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Spectroscopic quadrupole moments in124$$\mathrm{Xe}$$

Journal Article · · Physical Review. C
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  1. GANIL, CEA/DRF-CNRS/IN2P3, Caen (France)
  2. GANIL, CEA/DRF-CNRS/IN2P3, Caen (France); Institut Laue-Langevin, Grenoble (France)
  3. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  4. Polish Academy of Sciences (PAS), Krakow (Poland)
  5. Istituto Nazionale di Fisica Nucleare, Milano (Italy)
  6. University of Liverpool (United Kingdom)
  7. Istituto Nazionale di Fisica Nucleare, Milano (Italy); University of Milan (Italy)
  8. KTH Royal Institute of Technology, Stockholm (Sweden)
  9. University of Valencia (Spain); Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy)
  10. University of Milan (Italy); Istituto Nazionale di Fisica Nucleare, Milano (Italy)
  11. Consejo Superior de Investigaciones Cientificas (CSIC), Valencia (Spain)
  12. University of Lyon (France)
  13. University of Koln (Germany)
  14. University of Valencia (Spain)
  15. Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy)
  16. Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain)
  17. Ankara University (Turkey)
  18. University Paris-Saclay, Gif-sur-Yvette (France)
  19. Istituto Nazionale di Fisica Nucleare, Padova (Italy); University degli Studi di Padova (Italy)
  20. Université Paris-Saclay, Orsay (France)
  21. Istituto Nazionale di Fisica Nucleare, Padova (Italy)
  22. Uppsala University (Sweden)
  23. University of Surrey, Guildford (United Kingdom)
  24. University of Salamanca (Spain)
  25. Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy); University Paris-Saclay, Gif-sur-Yvette (France); Argonne National Laboratory (ANL), Argonne, IL (United States)
  26. Institute for Nuclear Research, Debrecen (Hungary)
+ Show Author Affiliations
The Xe isotopic chain with four valence protons above the Z=50 shell closure is an ideal laboratory for the study of the evolution of nuclear deformation. At the N=82 shell closure, 136Xe presents all characteristics of a doubly closed shell nucleus with a spherical shape. In the very neutron-deficient isotopes close to N=50, the α-decay chain of Xe was investigated to probe the radioactive decay properties near the drip-line and the magicity of 100Sn. Additionally, the Xe isotopes present higher order symmetries in the nuclear deformation such as the octupole degree of freedom near N=60 and N=90 or O(6) symmetry in stable isotopes. The relevance of the O(6) symmetry has been investigated by measuring the spectroscopic quadrupole moment of the first excited states in 124Xe. In the O(6) symmetry limit, the spectroscopic quadrupole moment of collective states is expected to be null. A stable 124Xe beam with energies of 4.03A MeV and 4.11 A MeV was used to bombard a natW target at the GANIL facility. Excited states were populated via the safe Coulomb excitation reaction. The collision of the heavy ions with a large Z at low energy make this reaction sensitive to the diagonal E2 matrix element of the excited states. The recoils were detected in the VAMOS++ magnetic spectrometer and the γ rays in the AGATA tracking array. The least squares fitting code gosia was used for the analysis to extract both E2 and M1 transitional and E2 diagonal matrix elements. The rotational ground state band was populated up to the 8$$^{+}_{1}$$ state as well as the 2$$^{+}_{2}$$ and 4$$^{+}_{2}$$ states. Using high precision spectroscopic data to constrain the gosia fit, the spectroscopic quadrupole moments of the 2$$^{+}_{1}$$, 4$$^{+}_{1}$$, and 6$$^{+}_{1}$$ states were determined for the first time. The spectroscopic quadrupole moments were found to be negative, large, and constant in the ground state band underlining the prolate axially deformed ground state band of 124Xe. Here, the present experimental data confirm that the O(6) symmetry is substantially broken in 124Xe .
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); Agence Nationale de la recherche (ANR); Science and Technologies Facilities Council (STFC-UK); European Regional Development Fund (ERDF); Spanish Ministry of Science and Innovation (MICINN)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1923063
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 107; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (12)

FIG. 1(p. 3)figure FIG. 1
FIG. 2(p. 3)figure FIG. 2
FIG. 3(p. 3)figure FIG. 3
FIG. 4(p. 4)figure FIG. 4
TABLE I(p. 4)table TABLE I
TABLE II(p. 4)table TABLE II
FIG. 5(p. 5)figure FIG. 5
TABLE III(p. 5)table TABLE III
TABLE IV(p. 5)table TABLE IV
FIG. 6(p. 6)figure FIG. 6
FIG. 7(p. 6)figure FIG. 7
FIG. 8(p. 7)figure FIG. 8

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
collective levels
electromagnetic moments
electromagnetic transitions
spectroscopic factors