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Preparing a journey to the east of 208Pb with ISOLTRAP: Isobaric purification at A = 209 and new masses for 211-213Fr and 211Ra |
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| Authors: | M Kowalska S Naimi J Agramunt A Algora G Audi D Beck B Blank K Blaum Ch B?hm M Breitenfeldt E Estevez L M Fraile S George F Herfurth A Herlert A Kellerbauer D Lunney E Minaya-Ramirez D Neidherr B Olaizola K Riisager M Rosenbusch B Rubio S Schwarz L Schweikhard U Warring |
| Institution: | 1. Physics Department, CERN, 1211, Geneva 23, Switzerland 2. CSNSM-IN2P3-CNRS, Université de Paris Sud, Orsay, France 3. IFIC, CSIC-Universidad de València, València, 46071, Spain 4. Institute of Nuclear Research of the Hungarian Academy of Sciences, 4026, Debrecen, Hungary 5. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrasse 1, 64291, Darmstadt, Germany 6. CENBG, Université Bordeaux 1/CNRS/IN2P3, 33175, Gradignan Cedex, France 7. Max-Planck-Institut für Kernphysik, 69117, Heidelberg, Germany 9. Institut für Physik, Ernst-Moritz-Arndt-Universit?t, 17487, Greifswald, Germany 10. Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense, 28040, Madrid, Spain 8. Institut für Physik, Johannes Gutenberg-Universit?t, 55099, Mainz, Germany 11. Department of Physics and Astronomy, University of Aarhus, 8000, Aarhus, Denmark 12. NSCL, Michigan State University, East Lansing, MI, USA |
| Abstract: | With the Penning trap mass spectrometer ISOLTRAP, located at ISOLDE/CERN, preparatory work has been performed towards mass and decay studies on neutron-rich Hg and Tl isotopes beyond N = 126 . The properties of these isotopes are not well known because of large isobaric contamination coming mainly from surface-ionised Fr. Within the studies, production tests using several target-ion source combinations were performed. It was furthermore demonstrated around mass number A = 209 that the resolving power required to purify Fr is achievable with ISOLTRAP. In addition, masses of several isobaric contaminants, 211-213Fr and 211Ra , were determined with a three-fold improved precision. The results influence masses of more than 20 other nuclides in the 208Pb region. |
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