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Nuclear Experiment

arXiv:1512.06453 (nucl-ex)
[Submitted on 20 Dec 2015]

Title:$γ$-soft $^{146}$Ba and the role of non-axial shapes at N ~ 90

Authors:A. J. Mitchell, C. J. Lister, E. A. McCutchan, M. Albers, A. D. Ayangeakaa, P. F. Bertone, M. P. Carpenter, C. J. Chiara, P. Chowdhury, J. A. Clark, P. Copp, H. M. David, A. Y. Deo, B. DiGiovine, N. D'Olympia, R. Dungan, R. D. Harding, J. Harker, S. S. Hota, R. V. F. Janssens, F. G. Kondev, S. H. Liu, A. V. Ramayya, J. Rissanen, G. Savard, D. Seweryniak, R. Shearman, A. A. Sonzogni, S. L. Tabor, W. B. Walters, E. Wang, S. Zhu
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Abstract:Low-spin states in the neutron-rich, N = 90 nuclide $^{146}$Ba were populated following $\beta$-decay of $^{146}$Cs, with the goal of clarifying the development of deformation in Ba isotopes through delineation of their non-yrast structures. Fission fragments of $^{146}$Cs were extracted from a 1.7-Ci $^{252}$Cf source and mass-selected using the CARIBU facility. Low-energy ions were deposited at the center of a box of thin $\beta$ detectors, surrounded by a high-efficiency HPGe array. The new $^{146}$Ba 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 $\gamma$ degree of freedom.
Comments: 10 pages, 8 figures, accepted to Physical Review C
Subjects: Nuclear Experiment (nucl-ex)
Cite as: arXiv:1512.06453 [nucl-ex]
  (or arXiv:1512.06453v1 [nucl-ex] for this version)
  https://doi.org/10.48550/arXiv.1512.06453
Related DOI: https://doi.org/10.1103/PhysRevC.93.014306

Submission history

From: Alan John Mitchell [view email]
[v1] Sun, 20 Dec 2015 23:13:10 UTC (322 KB)
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