Collectivity in 196,198Pb isotopes probed in Coulomb-excitation experiments at REX-ISOLDE
Grahn, T., Pakarinen, J., Gaffney, L. P., Algora, A., Bauer, C., Blazhev, A., . . . Zielińska, M. (2017). Collectivity in 196,198Pb isotopes probed in Coulomb-excitation experiments at REX-ISOLDE. Journal of Physics G: Nuclear and Particle Physics, 44 (6), 064009. doi:10.1088/1361-6471/aa6753
Published inJournal of Physics G: Nuclear and Particle Physics
Bree, N. |
Warr, N. |
© 2017 IOP Publishing Ltd. This is a final draft version of an article whose final and definitive form has been published by IOP. Published in this repository with the kind permission of the publisher.
The neutron-deficient 196,198Pb isotopes have been studied in Coulombexcitation 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 +4.8 −4.1 W.u. and B(E2) = 13.1 +4.9 −3.5 W.u., were obtained, respectively. The experiment sheds light on the development of collectivity when moving from the regime governed by the generalized 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.