γ -soft Ba146 and the role of nonaxial shapes at N≈90

Mitchell, A. J.; Lister, C. J.; McCutchan, E. A.; Albers, M.; Ayangeakaa, A. D.; Bertone, P. F.; Carpenter, M. P.; Chiara, C. J.; Chowdhury, P.; Clark, J. A.; Copp, P.; David, H. M.; Deo, A. Y.; DiGiovine, B.; D'Olympia, N.; Dungan, R.; Harding, R. D.; Harker, J.; Hota, S. S.; Janssens, R. V.  F.; Kondev, F. G.; Liu, S. H.; Ramayya, A. V.; Rissanen, J.; Savard, G.; Seweryniak, D.; Shearman, R.; Sonzogni, A. A.; Tabor, S. L.; Walters, W. B.; Wang, E.; Zhu, S.

doi:10.1103/PhysRevC.93.014306

$γ$ -soft ${}^{146}{Ba}$ and the role of nonaxial shapes at $N \approx 90$

Journal Article · Tue Jan 12 00:00:00 EST 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.93.014306· OSTI ID:1430665

Mitchell, A. J. ^[1]; Lister, C. J. ^[1]; McCutchan, E. A. ^[2]; Albers, M. ^[3]; Ayangeakaa, A. D. ^[3]; Bertone, P. F. ^[3]; Carpenter, M. P. ^[3]; Chiara, C. J. ^[4]; Chowdhury, P. ^[1]; Clark, J. A. ^[3]; Copp, P. ^[1]; David, H. M. ^[3]; Deo, A. Y. ^[1]; DiGiovine, B. ^[3]; D'Olympia, N. ^[1]; Dungan, R. ^[5]; Harding, R. D. ^[6]; Harker, J. ^[7]; Hota, S. S. ^[1]; Janssens, R. V. F. ^[3] more »

Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics and Applied Physics
Brookhaven National Lab. (BNL), Upton, NY (United States). National Nuclear Data Center
Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; Univ. of Maryland, College Park, MD (United States). Dept. of Chemistry and Biochemistry
Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics and Applied Physics; Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics
Univ. of Maryland, College Park, MD (United States). Dept. of Chemistry and Biochemistry
Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division
Univ. of Kentucky, Lexington, KY (United States). Dept. of Chemistry; Univ. of Kentucky, Lexington, KY (United States). Dept. of Physics and Astronomy
Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Low-spin states in the neutron-rich, N = 90 nuclide ¹⁴⁶Ba were populated following β decay of ¹⁴⁶Cs , with the goal of clarifying the development of deformation in barium isotopes through delineation of their nonyrast structures. Fission fragments of ¹⁴⁶Cs were extracted from a 1.7-Ci ²⁵²Cf 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 ¹⁴⁶Ba 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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357; FG02-94ER40834; FG02-94ER40848

OSTI ID:: 1430665

Alternate ID(s):: OSTI ID: 1234769
OSTI ID: 1248951

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 1 Vol. 93; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Low- Z boundary of the N = 88 –90 shape phase transition: Ce 148 near the critical point Koseoglou, P.; Werner, V.; Pietralla, N. Physical Review C, Vol. 101, Issue 1 https://doi.org/10.1103/physrevc.101.014303	journal	January 2020
Direct Evidence for Octupole Deformation in Ba 146 and the Origin of Large E 1 Moment Variations in Reflection-Asymmetric Nuclei Bucher, B.; Zhu, S.; Wu, C. Y. Physical Review Letters, Vol. 118, Issue 15 https://doi.org/10.1103/physrevlett.118.152504	journal	April 2017

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