Development towards in-gas-jet laser spectroscopy studies of actinium isotopes at LISOL

Sebastian Raeder, Beyhan Bastin, M. Block, P. Creemers, P. Delahaye, Rafael Ferrer, X. Fléchard, Serge Franchoo, Lars Ghys, Liam Paul Gaffney, Camillo Granados, R. Heinke, L. Hijazi, Mark Huyse, Tobias Kron, Yuri Kudryavtsev, M. Laatiaoui, Nathalie Lecesne, F. Luton, Iain D. MooreYisel Martinez, E. Mogilevskiy, P. Naubereit, J. Piot, Sebastian Rothe, H Savajols, Simon Sels, Volker Sonnenschein, E. Traykov, Celine Van Beveren, Paul Van den Bergh, Piet Van Duppen, Klaus Wendt, Alexandra Zadvornaya

    Research outputpeer-review


    To study exotic nuclides at the borders of stability with laser ionization and spectroscopy techniques, highest efficiencies in combination with a high spectral resolution are required. These usually opposing requirements are reconciled by applying the in-gas-laser ionization and spectroscopy (IGLIS) technique in the supersonic gas jet produced by a de Laval nozzle installed at the exit of the stopping gas cell. Carrying out laser ionization in the low-temperature and low density supersonic gas jet eliminates pressure broadening, which will significantly improve the spectral resolution. This article presents the required modifications at the Leuven Isotope Separator On-Line (LISOL) facility that are needed for the first on-line studies of in-gas-jet laser spectroscopy. Different geometries for the gas outlet and extraction ion guides have been tested for their performance regarding the acceptance of laser ionized species as well as for their differential pumping capacities. The specifications and performance of the temporarily installed high repetition rate laser system, including a narrow bandwidth injection-locked Ti:sapphire laser, are discussed and first preliminary results on neutron-deficient actinium isotopes are presented indicating the high capability of this novel technique.
    Original languageEnglish
    Pages (from-to)382-387
    Number of pages6
    JournalNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
    StatePublished - 4 Feb 2016

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