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We formulate the In-Medium Similarity Renormalization Group (IM-SRG) foropen-shell nuclei using a multi-reference formalism based on a generalized Wicktheorem introduced in quantum chemistry. The resulting multi-reference IM-SRG(MR-IM-SRG) is used to perform the first ab initio study of even oxygenisotopes with chiral NN and 3N Hamiltonians, from the proton to the neutrondrip lines. We obtain an excellent reproduction of experimental ground-stateenergies with quantified uncertainties, which is validated by results from theImportance-Truncated No-Core Shell Model and the Coupled Cluster method. Theagreement between conceptually different many-body approaches and experimenthighlights the predictive power of current chiral two- and three-nucleoninteractions, and establishes the MR-IM-SRG as a promising new tool for abinitio calculations of medium-mass nuclei far from shell closures.

Ab Initio Calculations of Even Oxygen Isotopes with Chiral Two- Plus Three-Nucleon Interactions