title: Towards high-resolution laser ionization spectroscopy of the heaviest elements in supersonic gas jet expansion.
abstract: Resonant laser ionization and spectroscopy are widely used techniques at radioactive ion beam facilities to produce pure beams of exotic nuclei and measure the shape, size, spin and electromagnetic multipole moments of these nuclei. However, in such measurements it is difficult to combine a high efficiency with a high spectral resolution. Here we demonstrate the on-line application of atomic laser ionization spectroscopy in a supersonic gas jet, a technique suited for high-precision studies of the ground- and isomeric-state properties of nuclei located at the extremes of stability. The technique is characterized in a measurement on actinium isotopes around the N=126 neutron shell closure. A significant improvement in the spectral resolution by more than one order of magnitude is achieved in these experiments without loss in efficiency.
authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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authors.initials: R
authors.lastname: Ferrer
authors.affiliation: Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, 188300 Gatchina, Russia.
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authors.initials: A
authors.lastname: Barzakh
authors.affiliation: GANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, 14076 Caen Cedex 05, France.
authors.forename: B
authors.initials: B
authors.lastname: Bastin
authors.affiliation: Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany.|Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, D-07743 Jena, Germany.
authors.forename: R
authors.identifier: 0000-0001-5100-4229
authors.initials: R
authors.lastname: Beerwerth
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.|Helmholtz Institute Mainz, 55099 Mainz, Germany.|Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, Fritz-Strassmann-Weg 2, 55128 Mainz, Germany.
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authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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authors.lastname: Creemers
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
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authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
authors.forename: R
authors.initials: R
authors.lastname: de Groote
authors.affiliation: GANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, 14076 Caen Cedex 05, France.
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authors.lastname: Delahaye
authors.affiliation: Normandie Univ, ENSICAEN, UNICAEN, CNRS/IN2P3, LPC Caen, 14000 Caen, France.
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authors.initials: X
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authors.affiliation: Institute de Physique Nucléaire (IPN) d'Orsay, 91406 Orsay Cedex, France.
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authors.lastname: Franchoo
authors.affiliation: Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany.|Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, D-07743 Jena, Germany.
authors.forename: S
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authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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authors.initials: LP
authors.lastname: Gaffney
authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.|SCK·CEN, Belgian Nuclear Research Center, Boeretang 200, 2400 Mol, Belgium.
authors.forename: L
authors.initials: L
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authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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authors.initials: W
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authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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authors.lastname: Granados
authors.affiliation: Institut für Physik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany.
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authors.affiliation: GANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, 14076 Caen Cedex 05, France.
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authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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authors.affiliation: Institut für Physik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany.
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authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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authors.lastname: Kudryavtsev
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.|Helmholtz Institute Mainz, 55099 Mainz, Germany.
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authors.affiliation: GANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, 14076 Caen Cedex 05, France.
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authors.affiliation: Université catholique de Louvain, Centre de Ressources du Cyclotron, B-1348 Louvain-la-Neuve, Belgium.
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authors.lastname: Loiselet
authors.affiliation: GANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, 14076 Caen Cedex 05, France.
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authors.affiliation: Department of Physics, University of Jyväskylä, PO Box 35 (YFL), Jyväskylä FI-40014, Finland.
authors.forename: I D
authors.initials: ID
authors.lastname: Moore
authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.|CERN, CH-1211 Genève, Switzerland.
authors.forename: Y
authors.initials: Y
authors.lastname: Martínez
authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.|Faculty of Mechanics and Mathematics, Lomonosov Moscow State University, Leninskie gory, 1, 119992 Moscow, Russia.
authors.forename: E
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authors.lastname: Mogilevskiy
authors.affiliation: Institut für Physik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany.
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authors.affiliation: GANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, 14076 Caen Cedex 05, France.
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authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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authors.affiliation: CERN, CH-1211 Genève, Switzerland.
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authors.identifier: 0000-0001-5727-7754
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authors.affiliation: GANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, 14076 Caen Cedex 05, France.
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authors.affiliation: Department of Physics, University of Jyväskylä, PO Box 35 (YFL), Jyväskylä FI-40014, Finland.
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authors.affiliation: GANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, 14076 Caen Cedex 05, France.
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authors.affiliation: GANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, 14076 Caen Cedex 05, France.
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authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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authors.affiliation: Institut für Physik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany.
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authors.affiliation: KU Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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