In-source laser spectroscopy with the Laser Ion Source and Trap: first direct study of the ground-state properties of 217,219Po

D A Fink, Thomas Elias Cocolios, A Gottberg, M Huyse, N Imai, T Kron, N Lecesne, Kara Marie Lynch, B A Marsh, D Pauwels, E Rapisarda, S D Richter, A N Andreyev, R E Rossel, S Rothe, M D Seliverstov, A M Sjödin, C Van Beveren, P Van Duppen, K D A WendtS Antalic, A E Barzakh, B Bastin, D V Fedorov, V N Fedosseev, Kieran Thomas Flanagan, L Ghys

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A Laser Ion Source and Trap (LIST) for a thick-target, isotope-separation on-line facility has been implemented at CERN ISOLDE for the production of pure, laser-ionized, radioactive ion beams. It offers two modes of operation, either as an ion guide, which performs similarly to the standard ISOLDE resonance ionization laser ion source (RILIS), or as a more selective ion source, where surface-ionized ions from the hot ion-source cavity are repelled by an electrode, while laser ionization is done within a radiofrequency quadrupole ion guide. The first physics application of the LIST enables the suppression of francium contamination in ion beams of neutron-rich polonium isotopes at ISOLDE by more than 1000 with a reduction in laser-ionization efficiency of only 20. Resonance ionization spectroscopy is performed directly inside the LIST device, allowing the study of the hyperfine structure and isotope shift of 217Po for the first time. Nuclear decay spectroscopy of 219Po is performed for the first time, revealing its half-life, α- to-β-decay branching ratio, and α-particle energy. This experiment demonstrates the applicability of the LIST at radioactive ion-beam facilities for the production and study of pure beams of exotic isotopes.
    Original languageEnglish
    Article number011018
    JournalPhysical Review X
    Volume5
    Issue number1
    DOIs
    Publication statusPublished - 20 Feb 2015

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