Physics Letters B (Oct 2023)
The spectroscopic quadrupole moment of the 21+ state of 12C: A benchmark of theoretical models
- J. Saiz-Lomas,
- M. Petri,
- I.Y. Lee,
- I. Syndikus,
- S. Heil,
- J.M. Allmond,
- L.P. Gaffney,
- J. Pakarinen,
- H. Badran,
- T. Calverley,
- D.M. Cox,
- U. Forsberg,
- T. Grahn,
- P. Greenlees,
- K. Hadyńska-Klȩk,
- J. Hilton,
- M. Jenkinson,
- R. Julin,
- J. Konki,
- A.O. Macchiavelli,
- M. Mathy,
- J. Ojala,
- P. Papadakis,
- J. Partanen,
- P. Rahkila,
- P. Ruotsalainen,
- M. Sandzelius,
- J. Sarén,
- S. Stolze,
- J. Uusitalo,
- R. Wadsworth
Affiliations
- J. Saiz-Lomas
- School of Physics, Engineering and Technology, University of York, York, United Kingdom
- M. Petri
- School of Physics, Engineering and Technology, University of York, York, United Kingdom; Corresponding author.
- I.Y. Lee
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
- I. Syndikus
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
- S. Heil
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
- J.M. Allmond
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
- L.P. Gaffney
- Department of Physics, University of Liverpool, Liverpool, UK
- J. Pakarinen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- H. Badran
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- T. Calverley
- Department of Physics, University of Liverpool, Liverpool, UK; Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- D.M. Cox
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- U. Forsberg
- School of Physics, Engineering and Technology, University of York, York, United Kingdom; Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- T. Grahn
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- P. Greenlees
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- K. Hadyńska-Klȩk
- Department of Physics, University of Surrey, Guildford, United Kingdom
- J. Hilton
- Department of Physics, University of Liverpool, Liverpool, UK; Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- M. Jenkinson
- School of Physics, Engineering and Technology, University of York, York, United Kingdom
- R. Julin
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- J. Konki
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- A.O. Macchiavelli
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
- M. Mathy
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
- J. Ojala
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- P. Papadakis
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- J. Partanen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- P. Rahkila
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- P. Ruotsalainen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- M. Sandzelius
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- J. Sarén
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- S. Stolze
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- J. Uusitalo
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
- R. Wadsworth
- School of Physics, Engineering and Technology, University of York, York, United Kingdom
- Journal volume & issue
-
Vol. 845
p. 138114
Abstract
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(21+)=+9.3−3.8+3.5efm2 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(21+)=+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.
