Charge radii of exotic neon and magnesium isotopes

S. J. Novario, G. Hagen, G. R. Jansen, T. Papenbrock

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62 Scopus citations

Abstract

We compute the charge radii and ground-state energies of even-mass neon and magnesium isotopes from neutron number N=8 to the dripline. Our calculations are based on nucleon-nucleon and three-nucleon potentials from chiral effective field theory that include Δ isobars. These potentials yield an accurate saturation point and symmetry energy of nuclear matter. We use the coupled-cluster method and start from an axially symmetric reference state. Binding energies and two-neutron separation energies largely agree with data, and the dripline in neon is accurate. The computed charge radii are accurate for many isotopes where data exist. Finer details, such as isotope shifts, however, are not accurately reproduced. These chiral potentials indicate a subshell closure at N=14 for the radii (but not for two-neutron separation energies) and a decrease in charge radii at N=8 (observed in neon and predicted for magnesium). They yield a continued increase of charge radii as neutrons are added beyond N=14 yet underestimate the large increase at N=20 in magnesium.

Original languageEnglish
Article number051303
JournalPhysical Review C
Volume102
Issue number5
DOIs
StatePublished - Nov 20 2020

Funding

Acknowledgments. We thank T. Duguet, Z. H. Sun, and A. Tichai for useful discussions. This work was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Awards No. DE-FG02-96ER40963 and No. DE-SC0018223. Computer time was provided by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) Program. This research used resources of the Oak Ridge Leadership Computing Facility located at Oak Ridge National Laboratory, which is supported by the Office of Science of the Department of Energy under Contract No. DE-AC05-00OR22725.

FundersFunder number
Office of Science of the Department of EnergyDE-AC05-00OR22725
U.S. Department of Energy
Office of Science
Nuclear PhysicsDE-FG02-96ER40963, DE-SC0018223
Oak Ridge National Laboratory

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