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, P. Fernier, K. Hadyńska-Klk, A. Herzáň, M. Huyse, J. Iwanicki, U. Jakobsson, D. Jenkins, N. Kesteloot, J. Konki, B. LannooP. Papadakis, P. Peura, P. Rahkila, G. Rainovski, E. Rapisarda, P. Reiter, S. Sambi, M. Scheck, B. Seibeck, M. Seidlitz, T. Stora, P. Van Duppen, N. Warr, F. Wenander, M. J. Vermeulen, D. Voulot, K. Wrzosek-Lipska, M. Zielińska

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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 +4.9W.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
Issue number6
Publication statusPublished - 3 May 2017

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  • Coulomb excitation
  • gamma-ray spectroscopy
  • radioactive ion beams
  • γ transitions and level energies

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