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Direct evidence of octupole deformation in neutron-rich 144Ba

Journal Article · · Physical Review Letters
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Univ. of Rochester, Rochester, NY (United States)
  4. Univ. of Liverpool, Liverpool (United Kingdom)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States)
  7. Ohio Univ., Athens, OH (United States)
  8. Univ. of West of Scotland, Paisley (United Kingdom); Scottish Univ. Physics Alliance, Glasgow (United Kingdom)
  9. Argonne National Lab. (ANL), Argonne, IL (United States); IN2P3-CNRS, Orsay Campus (France)
  10. Florida State Univ., Tallahassee, FL (United States)
  11. Univ. of the West of Scotland, Paisley (United Kingdom); Scottish Univ., Physics Alliance, Glasgow (United Kingdom)
  12. Univ. of Notre Dame, Notre Dame, IN (United States)
+ Show Author Affiliations
Here, the neutron-rich nucleus 144Ba (t1/2 = 11.5 s) is expected to exhibit some of the strongest octupole correlations among nuclei with mass numbers A less than 200. Until now, indirect evidence for such strong correlations has been inferred from observations such as enhanced E1 transitions and interleaving positive- and negative-parity levels in the ground-state band. In this experiment, the octupole strength was measured directly by sub-barrier, multistep Coulomb excitation of a post-accelerated 650-MeV 144Ba beam on a 1.0–mg/cm2 208Pb target. The measured value of the matrix element, < 31–∥M(E3)∥01+ >= 0.65(+17–23) eb3/2, corresponds to a reduced B(E3) transition probability of 48(+25–34) W.u. This result represents an unambiguous determination of the octupole collectivity, is larger than any available theoretical prediction, and is consistent with octupole deformation.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1260475
Alternate ID(s):
OSTI ID: 1242331
OSTI ID: 1379235
OSTI ID: 1392459
Report Number(s):
LLNL-JRNL--676868
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 116; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (20)

Impact of pear-shaped fission fragments on mass-asymmetric fission in actinides journal December 2018
Multidimensionally constrained covariant density functional theories—nuclear shapes and potential energy surfaces journal May 2016
Octupole collectivity in nuclei journal June 2016
Mean field and beyond description of nuclear structure with the Gogny force: a review journal December 2018
Analytical description of shape transition in nuclear alternating parity bands journal November 2018
Effect of shell structure on the fission of sub-lead nuclei journal October 2019
Microscopic core-quasiparticle coupling model for spectroscopy of odd-mass nuclei with octupole correlations journal October 2019
Search for octupole-deformed actinium isotopes using resonance ionization spectroscopy journal October 2019
Octupole correlations in the Ba 144 nucleus described with symmetry-conserving configuration-mixing calculations journal June 2016
Parity-doublet structure in the La 90 57 147 nucleus journal December 2017
Signatures of octupole correlations in neutron-rich odd-mass barium isotopes journal February 2018
Odd-even parity splittings and octupole correlations in neutron-rich Ba isotopes journal February 2018
High-resolution ( p , t ) study of low-spin states in Pu 240 : Octupole excitations, α clustering, and other structure features journal June 2018
Direct Evidence for Octupole Deformation in Ba 146 and the Origin of Large E 1 Moment Variations in Reflection-Asymmetric Nuclei journal April 2017
Coexistence of Reflection Asymmetric and Symmetric Shapes in Ba 144 journal January 2020
Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive Ra 222 and Ra 228 Beams journal January 2020
Two questions about a non-flat nuclear space-time journal February 2018
Signatures of octupole correlations in neutron-rich odd-mass barium isotopes text January 2017
Mean field and beyond description of nuclear structure with the Gogny force: A review text January 2018
Microscopic core-quasiparticle coupling model for spectroscopy of odd-mass nuclei with octupole correlations text January 2019

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