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

The neutron-deficient ^{\mathrm{196,198}}$Pb 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...

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Veröffentlicht in:Journal of Physics G, Nuclear and Particle Physics Nuclear and Particle Physics, 2017-05, Vol.44 (6)
Hauptverfasser: Pakarinen, J, Grahn, T, Gaffney, Liam, Algora, A, Bauer, C, Blazhev, A, Bree, Nick, Cocolios, Thomas Elias, De Witte, Hilde, Diriken, Jan, Fernier, P, Hadyńska-Klȩk, K, Herzáň, A, Huyse, Mark, Iwanicki, J, Jakobsson, U, Jenkins, D, Kesteloot, Nele, Konki, J, Lannoo, Bruno, Papadakis, P, Peura, P, Rahkila, P, Rainovski, G, Rapisarda, Elisa, Reiter, P, Sambi, Sara, Scheck, M, Seibeck, B, Seidlitz, M, Stora, T, Van Duppen, Piet, Warr, N, Wenander, F, Vermeulen, M.J, Voulot, D, Wrzosek-Lipska, Kasia, Zielińska, M
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Sprache:eng
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Zusammenfassung:The neutron-deficient ^{\mathrm{196,198}}$Pb 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.
ISSN:0954-3899