TY  - JOUR
AU  - IDS Collaboration (Lica, R. et al
AU  - Morales, A. I.
PY  - 2018
DA  - 2018//
TI  - Evolution of deformation in neutron-rich Ba isotopes up to A=150
T2  - Phys. Rev. C
JO  - Physical Review C
SP  - 024305
EP  - 12pp
VL  - 97
IS  - 2
PB  - Amer Physical Soc
AB  - 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.
SN  - 2469-9985
UR  - https://doi.org/10.1103/PhysRevC.97.024305
DO  - 10.1103/PhysRevC.97.024305
LA  - English
N1  - WOS:000424089400005
ID  - IDSCollaborationLica+Morales2018
ER  -