The spectroscopic quadrupole moment of the 21+ state of 12C : A benchmark of theoretical models
Saiz-Lomas, J., Petri, M., Lee, I. Y., Syndikus, I., Heil, S., Allmond, J. M., Gaffney, L. P., Pakarinen, J., Badran, H., Calverley, T., Cox, D. M., Forsberg, U., Grahn, T., Greenlees, P., Hadyńska-Klȩk, K., Hilton, J., Jenkinson, M., Julin, R., Konki, J., . . . Wadsworth, R. (2023). The spectroscopic quadrupole moment of the 21+ state of 12C : A benchmark of theoretical models. Physics Letters B, 845, Article 138114. https://doi.org/10.1016/j.physletb.2023.138114
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Physics Letters BDate
2023Discipline
Ydin- ja kiihdytinfysiikan huippuyksikköFysiikkaKiihdytinlaboratorioCentre of Excellence in Nuclear and Accelerator Based PhysicsPhysicsAccelerator LaboratoryCopyright
© 2023 the Authors
The spectroscopic quadrupole moment of the first 2+ state of 12C has been measured employing the Coulomb-excitation re-orientation technique. Our result of Qs (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 Qs(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.
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The authors acknowledge C. Bertulani, A. Vitturi, A. Moro, M. Gomez, J. M. Quesada, M. Zielinska, and C. Barton for enlightening discussions, and I. Moore for proposing and supporting the production of the 66Ga source. This work was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Projektnummer 279384907 – SFB 1245, the Royal Society under contract number UF150 ...
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