Ab-initio computation of neutron-rich oxygen isotopes

Abstract

We compute the binding energy of neutron-rich oxygen isotopes and employ the coupled-cluster method and chiral nucleon-nucleon interactions at next-to-next-to-next-to-leading order with two different cutoffs. We obtain rather well-converged results in model spaces consisting of up to 21 oscillator shells. For interactions with a momentum cutoff of 500 MeV, we find that 28O is stable with respect to 24O, while calculations with a momentum cutoff of 600 MeV result in a slightly unbound 28O. The theoretical error estimates due to the omission of the three-nucleon forces and the truncation of excitations beyond three-particle-three-hole clusters indicate that the stability of 28O cannot be ruled out from ab-initio calculations, and that three-nucleon forces and continuum effects play the dominant role in deciding this question.

5 pages + eps, 3 figures

References in corpus (9)

• Similarity Renormalization Group for Nucleon-Nucleon Interactions
• Structure of A=10-13 nuclei with two- plus three-nucleon interactions from chiral effective field theory
• Ab Initio Many-Body Calculations of n-3H, n-4He, p-{3,4}He, and n-10Be Scattering
• Quantum Monte Carlo calculations of neutron-alpha scattering
• Coupled-cluster theory for three-body Hamiltonians
• Medium-mass nuclei from chiral nucleon-nucleon interactions
• Solution of the center-of-mass problem in nuclear structure calculations
• Complex coupled-cluster approach to an ab-initio description of open quantum systems
• Benchmark calculations for 3H, 4He, 16O and 40Ca with ab-initio coupled-cluster theory