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

Title: $γ$ -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.

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

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

Grant/Contract Number:: AC02-05CH11231; FG02-94ER40848; FG02-94ER40834; AC02-06CH1135; 1064819; AC02-06CH11357

OSTI ID:: 1430665

Alternate ID(s):: OSTI ID: 1234769

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

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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References (46)

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
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
Search for intrinsic collective excitations in ${}^{152}{Sm}$ 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
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 = 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
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
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
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
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
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
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
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
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
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
Decay of 2.22-sec ${}_{^{1}_{56}^{46}}{Ba}_{90}$ to levels of odd-odd ${}_{^{1}_{57}^{46}}{La}_{89}$ 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
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
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
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
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
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
New Features of Shape Coexistence in ${}^{152}{Sm}$ 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
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
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
$B (E 2)$ Values in ${}^{150}N d$ 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
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
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
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
Transition probabilities in ${}^{154}{Gd}$ : 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
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
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
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
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
Ground-State Bands in Neutron-Rich Even Te, Xe, Ba, Ce, Nd, and Sm Isotopes Produced in the Fission of ${}^{252}{Cf}$ 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 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
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
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
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
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
Shape phase transition at $N = 88 – 90$ in ${}^{144, 146}{Ba}$ Gupta, J. B.; Saxena, Mansi Physical Review C, Vol. 91, Issue 5 https://doi.org/10.1103/PhysRevC.91.054312	journal	May 2015
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
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
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
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
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
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

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