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

J. Pakarinen, T. Grahn, L. P. Gaffney, A. Algora, C. Bauer, A. Blazhev, N. Bree, T. E. Cocolios, H. De Witte, J. Diriken, Pascal Fernier, Kasia Hadinska-Klek, A. Herzáň, M. Huyse, Jendrek Iwanicki, U. Jakobsson, D. G. Jenkins, N. Kesteloot, J. Konki, B. LannooPhillipos Papadakis, P. Peura, G. Rainovski, E. Rapisarda, P. Reiter, S. Sambi, Marcus Scheck, Burkhard Seibeck, M. Seidlitz, T. Stora, P. Van Duppen, N. Warr, F. Wenander, M. J. Vermeulen, D. Voulot, K. Wrzosek-Lipska, M. Zielinska

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The neutron-deficient 196,198Pb isotopes have been studied in Coulomb-excitation experiments employing the Miniball γ-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 196Pb and 198Pb 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
JournalJournal of Physics G: Nuclear and Particle Physics
Publication statusPublished - 3 May 2017


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