtz-Institut Mainz, 55099 Mainz — 10RIKEN, Saitama 351-0198, Japan — 11Technische Universität Dresden, 01069 Dresden
A contaminant-free beam is a crucial condition for mass measurements of short-lived nuclides on an uncertainty level of δ m/m=10−8, as performed with ISOLTRAP at CERN-ISOLDE. The radioactive beam delivered by an ISOL facility contains a mixture of isobars, where far from stability the ions of interest often amount to only a minute fraction, drowned by contamination. ISOLTRAP has been upgraded with a multi-reflection time-of-flight (MR-ToF) mass analyzer and a Bradbury Nielsen gate, primarily intended as an auxiliary device to provide a faster purification of isobaric mixtures. Mass-resolving power of 105 and a contamination suppression of 104 have been reached in only a few tens of milliseconds, which decreases the purification period by over an order of magnitude compared to mass-selective buffer-gas centering in a dedicated Penning trap. On the one hand, the system can be used as the only mass separator and selector for very short-lived nuclides, where the buffer-gas filled Penning trap acts only for cooling and bunching. On the other hand, for intermediate half-lives and very high contamination to ion of interest ratios, several Penning-trap capture cycles can be performed to filter the few or even the only one ion of interest, for the actual mass measurement. This improves the ion-of-interest throughput by more than a factor of 10. The application of this method, e.g for the mass measurement of 82Zn and its astrophysical impact on the neutron-star crust, will be presented.