Chiral three-nucleon forces and bound excited states in neutron-rich oxygen isotopes

Abstract

We study the spectra of neutron-rich oxygen isotopes based on chiral two- and three-nucleon interactions. First, we benchmark our many-body approach by comparing ground-state energies to coupled-cluster results for the same two-nucleon interaction, with overall good agreement. We then calculate bound excited states in 21,22,23O, focusing on the role of three-nucleon forces, in the standard sd shell and an extended sdf7/2p3/2 valence space. Chiral three-nucleon forces provide important one- and two-body contributions between valence neutrons. We find that both these contributions and an extended valence space are necessary to reproduce key signatures of novel shell evolution, such as the N = 14 magic number and the low-lying states in 21O and 23O, which are too compressed with two-nucleon interactions only. For the extended space calculations, this presents first work based on nuclear forces without adjustments. Future work is needed and open questions are discussed.

6 pages, 4 figures, published version

References in corpus (14)

• Improved nuclear matter calculations from chiral low-momentum interactions
• In-Medium Similarity Renormalization Group for Nuclei
• Continuum effects and three-nucleon forces in neutron-rich oxygen isotopes
• A new effective interaction for $0\hslash \omega$ shell model calculations in the sdpf valence space
• Coupled-cluster theory for three-body Hamiltonians
• In-Medium Similarity Renormalization Group for Open-Shell Nuclei
• New precision mass measurements of neutron-rich calcium and potassium isotopes and three-nucleon forces
• Low-momentum interactions with smooth cutoffs
• Solution of the center-of-mass problem in nuclear structure calculations
• Ab-initio shell model with a core
• Ab-initio computation of neutron-rich oxygen isotopes
• Ab initio coupled-cluster theory for open-shell nuclei
• Gamow shell-model calculations of drip-line oxygen isotopes
• Closed-shell properties of ${}^{24}$O with {\em ab initio} coupled-cluster theory

Cited by in corpus (41)

• Coupled-cluster computations of atomic nuclei
• The In-Medium Similarity Renormalization Group: A Novel Ab Initio Method for Nuclei
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• Neutron matter from chiral effective field theory interactions
• Nonperturbative shell-model interactions from the in-medium similarity renormalization group
• Nuclear forces and their impact on neutron-rich nuclei and neutron-rich matter
• Large-scale nuclear structure calculations for spin-dependent WIMP scattering with chiral effective field theory currents
• Radii and binding energies in oxygen isotopes: a puzzle for nuclear forces
• Ground and excited states of doubly open-shell nuclei from ab initio valence-space Hamiltonians
• Exploring sd-shell nuclei from two- and three-nucleon interactions with realistic saturation properties
• Nuclear chiral dynamics and thermodynamics
• Exotic neutron-rich medium-mass nuclei with realistic nuclear forces
• Beyond the Neutron Drip-Line: The Unbound Oxygen Isotopes 25O and 26O
• Three-nucleon forces and spectroscopy of neutron-rich calcium isotopes
• New applications of renormalization group methods in nuclear physics
• In-Medium Similarity Renormalization Group for Closed and Open-Shell Nuclei
• Non-observable nature of the nuclear shell structure. Meaning, illustrations and consequences
• Spectrum of shear modes in the neutron-star crust: Estimating the nuclear-physics uncertainties
• Two-proton emission and related phenomena
• Continuum effects in neutron-drip-line oxygen isotopes
• Effective double-beta-decay operator for 76Ge and 82Se
• The contribution of chiral three-body forces to the monopole component of the effective shell-model Hamiltonian
• An {\it ab-initio} Gamow shell model approach with a core
• Breakdown of the Isobaric Multiplet Mass Equation for the A = 20 and 21 Multiplets
• Role of three-nucleon forces and many-body processes in nuclear pairing
• Spherical coupled-cluster theory for open-shell nuclei
• Bogoliubov many-body perturbation theory under constraint
• Unbound spectra of neutron-rich oxygen isotopes predicted by the Gamow shell model
• Description of proton-rich nuclei in the $A\sim 20$ region with the Gamow shell model
• The nuclear energy density functional formalism
• Effective proton-neutron interaction near the drip line from unbound states in ${}^{25,26}$F
• Nuclear Structure from the In-Medium Similarity Renormalization Group
• The Tjon Band in Nuclear Lattice Effective Field Theory
• Coherent and squeezed states: introductory review of basic notions, properties and generalizations
• Electromagnetic properties of ${}^{21}$O for benchmarking nuclear Hamiltonians
• Uncovering the mechanism of chiral three-nucleon force in driving spin-orbit splitting
• Chiral nuclear dynamics with three-body forces
• Configuration interaction relativistic Hartree-Fock model
• Three-nucleon forces and nuclei at the extremes
• The calculation of single-nucleon energies of nuclei by considering two-body effective interaction, n(k,rho), and a Hartree-Fock inspired scheme