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

Journal of Physics G: Nuclear and Particle Physics

44
064009
(2017)
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-Klȩk, A Herzán, M Huyse, J Iwanicki, U Jakobsson, D Jenkins, N Kesteloot, J Konki, B Lannoo, P 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 and M Zielińska

The neutron-deficient 
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
(
𝐸
2
)
=
18.2
−
4.1
+
4.8
 W.u. and 
𝐵
(
𝐸
2
)
=
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.

DOI
10.1088/1361-6471/aa6753
Published on
nwarr