- Mitchell, AJ
- Lister, CJ
- McCutchan, EA
- Albers, M
- Ayangeakaa, AD
- Bertone, PF
- Carpenter, MP
- Chiara, CJ
- Chowdhury, P
- Clark, JA
- Copp, P
- David, HM
- Deo, AY
- DiGiovine, B
- D'Olympia, N
- Dungan, R
- Harding, RD
- Harker, J
- Hota, SS
- Janssens, RVF
- Kondev, FG
- Liu, SH
- Ramayya, AV
- Rissanen, J
- Savard, G
- Seweryniak, D
- Shearman, R
- Sonzogni, AA
- Tabor, SL
- Walters, WB
- Wang, E
- Zhu, S
- et al.
© 2016 American Physical Society. Low-spin states in the neutron-rich, N=90 nuclide Ba146 were populated following β decay of Cs146, with the goal of clarifying the development of deformation in barium isotopes through delineation of their nonyrast structures. Fission fragments of Cs146 were extracted from a 1.7-Ci Cf252 source and mass selected using the CAlifornium Rare Ion Breeder Upgrade (CARIBU) facility. Low-energy ions were deposited at the center of a box of thin β detectors, surrounded by a highly efficient high-purity Ge array. The new Ba146 decay scheme now contains 31 excited levels extending up to ∼2.5 MeV excitation energy, double what was previously known. These data are compared to predictions from the interacting boson approximation (IBA) model. It appears that the abrupt shape change found at N=90 in Sm and Gd is much more gradual in Ba and Ce, due to an enhanced role of the γ degree of freedom.