Collectivity in PB-196, Pb-198 isotopes probed in Coulomb-excitation experiments at REX-ISOLDE

Janne Pakarinen, Tuomas Grahn, Liam Paul Gaffney, Alejandro Algora, Christopher Bauer, Andrey Blazhev, Nick Bree, Thomas Elias Cocolios, Hilde De Witte, Jan Diriken, P. Fernier, K Hadynska-Klek, A Herzan, Mark Huyse, Jendrek Iwanicki, U. Jakobsson, D Jenkins, Nele Kesteloot, Joonas Konki, B. LannooP. Papadakis, PJ Peura, P Rahkila, G. Rainovski, Elisa Rapisarda, Peter Reiter, Sara Sambi, Marcus Scheck , B. Seibeck, Michael Seidlitz, Thierry Stora, Piet Van Duppen, Nigel Warr, Fredrik Wenander, MJ Vermeulen, Didier Voulot, Kasia Wrzosek-Lipska, Magda Zielinska

    Research outputpeer-review


    The neutron-deficient Pb-196,Pb-198 isotopes have been studied in Coulomb-excitation experiments employing the Miniball gamma-ray spectrometer and radioactive ion beams from the REX-ISOLDE post-accelerator at CERN. The reduced transition probabilities of the first excited 2(+) states in Pb-196 and Pb-198 nuclei have been measured for the first time. Values of B (E2) = 18.2(-4.1)(+4.8) W. u. and B (E2) = 13.1(-3.5)(+4.9) W. u., were obtained, respectively. The experiment sheds light on the development of collectivity when moving from the regime governed by the generalised seniority scheme to a region, where intruding structures, associated with different deformed shapes, start to come down in energy and approach the spherical ground state.
    Original languageEnglish
    Article number064009
    Number of pages10
    JournalJournal of Physics G: Nuclear and Particle Physics
    StatePublished - 3 May 2017

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