PT Journal
AU Pakarinen, Jea
   Algora, A
TI Collectivity in Pb-196, Pb-198 isotopes probed in Coulomb-excitation experiments at REX-ISOLDE
SO Journal of Physics G
JI J. Phys. G
PY 2017
BP 064009
EP 10pp
VL 44
IS 6
DI 10.1088/1361-6471/aa6753
LA English
DE Coulomb excitation; radioactive ion beams; gamma-ray spectroscopy; gamma transitions and level energies
AB The neutron-deficient Pb-196,Pb-198 isotopes have been studied in Coulomb-excitation experiments employing the Miniball gamma-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 Pb-196 and Pb-198 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.
ER