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 · Fri Jan 01 04:00:00 EST 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.93.014306· OSTI ID:1248951

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. more »

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.

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

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

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1248951

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

Publisher:: APS

Country of Publication:: United States

Language:: English

References (46)

Shape phase transition at N = 88 – 90 in Ba 144 , 146 Gupta, J. B.; Saxena, Mansi Physical Review C, Vol. 91, Issue 5 https://doi.org/10.1103/PhysRevC.91.054312	journal	May 2015
Intrinsic reflection asymmetry in atomic nuclei Butler, P. A.; Nazarewicz, W. Reviews of Modern Physics, Vol. 68, Issue 2 https://doi.org/10.1103/RevModPhys.68.349	journal	April 1996
Nuclear Data Sheets for A = 154 Reich, C. W. Nuclear Data Sheets, Vol. 110, Issue 10 https://doi.org/10.1016/j.nds.2009.09.001	journal	October 2009
New Features of Shape Coexistence in Sm 152 Garrett, P. E.; Kulp, W. D.; Wood, J. L. Physical Review Letters, Vol. 103, Issue 6 https://doi.org/10.1103/PhysRevLett.103.062501	journal	August 2009
Mapping the interacting boson approximation symmetry triangle: New trajectories of structural evolution of rare-earth nuclei McCutchan, E. A.; Zamfir, N. V.; Casten, R. F. Physical Review C, Vol. 69, Issue 6 https://doi.org/10.1103/PhysRevC.69.064306	journal	June 2004
Evaluation of theoretical conversion coefficients using BrIcc Kibédi, T.; Burrows, T. W.; Trzhaskovskaya, M. B. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 589, Issue 2 https://doi.org/10.1016/j.nima.2008.02.051	journal	May 2008
Octupole deformation in neutron-rich barium isotopes Phillips, W. R.; Ahmad, I.; Emling, H. Physical Review Letters, Vol. 57, Issue 26 https://doi.org/10.1103/PhysRevLett.57.3257	journal	December 1986
Collective Nuclear States as Representations of a SU(6) Group Arima, A.; Iachello, F. Physical Review Letters, Vol. 35, Issue 16 https://doi.org/10.1103/PhysRevLett.35.1069	journal	October 1975
Nuclear Data Sheets for A=158 Helmer, R. G. Nuclear Data Sheets, Vol. 101, Issue 3 https://doi.org/10.1016/j.nds.2004.02.001	journal	March 2004
IBA consistent-Q formalism extended to the vibrational region Lipas, P. O.; Toivonen, P.; Warner, D. D. Physics Letters B, Vol. 155, Issue 5-6 https://doi.org/10.1016/0370-2693(85)91573-4	journal	June 1985
Transition probabilities in Gd 154 : Evidence for X(5) critical point symmetry Tonev, D.; Dewald, A.; Klug, T. Physical Review C, Vol. 69, Issue 3 https://doi.org/10.1103/PhysRevC.69.034334	journal	March 2004
LevelScheme: A level scheme drawing and scientific figure preparation system for Mathematica Caprio, M. A. Computer Physics Communications, Vol. 171, Issue 2 https://doi.org/10.1016/j.cpc.2005.04.010	journal	September 2005
A study of collective octupole states in barium in the interacting boson model Kusnezov, D.; Iachello, F. Physics Letters B, Vol. 209, Issue 4 https://doi.org/10.1016/0370-2693(88)91166-5	journal	August 1988
Search for intrinsic collective excitations in Sm 152 Kulp, W. D.; Wood, J. L.; Garrett, P. E. Physical Review C, Vol. 77, Issue 6 https://doi.org/10.1103/PhysRevC.77.061301	journal	June 2008
Chaotic properties of the interacting-boson model: A discovery of a new regular region Alhassid, Y.; Whelan, N. Physical Review Letters, Vol. 67, Issue 7 https://doi.org/10.1103/PhysRevLett.67.816	journal	August 1991
Nuclear Data Sheets for A = 148 Nica, N. Nuclear Data Sheets, Vol. 117 https://doi.org/10.1016/j.nds.2014.02.001	journal	March 2014
The neutron-rich barium isotopes Scott, S. M.; Hamilton, W. D.; Hungerford, P. Journal of Physics G: Nuclear Physics, Vol. 6, Issue 10 https://doi.org/10.1088/0305-4616/6/10/016	journal	October 1980
Shape phase transitions and critical-point phenomena in atomic nuclei Casten, R. F. Nature Physics, Vol. 2, Issue 12 https://doi.org/10.1038/nphys451	journal	December 2006
SU(3) Quasidynamical Symmetry Underlying the Alhassid-Whelan Arc of Regularity Bonatsos, Dennis; McCutchan, E. A.; Casten, R. F. Physical Review Letters, Vol. 104, Issue 2 https://doi.org/10.1103/PhysRevLett.104.022502	journal	January 2010
Nuclear Data Sheets for A = 146 Peker, L. K.; Tuli, J. K. Nuclear Data Sheets, Vol. 82, Issue 2 https://doi.org/10.1006/ndsh.1997.0020	journal	October 1997
The evolution of nuclear structure: the scheme and related correlations Casten, R. F.; Zamfir, N. V. Journal of Physics G: Nuclear and Particle Physics, Vol. 22, Issue 11 https://doi.org/10.1088/0954-3899/22/11/002	journal	November 1996
The X-Array and SATURN: A new decay-spectroscopy station for CARIBU Mitchell, A. J.; Bertone, P. F.; DiGiovine, B. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 763 https://doi.org/10.1016/j.nima.2014.06.024	journal	November 2014
Analytic Description of Critical Point Nuclei in a Spherical-Axially Deformed Shape Phase Transition Iachello, F. Physical Review Letters, Vol. 87, Issue 5 https://doi.org/10.1103/PhysRevLett.87.052502	journal	July 2001
B ( E 2 ) Values in N 150 d and the Critical Point Symmetry X(5) Krücken, R.; Albanna, B.; Bialik, C. Physical Review Letters, Vol. 88, Issue 23 https://doi.org/10.1103/PhysRevLett.88.232501	journal	May 2002
Radioactive beams from gas catchers: The CARIBU facility Savard, G.; Baker, S.; Davids, C. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 266, Issue 19-20 https://doi.org/10.1016/j.nimb.2008.05.091	journal	October 2008
Nuclear Data Sheets for A = 156 Reich, C. W. Nuclear Data Sheets, Vol. 113, Issue 11 https://doi.org/10.1016/j.nds.2012.10.003	journal	November 2012
Test of two-level crossing at the N = 90 spherical-deformed critical point Zamfir, N. V.; von Brentano, P.; Casten, R. F. Physical Review C, Vol. 66, Issue 2 https://doi.org/10.1103/PhysRevC.66.021304	journal	August 2002
Nuclear Data Sheets for Basu, S. K.; Sonzogni, A. A. Nuclear Data Sheets, Vol. 114, Issue 4-5 https://doi.org/10.1016/j.nds.2013.04.001	journal	April 2013
Isotope shifts, spins and hyperfine structures of 118,146Cs and of some francium isotopes Coc, A.; Thibault, C.; Touchard, F. Nuclear Physics A, Vol. 468, Issue 1 https://doi.org/10.1016/0375-9474(87)90314-9	journal	June 1987
Singular character of critical points in nuclei Werner, V.; von Brentano, P.; Casten, R. F. Physics Letters B, Vol. 527, Issue 1-2 https://doi.org/10.1016/S0370-2693(02)01160-7	journal	February 2002
Empirical Realization of a Critical Point Description in Atomic Nuclei Casten, R. F.; Zamfir, N. V. Physical Review Letters, Vol. 87, Issue 5 https://doi.org/10.1103/PhysRevLett.87.052503	journal	July 2001
Influence of shell effects and stable octupole deformation on the E 1 and E 2 transition rates in the heavy-Ba region Mach, H.; Nazarewicz, W.; Kusnezov, D. Physical Review C, Vol. 41, Issue 6 https://doi.org/10.1103/PhysRevC.41.R2469	journal	June 1990
Experimental Confirmation of the Alhassid-Whelan Arc of Regularity Jolie, J.; Casten, R. F.; Cejnar, P. Physical Review Letters, Vol. 93, Issue 13 https://doi.org/10.1103/PhysRevLett.93.132501	journal	September 2004
Microscopic Description of Nuclear Quantum Phase Transitions Nikšić, T.; Vretenar, D.; Lalazissis, G. A. Physical Review Letters, Vol. 99, Issue 9 https://doi.org/10.1103/PhysRevLett.99.092502	journal	August 2007
Dynamic Symmetries at the Critical Point Iachello, F. Physical Review Letters, Vol. 85, Issue 17 https://doi.org/10.1103/PhysRevLett.85.3580	journal	October 2000
The IBA in deformed nuclei Casten, R. F.; Warner, D. D. Progress in Particle and Nuclear Physics, Vol. 9 https://doi.org/10.1016/0146-6410(83)90021-2	journal	January 1983
Nuclear Data Sheets for A = 152 Martin, M. J. Nuclear Data Sheets, Vol. 114, Issue 11 https://doi.org/10.1016/j.nds.2013.11.001	journal	November 2013
The onset of deformation in the neutron-rich Ba isotopes Scott, S. M.; Hamilton, W. D.; Hungerford, P. Journal of Physics G: Nuclear Physics, Vol. 5, Issue 10 https://doi.org/10.1088/0305-4616/5/10/008	journal	October 1979
Ground-State Bands in Neutron-Rich Even Te, Xe, Ba, Ce, Nd, and Sm Isotopes Produced in the Fission of Cf 252 Wilhelmy, J. B.; Thompson, S. G.; Jared, R. C. Physical Review Letters, Vol. 25, Issue 16 https://doi.org/10.1103/PhysRevLett.25.1122	journal	October 1970
Octupole correlations in neutron-rich, even-even barium isotopes Urban, W.; Jones, M. A.; Durell, J. L. Nuclear Physics A, Vol. 613, Issue 1-2 https://doi.org/10.1016/S0375-9474(96)00393-4	journal	January 1997
Low-spin structure of 156 Dy through γ-ray spectroscopy Caprio, M. A.; Zamfir, N. V.; Casten, R. F. Physical Review C, Vol. 66, Issue 5 https://doi.org/10.1103/PhysRevC.66.054310	journal	November 2002
On Closed Shells in Nuclei Mayer, Maria G. Physical Review, Vol. 74, Issue 3 https://doi.org/10.1103/PhysRev.74.235	journal	August 1948
Congruent band structures in 154Gd : Configuration-dependent pairing, a double vacuum and lack of $ \beta$ -vibrations Sharpey-Schafer, J. F.; Mullins, S. M.; Bark, R. A. The European Physical Journal A, Vol. 47, Issue 1 https://doi.org/10.1140/epja/i2011-11005-8	journal	January 2011
Decay of 2.22-sec Ba 90 1 56 46 to levels of odd-odd La 89 1 57 46 Chung, C.; Walters, W. B.; Brenner, D. S. Physical Review C, Vol. 31, Issue 6 https://doi.org/10.1103/PhysRevC.31.2199	journal	June 1985
Collective Motion in the Nucleus Mottelson, Ben R. Reviews of Modern Physics, Vol. 29, Issue 2 https://doi.org/10.1103/RevModPhys.29.186	journal	April 1957
Mean-Field Derivation of the Interacting Boson Model Hamiltonian and Exotic Nuclei Nomura, Kosuke; Shimizu, Noritaka; Otsuka, Takaharu Physical Review Letters, Vol. 101, Issue 14 https://doi.org/10.1103/PhysRevLett.101.142501	journal	September 2008

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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