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Title: The spectroscopic quadrupole moment of the 2 1 + state of 12C: A benchmark of theoretical models

Journal Article · · Physics Letters. B
 [1]; ORCiD logo [1];  [2];  [3];  [3];  [4];  [5];  [6];  [6];  [7];  [6];  [8];  [6];  [6];  [9];  [7];  [1];  [6];  [6];  [10] more »;  [3];  [6];  [11];  [6];  [6];  [6];  [6];  [6];  [6];  [6];  [1] « less
  1. Univ. of York (United Kingdom)
  2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  3. Technische Univ. Darmstadt (Germany)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  5. Univ. of Liverpool (United Kingdom)
  6. Univ. of Jyvaskyla (Finland)
  7. Univ. of Liverpool (United Kingdom); Univ. of Jyvaskyla (Finland)
  8. Univ. of York (United Kingdom); Univ. of Jyvaskyla (Finland)
  9. Univ. of Surrey, Guildford (United Kingdom); Univ. of Warsaw (Poland)
  10. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  11. Univ. of Jyvaskyla (Finland); Science and Technology Facilities Council (STFC), Daresbury (United Kingdom). Daresbury Lab.
+ Show Author Affiliations

The spectroscopic quadrupole moment of the first 2+ state of 12C has been measured employing the Coulomb-excitation re-orientation technique. Our result of $$Q_{s} (2^{+}_{1}) = +9.3^{+3.5}_{-3.8}$$ efm2 suggests a larger oblate deformation than previously reported. Combining this with the consistently re-analyzed adopted value, we present the most precise value to date of $$Q_{s} (2^{+}_{1})$$ = +9.5(18) efm2, which is consistent with a geometrical rotor description. This simple outcome is compared to state-of-the-art shell-model, mean-field, ab initio calculations, cluster-based and geometrical-like theories, which show varying degrees of emergent quadrupole collectivity.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
German Research Foundation (DFG); Royal Society; Science and Technology Facilities Council, UK (STFC); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725
OSTI ID:
1997621
Journal Information:
Physics Letters. B, Journal Name: Physics Letters. B Journal Issue: 1 Vol. 845; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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