%0 Journal Article
%T Evolution of deformation in neutron-rich Ba isotopes up to A=150
%A IDS Collaboration (Lica, R. et al
%A Morales, A. I.
%J Physical Review C
%D 2018
%V 97
%N 2
%I Amer Physical Soc
%@ 2469-9985
%G English
%F IDSCollaborationLica+Morales2018
%O WOS:000424089400005
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3471), last updated on Sun, 18 Feb 2018 17:31:44 +0000
%X The occurrence of octupolar shapes in the Ba isotopic chain was recently established experimentally up to N = 90. To further extend the systematics, the evolution of shapes in the most neutron-rich members of the Z = 56 isotopic chain accessible at present, Ba-148,Ba-150, has been studied via beta decay at the ISOLDE Decay Station. This paper reports on the first measurement of the positive-and negative-parity low-spin excited states of 150Ba and presents an extension of the beta-decay scheme of Cs-148. Employing the fast timing technique, half-lives for the 2(1)(+) level in both nuclei have been determined, resulting in T-1/2 = 1.51(1) ns for Ba-148 and T-1/2 = 3.4(2) ns for Ba-150. The systematics of low-spin states, together with the experimental determination of the B(E2 : 2(+) -> 0(+)) transition probabilities, indicate an increasing collectivity in Ba148-150, towards prolate deformed shapes. The experimental data are compared to symmetry conserving configuration mixing (SCCM) calculations, confirming an evolution of increasingly quadrupole deformed shapes with a definite octupolar character.
%R 10.1103/PhysRevC.97.024305
%U https://doi.org/10.1103/PhysRevC.97.024305
%P 024305-12pp