https://doi.org/10.1140/epja/i2009-10835-1
Regular Article - Experimental Physics
Preparing a journey to the east of 208Pb with ISOLTRAP: Isobaric purification at A = 209 and new masses for 211-213Fr and 211Ra
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
8
Institut für Physik, Johannes Gutenberg-Universität, 55099, Mainz, Germany
9
Institut für Physik, Ernst-Moritz-Arndt-Universität, 17487, Greifswald, Germany
10
Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense, 28040, Madrid, Spain
11
Department of Physics and Astronomy, University of Aarhus, 8000, Aarhus, Denmark
12
NSCL, Michigan State University, East Lansing, MI, USA
* e-mail: kowalska@cern.ch
Received:
5
January
2009
Revised:
12
May
2009
Accepted:
17
June
2009
Published online:
26
July
2009
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.
© SIF, Springer-Verlag Berlin Heidelberg, 2009